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ILLUSTRATIONS
OF THE
CROTON AQUEDUCT,

BY
F. B. TOWER
OF THE
ENGINEER DEPARTMENT.

New-York and London:
Wiley and Putnam, 1843.

Entered according to the Act of Congress, in the year 1843, by F. B. Tower, in the Clerk’s office of the District Court of the Southern District of New-York.

TO
THE INHABITANTS
OF THE
CITY OF NEW-YORK,
WHOSE ENTERPRISE IS STRIKINGLY EXEMPLIFIED
BY THE CONSTRUCTION OF THE
CROTON AQUEDUCT,
THIS BOOK
IS MOST RESPECTFULLY DEDICATED,
BY
THE AUTHOR.

PREFACE.

The views which I have given of the important points on the line of the Croton Aqueduct, are from sketches taken for my own satisfaction; but the interest so generally taken in the work, has suggested to me the propriety of presenting them to the public in this form. Having been engaged in the Engineer Department during the whole of the construction of the Aqueduct, my acquaintance with it would enable me to present more of its details; but I have given those of the construction of the Aqueduct, and a general outline of the structures connected with it, trusting that a more detailed description may emanate from John B. Jervis, Esquire, who, as Chief Engineer, gave Plans and Specifications for the work during its construction.

A description from such source, accompanied with detailed plans of all the appurtenances of the Aqueduct, with the results of experiments on the flow of water in the Aqueduct, would be a useful contribution to the cause of science, a valuable work to Engineers generally, and particularly so to younger members of the profession.

The history which I have given of the preliminary measures leading to the accomplishment of this work, has been obtained, mainly, from printed documents of the Common Council. I have also had conversations with persons who were intimately concerned in some of those measures, and trust that I have made the history sufficiently full to embrace the leading steps which were taken.

The accounts of the Aqueducts of ancient Rome, and those built by the ancient Romans in other parts of Europe, also that of the Aqueducts of modern Rome, of Italy, France, &c., have been mostly obtained from the French work of J. Rondolet, in which the account of the Aqueducts of ancient Rome is translated from the Latin of Frontinus.

For the account of the Aqueducts of Mexico and South America, I am indebted, in a great degree, to “Bradford’s Antiquities of America,” and “Ewbank’s Hydraulics.”

F. B. Tower.

TABLE OF CONTENTS.

“The radiant aqueducts

Turn their innumerable arches o’er

The spacious desert, brightening in the sun,

Proud and more proud in the august approach:

High oe’r irriguous vales, and woods, and towns,

Glide the soft whispering waters in the wind,

And here united pour their silver streams,

Among the figured rocks, in murmuring falls,

Musical ever.”

The Ruins of Rome.

INTRODUCTORY CHAPTER.
AQUEDUCTS, FOUNTAINS, ETC.

A supply of pure and wholesome water is an object so essential to the health and prosperity of a city, that it should form one of the leading features of the public improvements which characterize its growth. The advantages arising from it are so numerous, and the comforts so great, that every effort should be made to accomplish it.

The means which have been resorted to for such purposes in almost every city of importance in the Old World, are examples for us of the New, and should induce us early to avail ourselves of that important element of health. We contemplate with mingled emotions of wonder and admiration, those works of art which were achieved by ancient Rome in her palmy days of wealth and power, and among them we find that her Aqueducts hold a prominent place.

Among the ruins of cities whose history is shrouded in mystery on this continent, we find provisions for bringing water from distant sources. In the wilds of Central America, the persevering traveller finds ruined cities buried in the depths of the forest, where nature is at work covering and concealing them: among those ruins he tells us of the Aqueduct. We find them also among the ruins of cities along the western coast of South America. With such examples before us, we may consider that by the construction of the Croton Aqueduct for supplying the City of New-York with water has been secured an important measure for the promotion of its growth.

Many cities of the United States have directed their attention to this object, and some have been fortunate in finding a supply of water near at hand, but others will look towards distant sources for a supply, and will, ere long, resort to the construction of Aqueducts.

In the history of cities built in remote periods of antiquity, we find mention made of plans for supplying water, and among remains of those cities which are found at this day, are traces of Aqueducts. We have accounts of Aqueducts constructed under the reign of Solomon, and the remains of them still existing in Palestine, give evidence of an extensive acquaintance with the principles of hydraulics among the Hebrew architects. The Pools of Solomon, which are mentioned by travellers who combine in their researches a regard for the arts as well as the religion of Judea, are connected with a scheme for supplying Jerusalem with water.

The vast expense incurred in the construction of Aqueducts by the Ancient Romans, as well in Italy as in other countries of Europe, proves the value that was attached by that people to a plentiful supply of pure water, and the details of the plan of construction of the different works, evince an acquaintance with the principles of hydraulics which, at this day, is not generally accorded to them. That they understood the principle that water seeks the level of its source after encountering depressions in its conduit, is sufficiently proved by instances, in works constructed by them, where the inverted syphon of pipes was used in crossing valleys. That this plan was not generally adopted by them in cases where great expense has been incurred to maintain the uniform declivity of the conduit over valleys, may be accounted for perhaps by the want of proper material for the construction of pipes. In cases where this plan has been adopted leaden pipes were used, and since it is only within the last century that iron pipes have been invented, we may reasonably conclude that considerations of such a nature would have induced them to adopt the more expensive plan of maintaining the general inclination of the conduit by vast structures of masonry.

By substituting inverted syphons instead of maintaining a uniform declivity in the conduit, would not give the requisite discharge of water at the elevation of the terminus of the Aqueduct, and perhaps they preferred, rather than diminish this elevation of the supply of water, to incur the expense of high structures across valleys. The Roman Emperors, with all their power and the wealth which was at their command, knew how to perpetuate the glory of their reign by the erection of Temples, Palaces and other public buildings, and what is more natural than to suppose that in the construction of these Aqueducts, which were considered so essential to the public welfare, they should encourage works of such architectural magnificence? Whatever the reasons might have been for maintaining the elevation of their Aqueducts over valleys by such expensive structures, we have no right to charge them with the want of that knowledge which the plan of some of their Aqueducts clearly proves them to have possessed.

Trusting that it will be interesting to the reader, I shall present an account of some of the principal Aqueducts built by the Ancient Romans,—some of the modern Aqueducts of Italy and France; also of Aqueducts in other parts of the world. This account might be enlarged, to embrace a description of more of the modern Aqueducts of Europe; but sufficient will be presented, it is thought, to interest without detaining the reader too long in arriving at the principal object of this work,—a description of the Croton Aqueduct.

A view is given of the Aqueduct of Spoleto, in Italy. The bridge supporting this Aqueduct is remarkable for the slender form of the piers and their great height; being only ten and a half feet thick and two hundred and fifty feet high to the base of the arches. This Aqueduct was built by the Goths, a people who gave a model for Church Architecture which is much admired at the present day. It is said that they borrowed the idea of the form of their arch from the opening beneath an arbor of trees.

The plan of the bridge for the Croton Aqueduct at Harlem River has been criticised on account of the small thickness of the piers as compared with their height, and because they were not made piers of equilibrium; that is to say, having their bases broader, so as to include the line of thrust of the arches, so that if a portion of the bridge were removed, the remainder of the arches and piers would maintain their position. By the present plan the permanency of any one individual arch may be considered to depend upon that of the whole structure.[1]

The Aqueduct of Spoleto, has been standing about eleven hundred years and is still in a perfect state of preservation.

With proper care in preparing the foundations of the bridge at Harlem River, there is no good reason to fear that it will be less durable than that of Spoleto.

Aqueducts of Ancient Rome.

The largest and most magnificent Aqueducts of which we have any account, were the work of the Romans; and the ruins of several of them, both in Italy, and other countries of Europe, remain to the present time monuments of the power and industry of that enterprising people.

For 440 years from the foundation of Rome the inhabitants contented themselves with the waters of the Tiber, and of the wells and fountains in the city and its neighborhood. But at that period the number of houses and inhabitants had so augmented, that they were obliged to bring water from distant sources by means of Aqueducts. Appius commenced this scheme of improvement. About 39 years after him, M. Curius Dentatus, who was censor with Papirius Cursor, brought water from the neighborhood of the city of Tibur; and applied towards defraying the expense, part of the sums taken in the spoils of Pyrrhus. After them Lucius Papirius, Caius Servillius Cepion, Lucius Longinus Crassus, Quintus Marcius, (who brought water to Rome from a spring at the distance of nearly sixty miles,) Marcus Agrippa, Augustus, and others, signalized themselves by their noble Aqueducts. Even Tiberius, Claudius, Caligula, and Carracalla, though in other respects not of the best character, took care of the city in this useful article.

In the remains of these ancient Aqueducts, some are elevated above the ground upon a solid mass of stone work, or upon arches continued and raised one above the other; other portions are subterraneous, passing through deep excavations, and in many instances piercing through mountains of rock; such is that seen at Vicovaro beyond Tivoli, where a tunnel of about five feet deep and four broad, pierces a rock for a distance of more than a mile.

These Aqueducts were generally built of stone and covered by arches or large flat stones. At certain distances vents were provided to discharge the water from the channel-way; and cavities were formed, into which the water was precipitated, and where it remained till its mud was deposited, and ponds in which it might purify itself.

One of these Aqueducts was formed with two channels, one above the other: they were, however, constructed at different periods; the most elevated was supplied by the waters of the Tiverone, Anio novus, and the lower one by the Claudian water. It is represented by Pliny, as the most beautiful of all that had been built for the use of Rome. It was begun by Caligula, and finished by Claudius, who brought its waters from two springs called Cœruleus and Curtius. Vespian, Titus, Marcus-Aurelius, and Antonius Pius, repaired and extended it; it is now called Aqua Felice.

The Aqueduct that conveyed the Aqua Neroniana to Rome, was built of brick; this, as well as the former, was in some instances 70 Roman feet high.

The Aqueduct that brought the Aqua Marcia into the city was repaired by Agrippa, who laid pipes from it to several parts of the city.

The Aqua Marcia, Aqua Julia, Aqua Tepula, entered Rome in one and the same Aqueduct, divided into three ranges or stories; in the uppermost of which flowed the Aqua Julia, in the second the Aqua Tepula, and in the lowest the Aqua Marcia. This accounts for the extraordinary height of this Aqueduct, which far surpassed that of any other in Rome. From the ruins of this fabric, which are still seen, and are called “Il castel del Acqua Marcia,” it appears to have been a very superb structure.

The Aqueducts were under the care and direction, first of the censors and œdiles, and afterwards, of particular magistrates called “Curatores Aquarum,” instituted by Agrippa, to whom the Aqueducts of Rome were objects of particular attention. Messala was one of these curatores in the reign of Augustus, and Frontinus held the same office in that of Nerva. Augustus caused all of them to be repaired.

Procopius reckons only fourteen Aqueducts in ancient Rome; but Victor has enlarged the number to twenty.

Frontinus, a man of consular dignity, and who had the direction of the Aqueducts under the Emperor Nerva, mentions nine. From other accounts we are informed that nine great Aqueducts existed at Rome at the commencement of the reign of Nerva. Five others were constructed by that Emperor, under the superintendence of Julius Frontinus; and it appears that at a later period the number amounted to twenty.

Frontinus, who had the superintendence of the Roman Aqueducts under the Emperor Nerva, died A. D. 101. He gave an account of the Aqueducts, which has since been translated into French by Rondolet. The following table is made up of data from that work.

The table is arranged to show, First, the name of the water or Aqueduct; Second, the era of its construction; Third, the length of each Aqueduct in miles and decimals; Fourth, the cubic feet discharged in 24 hours, and Fifth, the gallons in wine measure.

Some auxiliary supplies or feeders make the total length of the Roman Aqueducts, at that period, exceed 255 miles.

The names of the Roman Aqueducts are taken from those of the River or Lake which supplies them, or from the emperors who caused them to be constructed. Frontinus gives the following as the origin of the name Virgin Aqueduct: “It is called the Virgin (Virgo), because it was a young girl who showed some veins to a few soldiers who were in search of spring water. Those who dug followed these veins and found a great quantity, and there is a painting in a little temple erected close by the source representing this event.”

Some of the principal Aqueducts constructed by the ancient Romans in other parts of Europe.

Aqueduct of Nismes.

This is probably one of the most ancient Aqueducts constructed, out of Rome, by the Romans. It is attributed to Agrippa, son-in-law of Augustus, to whom that emperor gave the government of the country becoming a Roman Colony.

Agrippa, flattered by the honors which he received from the inhabitants of Nismes, made his residence there: he enclosed the town with new walls, built baths, and probably the Aqueduct of the bridge of Gard (“pont du Gard”) for bringing water to them.

This Aqueduct is nearly thirty miles in length, forming, in its course, the figure of a horse-shoe. It brought water from the fountains of Eura and Airan, situated in the neighborhood of the town of Uzès. The bridge of Gard was about the middle part of the work, and the Aqueduct terminated at Nismes.

This Aqueduct traversed a very mountainous country, piercing through mountains and crossing valleys by means of arches upon arches, forming magnificent structures entirely of cut stone. The Aqueduct or channel-way is formed of stone throughout the whole length. The bottom of the interior has a curved form, being an arc of a circle; the sides are vertical, and the top covered with a flagging of cut stone, except where it is under ground, in which situation the top is covered by an arch of stone. The interior face of the walls and the bottom were covered with a coat of plastering two inches in thickness, composed of quick-lime, fine sand, and brick nearly pulverized. This coating has now a tenacity and consistence equal to the hardest stone.

The size of the channel-way is the following: 4 feet wide and 5⅓ feet high, except where the top is covered with an arch, in which case it is 7½ feet high in the interior.

The descent of the Aqueduct is 1 foot in 2500 feet, or 2-11/100 feet per mile.

The water which flowed in this Aqueduct formed a deposit upon the sides, of lime, until nearly half the channel was closed; this deposit amounting to a thickness of 11 inches on each side. By the height of this deposit it has been ascertained that the water flowed generally with a depth of 3¼ feet.

The pont du Gard is that part of the Aqueduct of Nismes which crosses the deep valley in which runs the Gardon or Gard. This part, considered alone, is one of the noblest monuments built by the Romans among the Gauls. It is composed of three ranges of arches one above another. The first range, under which the Gardon flows, is formed by 6 arches; the second by 11, and the third by 35, all of which are semicircular; supported upon piers of greater or less height.

The channel in which the water flows is upon the top of the third range of arches, and is 160 feet above the water of the river. The whole length of this bridge is about 900 feet.

The bridge of Gard having been broken down at the two extremities, at a period very remote and uncertain, it is thought that this destruction may be attributed to the Barbarians who invaded the country of Nismes a short time after their first invasion, which is fixed at the commencement of the fifth century, about the year 406, and it is supposed that by this means they would deprive the inhabitants of Nismes of the water furnished by the Aqueduct, and force them to yield. But by this supposition, which is very probable, the water had been running in this Aqueduct for more than four centuries; and this structure which has been out of use during fourteen hundred years, is still in such a state of preservation that it could be restored without a very great expenditure of money.

The Ancient Aqueducts of Lyons.

Nothing gives a better idea of the splendour of the city of Lyons under the reign of the first Roman Emperors, than the remains of the ancient monuments. We see there at the present day, remains of temples, of palaces, of amphitheatres, of basins for mock sea fights, of baths and of many Aqueducts, of which three were constructed under the reigns of Augustus, of Tiberius and of Claudius, for conducting water to that part of the ancient city situated upon the mountain.

The first and the most ancient of these Aqueducts, constructed by Mark Anthony, brought the waters from Mount-d’Or, by means of two branches which embraced that group of mountains.

The water furnished by the first Aqueduct having been found insufficient, they constructed a second one to bring the water of the Loire.

The third Aqueduct was built by the Emperor Claudius to furnish water to the palace of the emperors situated upon an elevated mountain. The Aqueducts built at this era are all of the same construction; that is to say, from the plan and construction adopted by the Romans. A fourth Aqueduct was also constructed for this city, but there is some doubt whether it was built by the Romans.

Aqueduct of Mount Pila.

This Aqueduct was built by Claudius, who was born at Lyons, to conduct water to the emperor’s palace, situated on the highest part of the city. The sources which supplied it, were in the neighbourhood of Mount Pila, and they were brought into the main Aqueduct by branch aqueducts. The main Aqueduct was forty miles in length; and adding the branches, the length of the Aqueduct was forty-five miles.

There were 13 bridges of stone to support the Aqueduct across valleys or over rivers, two of which were not built up to the plane of the Aqueduct, but were crossed by leaden pipes which descended on one side of the valley and, crossing the bridge, ascended on the opposite side. In another instance the pipes descended and crossed upon a wall of masonry and reached the opposite side of the valley. One instance, where pipes were used, will give an idea of their general form: the bridge was about 40 feet high and the perpendicular height of the Aqueduct above it was 140 feet. Nine leaden pipes of about 8 inches interior diameter and one inch thick were laid upon the inclined planes and across the level part of the bridge; thus communicating with the opposite crests of the valley.

These bridges which were constructed for the support of pipes, were wider in the bottom of the valley and also half way up the inclined plane, than they were for the remainder of the distance; and this form has suggested the idea that the pipes of 8 inches diameter, when they reached half way down the plane, separated, each one into two of 6 inches diameter which crossed the bridge, and converged into one again half way up the opposite plane. But it may be supposed that they continued of the same interior form throughout their length, and that this extra width was made for the purpose of giving an opportunity to fortify the pipes at the place where the pressure to which they were subjected was the greatest.

Construction.

They commenced the construction by making a trench in the ground of sufficient dimensions for the masonry of the Aqueduct: upon the bottom of this trench was laid a mass of masonry 1 foot thick, upon which two walls were built, each 1½ foot thick and 5⅓ feet high, these walls standing 2 feet apart, and surmounted by a semicircular arch of a thickness of 1 foot and generally covered with earth 2 feet deep. The interior had a coat of cement plastering, 6 inches thick on the bottom and 1½ inch thick on the sides. The walls were constructed with small stones from 3 to 6 inches in thickness, bedded in mortar so that no spaces could be found between them. They avoided the use of stones of greater thickness than 6 inches, because the walls built of small stones, well filled with mortar, formed a mass more solid and impervious than with larger stones, on account of the great quantity of mortar used.

No bricks were used in the construction of the channel-way of the Aqueduct.

Ventilators were constructed along the course of the Aqueduct 2 feet square, and rising above the ground 2 or 3 feet. The Aqueduct when it was above the ground, was supported upon a wall of masonry, and the side walls of the channel-way had an increased thickness. When it was elevated 6 or 7 feet above the ground, the foundation wall was six feet thick; but when it had a greater elevation it was supported upon arches and piers, and upon the elevation depended the span of the arch, the thickness and height of the piers. The general declivity in the channel-way, was 1 foot in 640, or about 8¼ feet per mile.

This Aqueduct supplied about 1,200,000 gallons of water in 24 hours. The velocity of the water was about five times that of the water in the Aqueducts of Rome.

This work was constructed at an immense expense, and in substituting the “inverted syphon,” for high structures across valleys, there is evidence of the intelligence and skill of those who had charge of the construction.

A fragment of a pipe forming part of this reversed syphon, is still preserved in the museum at Lyons, and an instance of the Romans having laid pipes across the beds of rivers, is given by M. Gautier, Architect, Engineer, &c., in his work called “Traité de la Construction des Chemins,” published in 1778.

About 70 or 80 years ago, he was directed by Mr. Pontchartrain, Minister of State, to repair to Rochefort, to conduct spring water to the port from the fountains of the city, which were supplied from a source, though quite insufficient for the city, in the neighborhood. In his researches he discovered a good and copious source, at less than half a league, but on the other side of the river, the Charente. Many difficulties were presented, because at low water vessels might ground upon the pipes and injure them.

However, Mr. Gautier proposed to lay down two leaden pipes, to preserve a supply in case of accident to one, and to protect them by wooden frames in an effectual way against injury, should vessels lay upon the defence frames during low water. Mr. Begon, intendant of the Marine, approved the plan, but it was finally rejected.

“Some years after,” says Mr. Gautier, “when I had charge of the roads on the Rhone, and of many other works in the Province of Languedoc, and while at Arles, I heard that a vessel had cast anchor in the Rhone, opposite the city, to take some loading; but when the commander wanted to sail again he could not raise the anchor. This fact attracted much attention, and many people went to witness the singular circumstance. The Captain, unwilling to lose his anchor, sent down a man, to find what was the matter. The diver reported that the anchor was hooked under something round, but he could not tell what it was. A capstan was applied to raise it, which succeeded.

It brought up a leaden conduit pipe from the bottom of the Rhone, which crossed it from the City of Arles, towards Trinquetaillade, over a breadth of about 90 toises (576 feet) in a depth of 6 or 7 toises (about 40 feet,) the deepest part of the Rhone. I saw some pieces of this conduit of lead, 5 or 6 inches in diameter, about 4 lines (one third of an inch) thick, in joints of 1 toise each soldered lengthwise, and covered by a strip or sheet of lead of the same thickness covering the first solder about 2 inches. The conduit was soldered at the joints, 6 feet apart, by the same material, which made a swell at that distance. On each joint were these words in relief C. CANTIUS POIHINUS. F. which was apparently the name of the maker or architect, who laid down the conduit pipe in the time of the Romans. I delayed not to inform Mr. Begon, at Rochefort, of this discovery, because he had always favoured my project of conducting water along the bottom and across the Charente, which would not have been half so difficult as it had no doubt been, to lay one across the Rhone where this was found.

Hence it may be believed, as I think now myself, that many things supposed now-a-days to be new and never to have been previously invented, may have been thought of long before, even in remote ages.” Pp. 129, 130.

Ancient Aqueduct of Metz.

This Aqueduct was built by the Romans when that city was under their dominion; but it is difficult to fix upon the precise era of its construction. It is said in the history of the city of Metz that the Roman legions built roads in the year 70; but there is reason to suppose that the construction of this Aqueduct, as well as that of other important structures built by the Romans at Metz, belongs to a time more remote, and that the date of the reign of the first emperors may be the era when the legions of Cæsar occupied the country of the Gauls.

The total length of the Aqueduct was 14 miles, and the fall for this distance was about 73 feet.

The channel-way was 6⅓ feet high, by 3 feet wide, constructed with stone masonry and having an arch over the top: the interior face of the walls and the bottom was covered with a coat of plastering; 3 inches thick in the bottom, and 2 inches on the sides. From remains of this Aqueduct which are now found at various points along its course, it appears to have required many expensive structures for crossing valleys; in one instance the Aqueduct bridge was 3,600 feet long, and the greatest height was 100 feet. In constructing the Aqueduct over these bridges, they formed it in two channels separated by a wall, and each covered with an arch; thus they insured a supply of water across the bridge by one channel in case the other required repairs.

Aqueduct of Bourgas, near Constantinople.

Three Aqueducts exist in the valley of Bourgas, 8 miles from Constantinople, for conducting water into the city. One of them is remarkable for the beautiful architectural arrangement and the solidity of its construction. It is 115 feet high, and was built under the Emperor Justinian, A. D. 527. It has two ranges of arches, one above the other, and the Aqueduct supported upon the second. These Aqueducts are in some parts unlike those of Rome, which were formed on a continuous line for many miles, with a regular inclination from the source to the city, but are interrupted by reversed syphons. Instead of crossing deep and wide valleys in the usual manner of stone structures, the Aqueduct terminates on one bank in a reservoir or cistern, and a pipe is laid from it down the sloping side of the hill to a stone pier erected at a suitable distance; the pipe rises up the pier to the top where the water is discharged into a small cistern nearly as high as that in the reservoir. From the cistern, another conduit pipe descends to the bottom of the pier, passes along the ground to a second pier at a proper distance and rises to another cistern on the top of it, and so on till it rises on the crest of the opposite bank, where the water resumes its regular motion along the Aqueduct.

This plan was probably adopted with a view to avoid the expense of constructing a bridge which should preserve the general inclination of the channel-way; but it is difficult to imagine any advantage arising from the construction of the piers, instead of laying the pipe along the bottom of the valley.

Modern Rome.

Rome is now supplied with water by three Aqueducts, being three of the ancient works restored in modern times.

First, Aqua Virgini, called by Frontinus, Aqua Virgo, or Virgin Aqueduct.

The trunk of the Aqueduct having been injured, the reparation was began under the Pontificate of Nicholas V. and Sextus IV., and completed under that of Pius IV. in 1568. This water supplies the beautiful fountain Trevi, thus named from the three discharges issuing from it, or from its being placed at the junction of three streets. The water this Aqueduct furnishes is 2,322,762 cubic feet (14,168,848 gallons) daily, discharging through 7 principal conduits, at 13 public and 37 other fountains.

Second, Aqua Felice. This is a part of the ancient water of the Claudian and Marcian Aqueducts united with many others, and collected under Sextus V. The daily quantity it furnishes is 727,161 cubic feet, (4,435,682 gallons,) and supplies 16 public and 11 other fountains. The Moses fountain discharges from this source.

The Pauline Aqueduct, called Aqua Paola, is the third of the ancient works restored. The water is collected within the territories of Arcolo and Bassano, and conducted along the ancient Aqueduct of Alsietina. This was effected under Pope Pius V., and directed by Charles Fontana, an eminent Hydraulic Architect, who constructed the great fountain of S. Pietro-in-Montorio. Additional water was also taken from Lake Bracciano by Fontana in 1694, under Clement X. The whole quantity in 24 hours is 3,325,531 cubic feet, (20,285,739 gallons,) about one third of which goes to feed the fountains of St. Peters, and those of the Pontifical Palace on the Vatican Hill; the rest is distributed among 8 public and 23 other fountains, as well as to 21 work-shops, (usines) in St. Pancras-street.

An evidence of the durability of these old Roman structures is furnished in this junction of water from Lake Bracciano by Cardinal Orsini, under authority of Clement X., upon condition that a part of the water should be used to feed a second fountain about to be built in St. Peter’s Square at Rome, and the rest to be divided between the Apostolic Chamber and the House of Orsini. From the lake the conduit leads to the old Alsietina Aqueduct, in which it flows 20 miles to the city, and it was found to be in so perfect a state when the trial was first made after the restoration, October 13th, 1693, that all the water which entered the old Aqueduct was discharged at Rome without any loss, after its use had been suspended nearly 1000 years.

The Principal Modern Aqueducts of Italy, France, Etc.

Aqueduct of Caserta.

This Aqueduct was built by the order of the King of Naples, Charles III., for conducting water to his residence which he had at Caserta, a town situated about fifteen miles north of Naples.

This Aqueduct was commenced in 1753. It is twenty-seven miles long, from the sources which supply it to the gardens of Caserta. The sources are at the base of the mountain called Taburno; the principal one is called Sorgente de la Sfizzo; it is afterwards joined by streams from many other sources, which are in the country called Airola.

These waters are all joined in one Aqueduct, crossing the river Faënza, upon a bridge of three arches, built in 1753. Again, in the valley of Durazzano, there is another bridge of three arches, upon which the Aqueduct crosses the valley, passing over the river, and extending from the mountain called Santa Agata de’Goti, to the mountain of Durazzano.

This Aqueduct afterwards crosses a deep valley, which it meets between Monte-Longano and the hills Tifata, where ancient Caserta is situated, about the place called Monte di Gazzano. The crossing of this valley required the most important of all the constructions connected with the work. It was accomplished by an Aqueduct bridge, 1724 feet long and 190 feet in height, composed of three tiers of arches, one above another. The lower range has nineteen arches, the middle twenty-seven, and the upper one forty-three; making in all eighty-nine arches.

The labor of constructions under ground for this Aqueduct was more than that above; it pierced through five hills or mountains, making an aggregate length of tunnel of about four miles, and most of this was through rock.

To give air and light to the channel, they made pits or wells; some of which were 250 feet deep, 10 feet diameter at the bottom, and 4 at the top.

Aqueduct Bridge of Castellana.

This Aqueduct was built in connection with an ancient Causeway, which led to Civita-Castellana.

This Causeway was about 820 feet long and 32 feet wide; the greatest height was about 130 feet. It was pierced in the middle of this extent, by nine large arches; three of which were 86 feet span, and the others were each 64 feet span. Above these arches of the bridge the Aqueduct is built, the height of which is about 57 feet, and it is sustained upon a series of arches of about 19 feet span each.

Aqueduct of Montpelier.

This Aqueduct is one of the most beautiful works of the kind, which exist in France. The length is about 3,200 feet; it conducts to Montpelier the waters of Saint Clement and du Boulidou. It was built by M. Pitot, engineer and member of the Academy of Sciences. He was thirteen years constructing it. This Aqueduct is formed by two ranges of arches; those in the lower tier are seventy in number, and each 28 feet span; the piers of these arches are each 12 feet thick. The arches of the second or upper tier are much smaller, and are arranged so that three of them come within the space occupied by one of the lower arches. They are 9 feet diameter; their piers are 4 feet and a quarter thick.

The greatest height of this Aqueduct is 90 feet.

It is constructed entirely of cut stone. The quantity of water furnished by it is about 300,000 gallons in twenty-four hours.

Aqueduct of Spoleto.

This Aqueduct was constructed in the year 741, by Theodoric, King of the Goths, to communicate with the town of Spoleto, situated upon the summit of a mountain. It is composed of ten grand Gothic arches each 71 feet diameter, supported upon piers of 10½ feet thickness. The middle arches which are over the river de la Morgia, are about 328 feet high.

Napoleon Gimbrede. sc.

AQUEDUCT OF SPOLETTO, ITALY.

On the top of this bridge is the Aqueduct which carries the water to Spoleto.

This structure was difficult to execute, and being built of a very hard stone, remains entire at the present day.

The total length is 800 feet, and the breadth is 44 feet.

The greatest height of this bridge is 420 feet.

Aqueduct of the Prince of Biscari.

This Aqueduct was constructed by the Prince of Biscari, in Sicily, at his own expense, across the river Saint-Paul, the ancient Symète. It conducts a pure stream of water to the estate of the prince, and at the same time serves as a public bridge over the valley. This bridge is composed of thirty-one arches, the largest of which, over the river, is 90 feet span. This arch is of Gothic form, while all the others are semi-circular. The bridge has two tiers or ranges of arches; the roadway is upon the first range, and the channel for the water, upon the second or upper range. The length of the bridge is 269 feet. The height to the top is 120 feet. It is said that this magnificent structure was accomplished in two years.

Aqueduct of Arcueil.

The Emperor Julian built this Aqueduct to bring water to Paris, A. D. 360; it supplied the palace and hot baths, but was destroyed by the Normans. It was above nine miles and a half long, and was entirely under ground, except the stone arcade over a deep valley at Arcueil. After its use had been suspended 800 years, a new and beautiful arched Aqueduct was built by the side of the ruins of the old one, and its final restoration to public use was completed in 1634.

Part of this ancient construction, consisting of two arches substantially built, still exists, near the modern Aqueduct.

The Aqueduct bridge over the valley of Arcueil has twenty-five arches, is 72 feet high and 1,200 feet in length.

In the interior of the Aqueduct on each side is a parapet which forms a walk. On the outside along the whole line are various openings, called regards.

This Aqueduct was thoroughly repaired in 1777; and fresh sums of money have lately been devoted to the same purpose by the city of Paris. It supplies 36,000 hogsheads daily.

Aqueduct of Maintenon.

This work, had it been completed, would have been one of the most remarkable of modern times. The project was one of the noblest examples of the enterprise which characterized the reign of Louis XIV., and had it been carried out would have presented a work equal in grandeur to any of the kind constructed by the Romans. It was projected by Vauban, and the work was commenced in 1684, but was abandoned in 1688.

It was intended to conduct water from the river Eura to Versailles; a distance of over seventy miles; and it was also contemplated to continue the work to St. Cloud and to Paris; had this been done it would have been over ninety miles in length. It was intended to be of a mixed construction; partly by a canal formed by excavations and embankments, and partly by a channel of masonry.

One of the most remarkable structures connected with it, was the Aqueduct bridge across the valley of Maintenon. This was designed to be entirely of masonry, having three ranges of arches, one above another. The length of this Aqueduct bridge would have been three and a quarter miles, and the height from the lowest part of the valley would have been 234 feet.

The whole number of arches designed for this bridge was 685.

Some of the piers and arches of the lower tier were constructed, but have since been suffered to crumble and fall. Many deep valleys were filled with embankments, and the canal was completed for a portion of the distance, but the course of the work is now but faintly marked by the remains of these structures.

Aqueduct of Lisbon.

The site of Lisbon, as well as the ground in its vicinity, consists chiefly of limestone and basalt, which render it necessary to obtain good water, at about three leagues distance, for the beverage, and other uses of the inhabitants. The source consists of several springs that are near to the village of Bellas, and their produce is conveyed to Lisbon by an Aqueduct, constructed of a kind of white marble, and finished in 1738. In some parts its course has been excavated through hills; but near to Lisbon it is carried over a deep valley, for a length of 2400 feet, by means of several bold arches, of which the largest has a height of about 250 feet, by a breadth of 115. The arches being pointed have an interesting aspect, particularly when viewed from below, the interior of the spacious vaults being not only majestic in appearance, but reverberating every sound. The water flows through a stone tunnel, or covered arch-way, about 8 feet wide, formed in the middle of the structure; and on each side there is a foot-path, with a parapet wall, having a sufficient width for two persons to walk. The Aqueduct enters the town on its northern side, at a place called da Amoreira, where it branches into several others, in order to supply the different fountains, from which the inhabitants are supplied. Persons, denominated gallegos, obtain a subsistence by selling the water, which they procure at the fountains in small barrels, and afterwards cry it through the streets.

Aqueducts of Mexico and the adjacent States.

The people who, in remote times, inhabited the region of Mexico, were advanced in civilization and in the arts; they had regularly organized states and established forms of government, and their immense cities, their roads, Aqueducts and other public works, give evidence of the advanced state of the arts among them and their knowledge of the sciences.

The location and great population of some of their cities required a familiar knowledge of hydraulic operations to supply them with water; and hence it would seem as if they had cultivated this department of the arts equally with others, for some of their Aqueducts were of a character that would have done honor to Greece or Rome. Nearly all the ancient cities of Mexico were supplied by them.

“The city of Mexico, which was built on several islands near the shore of the lake, was connected to the main land by four great causeways or dikes, the remains of which still exist. One of these to the south, the same by which Cortez entered, was nearly two leagues long—another to the north about one league, and the third at the west somewhat less. The fourth supported the celebrated Aqueduct of Chapoltepec, by which water was conducted from springs, upon an insulated hill of that name, at the distance of from two to three miles.”

The Aqueduct of Chapoltepec was the work of Montezuma, and also the vast stone reservoir connected with it.

This Aqueduct consisted of two conduits formed of solid mason work—each five feet high and two paces broad—by which the water was introduced into the city for the supply of various fountains.

Olid and Alvarado commenced the siege of Mexico by attempting to cut off this supply of water, an enterprise which the Mexicans endeavored to prevent. “There appeared on that side,” says De Solis, “two or three rows of pipes, made of trees hollowed, supported by an Aqueduct of lime and stone, and the enemy had cast up some trenches to cover the avenue to it. But the two captains marched out of Tacuba with most of their troops, and though they met with a very obstinate resistance, they drove the enemy from their post, and broke the pipes and Aqueduct in two or three places, and the water took its natural course into the lake.”

Humboldt says, there are still to be perceived the remains of another Aqueduct, which conducted to the city the waters of the spring of Amilco, near Churubusco. This Aqueduct, as described by Cortez, consisted of two conduits composed of clay tempered with mortar, about two paces in breadth, and raised about six feet. In one of them was conveyed a stream of excellent water, as large as the body of a man, into the centre of the city. The other was empty, so that when it became necessary to clean or repair the former, the water might be turned into it; which was the case also with those of Chapoltepec, “of which one was always in use, whenever the other required cleaning.”

The gardens of Montezuma were also adorned and nourished with streams and fountains, and appear to have rivalled those of Asiatic monarchs in splendour.

The ruins of the city of Tezcuco, which with its suburbs was even larger than Mexico, and according to Torquemada, contained one hundred and forty thousand houses, still betoken an ancient place of great importance and magnificence. Without the walls, tumuli, the sepulchres of the former inhabitants, may yet be observed, and also the remains of a fine Aqueduct in a sufficient state of preservation for present use.

Two miles from Tezcuco, the village of Huexotla, situated on the site of the ancient city of that name, which was considered as one of the suburbs of Tezcuco, exhibits signs of ancient civilization, in the foundations of large edifices, in massive Aqueducts, one of which, covered with rose-colored cement, still exists in a perfect state, and in an extensive wall of great height and thickness. A covered way flanked by parallel walls proceeds from the ancient city, to the bed of a stream now dry, over which there is a remarkable bridge, with a pointed arch 40 feet high, and supported on one side by a pyramidal mass of masonry.

Tlascala was furnished with abundance of baths and fountains, and Zempoala, like the city of Tezcuco, had every house supplied with water by a pipe.

Iztaclapa, which contained about ten thousand houses, had its Aqueduct that conveyed water from the neighboring mountains, and led it through a great number of well cultivated gardens.

Among the ruins of the city of Zacatecas, are found the remains of an Aqueduct; and at Palenque is found an Aqueduct of stone, constructed with the greatest solidity.

Among the hieroglyphical ornaments of the pyramid of Xochicalco are heads of crocodiles spouting water, and much proof may be found that the ancient Americans were acquainted with that property of liquids by which they find their level; and applied it not merely to fountains and jets d’eau, but to convey water through pipes to their dwellings.

Aqueducts of South America.

The ancient inhabitants of Peru, Chili, and other parts of South America were undoubtedly a refined, civilized and agricultural people; they constructed extensive cities, roads, Aqueducts, &c. Though they constructed many and extensive Aqueducts for the supply of towns and cities with water, yet the object of the greater part of the public works of this kind was for the encouragement of agriculture.

“The Peruvians and some of the neighboring nations carried the cultivation of the soil to a higher stage of perfection than any of the American nations. In consequence of the narrow extent of land intervening between the mountains and the sea, the rivers in this region are usually of small size, and the soil, being arid and sandy, needs the aid of artificial irrigation. To such an extent did they carry their ingenious efforts, that the sides of the steepest mountains were converted into productive fields, by being encircled with terraces, supported by stone walls, and watered by canals.”

“Upon the sides of some of the mountains,” observes Mr. Temple, “were the remains of walls built in regular stages round them, from their base to their summits, forming terraces on which, or between which, the Indians, in days of yore, cultivated their crops.”

“Frezier says the Indians were very industrious in conveying the waters of the rivers through their fields and to their dwellings, and that there were still to be seen in many places Aqueducts formed of earth and stone, and carried along the sides of hills with great labor and ingenuity.”

“I have had various opportunities,” says a recent traveller, “of closely examining one of these canals, which is formed at the source of the river Sana, on the right bank, and extends along a distance of fifteen leagues, without reckoning sinuosities, and which consequently supplied a vast population; particularly one city, whose ruins still remain in the vicinity of a farm now called Cojal.”

“These Aqueducts were often of great magnitude, executed with much skill, patience and ingenuity, and were boldly carried along the most precipitous mountains, frequently to the distance of fifteen or twenty leagues. Many of them consisted of two conduits, a short distance apart; the larger of these was for general use; the other and smaller, to supply the inhabitants and water the fields, while the first was cleansing; a circumstance in which they bear a striking resemblance to those of Mexico.”

Molina, in his “Natural and Civil History of Chili,” observes, that previous to the invasion of the Spaniards, the natives practised artificial irrigation, by conveying water from the higher grounds in canals to their fields. Herrera says, many of the vales were exceedingly populous and well cultivated, “having trenches of water.”

The Peruvians carried the system to a great extent. “How must we admire, (says Humboldt,) the industry and activity displayed by the ancient Mexicans and Peruvians in the irrigation of arid lands!

“In the maritime parts of Peru, I have seen the remains of walls, along which water was conducted for a space of from 5 to 6000 metres, from the foot of the Codilleras to the coast. The conquerors of the 16th century destroyed these Aqueducts, and that part of Peru has become, like Persia, a desert, destitute of vegetation. Such is the civilization carried by the Europeans among a people, whom they are pleased to call barbarous.” These people had laws for the protection of water, very similar to those of Greece, Rome, Egypt, and all the older nations; for those who conveyed water from the canals to their own land before their turn, were liable to arbitrary punishment.

Several of the ancient American customs respecting water, were identical with those of the oldest nations.

They buried vessels of water with the dead. The Mexicans worshipped it. The Peruvians sacrificed to rivers and fountains. The Mexicans had Tlaloc, their god of water. Holy water was kept in their temples. They practised divinations by water. The Peruvians drew their drinking water from Deep Wells, and for irrigation in times of drought, they drew it from pools, and lakes, and rivers.

There is reason to believe that Peru, Chili, and other parts of the southern continent, were inhabited by a refined, or partially refined people, centuries before the time of Manco Capac, the first Inca; and that a long period of barbarism had intervened, induced, perhaps, by revolutions similar to those which, in the old world, swept all the once celebrated nations of antiquity into oblivion. The ancient Peruvians had a tradition respecting the arrival of giants, who located themselves on the coast, and who dug wells of immense depth through the solid rock; which wells, as well as cisterns, still remain.

There is much uncertainty respecting Manco Capac. Who he was, and from what country he came, are equally unknown. According to their Quippus, or historical cords, and the opinion of the Inca, who was uncle to Garcilasso, and who communicated to the latter all the knowledge of their ancestors then extant, he made his appearance in Peru about 400 years before the invasion of the Spaniards. It is said he was whiter than the natives, and was clothed in flowing garments. Awed by his presence, they received him as a divinity, became subject to his laws, and practised the arts he introduced. He founded Cusco, and extended his influence to all the nations around. He taught them agriculture and many useful arts, especially that of irrigating land. His son succeeded him, and without violence greatly extended the limits of the kingdom; prevailing with the natives, it is said, by a peaceable and gentle manner, “to plough, and manure, and cultivate the soil.” His successors pursued the same mode, and with the same success. The fifth Inca, we are informed, constructed Aqueducts, bridges and roads in all the countries he subdued. When the sixth Inca acquired a new province, he ordered the lands to be “dressed and manured;” the fens to be drained, “for in that art (draining) they were excellent, as is apparent by their works, which remain to this day; and also they were (then) very ingenious in making Aqueducts for carrying water into dry and scorched lands, such as the greatest part of that country is; they always made contrivances and inventions to bring their water. These Aqueducts, though they were ruined after the Spaniards came in, yet several reliques and monuments of them remain unto this day.”

The seventh Inca, Viracocha, constructed some water works, which, in their beneficial effects, perhaps equalled any similar undertakings in any other part of the world. “He made an Aqueduct 12 feet in depth, and 120 leagues in length; the source or head of it arose from certain springs on the top of a high mountain between Parcu and Picuy, which was so plentiful that at the very head of the fountains they seemed to be rivers. This current of water had its course through all the country of the Rucanas, and served to water the pasturage of those uninhabited lands, which are about 18 leagues in breadth, watering almost the whole country of Peru.”

There is another Aqueduct much like this, which traverses the whole province of Cuntisuyu, running above 150 leagues from south to north. Its head or original is from the top of high mountains, the which waters falling into the plains of the Quechuas, greatly refresh their pasturage, when the heats of the summer and autumn have dried up the moisture of the earth.

“There are many streams of like nature, which run through divers parts of the empire, which being conveyed by Aqueducts, at the charge and expense of the Incas, are works of grandeur and ostentation, and which recommend the magnificence of the Incas to all posterity; for these Aqueducts may well be compared to the miraculous fabrics which have been the works of mighty princes, who have left their prodigious monuments of ostentation to be admired by future ages; for, indeed, we ought to consider that these waters had their source and beginning from vast, high mountains, and were carried over craggy rocks and inaccessible passages; and to make these ways plain, they had no help of instruments forged of steel or iron, such as pickaxes or sledges, but served themselves only with one stone to break another. Nor were they acquainted with the invention of arches, to convey the water on the level from one precipice to the other, but traced round the mountain until they found ways and passages at the same height and level with the head of the springs.”

“The cisterns or conservatories which they made for these waters, at the top of the mountain, were about 12 feet deep; the passage was broken through the rocks, and channels made of hewn stone, of about two yards long and about a yard high; which were cemented together, and rammed in with earth so hard, that no water would pass between, to weaken or vent itself by the holes of the channel.

“The current of water which passes through all the division of Cuntisuyu I have seen in the province of Quechua, which is part of that division, and considered it an extraordinary work, and indeed surpassing the description and report which hath been made of it. But the Spaniards who were aliens and strangers, little regarded the convenience of these works, either to serve themselves in the use of them, or to keep them in repair, nor yet to take so much notice of them as to mention them in their histories, but rather out of a scornful and disdaining humor, have suffered them to run into ruin, beyond all recovery. The same fate hath befallen the Aqueducts which the Indians made for watering their corn lands, of which two thirds at least are wholly destroyed, and none kept in repair, unless some few which are so useful that without them they cannot sustain themselves with bread, nor with the necessary provisions of life. All which works are not so totally destroyed but that there still remain some ruins and appearances of them.”

In describing the temple and gardens at Cusco. Garcilasso observes, “there were five fountains of water, which ran from divers places through pipes of gold. The cisterns were some of stone, and others of gold and silver in which they washed their sacrifices, as the solemnity of the festival required.”

Fountains.

Artificial fountains and jets d’eau are of extreme antiquity; they have been used for beautifying public grounds of cities, and have served the purpose of moderating the temperature of the air; in these cases the water has been in some instances perfumed.

“From excavations made at Pompeii it appears that in almost every street there was a fountain, and that bronze statues, through which the water issued were common,—several have been found,—four or five are boys of beautiful workmanship; the fluid issued from vases resting on their shoulders, or held under their arms, and in some cases from masks. Paintings of elegant fountains, from which the water issued in perpendicular jets, have also been discovered both at Herculaneum and Pompeii.”

“In the middle of the square of the Coliseum, is a pretty remarkable piece of antiquity, (says Blainville,) though very little minded by most people. Here stood anciently, a beautiful fountain, adorned with the finest marbles and columns; and on the top was a bronze statue of Jupiter, from which issued great plenty of water, as may be seen on the reverse of one of Titus’ medals. This fountain was of great use both to the spectators and the gladiators in the amphitheatre to refresh themselves. Pope Alexander VII. caused it to be repaired, but since his time it has been entirely neglected.”

“During hot weather, Augustus the Roman Emperor slept (observes Sentonius) with his chamber doors open, ‘and frequently in a portico with waters playing around him.’”

The garden water-works of the Duke of Devonshire at Chatsworth are probably the finest in England; being ornamented by many fanciful devices and from a jet of six inches diameter the water rises perpendicularly to the height of 90 feet.

The most remarkable fountain or jet d’eau in the world, is at Cassal in Germany, where the water rises from an orifice of 12 inches diameter to a perpendicular height of 250 feet. The source from which it is supplied is at the top of a mountain near by, being about 500 feet above the level of the town. The surplus water not used for the supply of the fountain flows down the mountain-side forming a beautiful cascade.

The cities of Europe abound in fountains which in their arrangement furnish beautiful designs and are ornamented with specimens of workmanship displaying much skill and refinement of taste: a minute description of them would, however, occupy too much space, and since we have had our attention drawn (on the subject of Aqueducts) more particularly to the works of the Romans, we will revert to the

Fountains of Rome.

“If during the most distinguished eras of the Roman state, the Aqueducts conduced to the luxurious enjoyments of the wealthy and powerful, yet in modern times, the residents of Rome have also found them particularly advantageous, by their furnishing occasions for the cultivation of those elegant arts, which, in a peculiar manner, call forth the energies of genius, and the exercise of refined taste, in realizing and decorating her productions. Qualities of this kind appear conspicuous in several of the numerous fountains which adorn that celebrated city; and the most intellectual and accomplished professors of sculpture and architecture, have happily united beauty and grandeur in the construction of many such admirable edifices. These structures are also characterized by great diversity of design, as well as skilful execution; hence, a concise description of several of them may be interesting.”

“The largest structure of this kind in Rome, is that denominated the Pauline Fountain, which was built by order of Pope Paul V., with the materials of Nerva’s Forum. This spacious edifice is situate on the highest part of the Janiculum hill, and Dominica Fontana, and Carlo Mederno, furnished the designs for its construction. The front is adorned with six Ionic columns of red granite, on which an attic has a tablet containing an inscription with the pontiff’s arms placed above it. Between the columns the spaces are open, and from these arcades the currents of water flow with a loud noise, and in great abundance. The apertures on the sides are smaller than the others, and in each of those is placed a dragon spouting water into the spacious magnificent marble basin below. This fountain is furnished with water by the Aqueduct called Aqua Paolo; and it runs from the basin, in a very large stream into several canals, whence it is employed to work various corn, paper, and other mills, as well as to supply fountains and fish-ponds in the gardens and palaces of the opulent.”

“Near to the baths of Dioclesian, and in the square of the Termini, stands the fountain of the Aqua Felice. The edifice is not only elegant but fanciful, and it has three arcades ornamented with four Ionic columns of granite. The middle arcade has a colossal statue of Moses, causing the water to issue from the rock; and at the sides are two basso relievos, one representing Aaron leading the Israelites to the miraculous spring, and the other Gideon selecting the soldiers to enlarge the passage for the water, which flows in great abundance through three apertures into marble basins. The sides are adorned by four marble lions, with the water issuing from their mouths: two of these are formed of white Grecian marble, and the other two of black granite. The latter are Egyptian workmanship, and covered with hieroglyphics. This noble fountain was erected from a design of Cav. Fontana; by the order of Pope Sixtus V., and its supply of water is obtained twenty-two miles from the city.”

“Another of these fine structures is that called the Fountain of Trevi, in which boldness of design, and elegance of architecture are admirably united. The erection of this very magnificent edifice commenced during the pontificate of Clement XII., who repaired the Aqueducts. Niccolo Salvi designed the grand front, but the work was completed under Clement XIII., who decorated it with statues, basso relievos in marble, and different columns of the Corinthian, Ionic, and Composite orders. In the centre is a statue representing Oceanus, standing in a car, drawn by two large sea-horses, guided by Tritons. One of the horses appears furious and impatient, whilst, on the contrary, the other is exhibited as calm and placid, so that both are symbolical of the tempestuous or tranquil state of the sea.

‘Bounding to light, as if from ocean’s cave,

The struggling sea-horse paws the lucid wave,

While health and plenty smile, and Neptune’s form

Majestic sways the trident of the storm.’

“A statue, designating Abundance, is placed at the right of Oceanus, and on the left another emblematical of Health. The basso relievo, which adorns the right side, portrays the Emperor Trajan, contemplating a plan of the fountain; and that on the left exhibits a girl showing to some soldiers, the spring that supplies it with water. Various other sculptures decorate this superb edifice; and at the top of the principal front are two figures of Fame, supporting the arms of the Pope. Its supply of water is furnished by the Aqua Virgini, and it flows in very large streams from three arcades. The cost of constructing this splendid and useful fountain was great; but it ranks among the most interesting objects conspicuously embellishing the city of Rome.”

“The Piazza Novana has a very noble fountain standing in its centre. It is composed of a large circular marble basin 79 feet in diameter, in the middle of which is placed a rock of square form with apertures at the sides. The figure of a lion adorns one side, and that of a sea-horse another. From the base to the top of the rock, the height is about 14 feet; and on its summit stands an Egyptian obelisk formed of red granite, 55 feet in height, and covered with hieroglyphics. At the four sides of the rock are colossal marble statues, which designate the four great rivers in different quarters of the world: viz. the Danube, the Nile, the Ganges, and the Plata: and from these statues the water flows in copious streams to the spacious basin below.

‘The Nile and Ganges from the silver tide:

La Plata too, and Danube’s streams unite

Their liquid treasures, copious, clear and bright.’

“During the summer, it is the custom occasionally to permit the water to overflow the whole square, for the entertainment of the people; and on midsummer’s eve persons amuse themselves by wading and driving through the flood. This practice has sometimes been attended with fatal accidents, and not only men but horses have actually been drowned in the attempts to pass it in carriages.

“In the month of August the area of the square is likewise filled with water for the purpose of amusement.

“The same square likewise contains two other fountains, one of which consists of a capacious marble basin, having at its centre a Triton holding a dolphin by the tail; and on the margin of the basin are four heads with the same number of Tritons that spout the water from their mouths. The other fountain has not any remarkable characteristics to entitle it to peculiar attention.”

“Where formerly stood the circus of Flora is now the site of the Piazza Barberinni, which has two fountains to embellish it:—one of them being composed of four dolphins supporting a large open shell, with a Triton in the middle ejecting water to a great height. The other is fanciful, being also formed of an open shell, from which three bees throw out the water.”

“In the vicinity of the Temple of Vesta stands a handsome fountain, having a capacious basin, in which some Tritons support a large marble shell. From the centre of the latter, the water spouts to a considerable height, and then descending flows over its margin into the basin beneath. Some fine fountains adorn the magnificent colonnade in front of the Cathedral of St. Peter. The Piazza di Spagna has likewise for its embellishment, a fountain in the form of an antique boat. Besides the structures described above, there is a great number of other fountains which evince much diversity of taste and ingenuity in their contrivance. But at the different villas of the opulent, the abundance of water is rendered subservient to amusing as well as useful purposes, and several of them are rather singular. The description of one will convey some notion of what is common to many of them.

“The delightful promenades, groves, and gardens belonging to the Doria family, are interspersed with fountains of various forms; besides having a beautiful lake with waterfalls. Statues, antique basso relievos, and small fountains, adorn a kind of amphitheatre, where a circular edifice contains the marble figure of a fawn holding a flute, on which it seems to play different airs: the music, however, is produced by a machine resembling an organ in its construction, and motion being given to it by the flowing of the water from a cascade.”

“Perhaps the few instances recited above will suffice to demonstrate the different modes employed at Rome, for calling into exercise genius, fancy, and taste, to diversify the public edifices concerned with its abundant supply of water; thus rendering them subservient to magnificence, entertainment, and utility. Whilst John Dyer resided there, he viewed these celebrated fountains with the mingled feelings of the painter and the poet; hence, associating them with other interesting circumstances, they furnished the materials for one of his most striking and pathetic delineations.

‘The pilgrim oft,

At dead of night, ’mid his oraison hears

Aghast the voice of Time, disparting towers,

Tumbling all precipitate, down-dashed,

Rattling around, loud thundering to the moon;

While murmurs sooth each awful interval

Of ever-falling waters; shrouded Nile,

Eridanus, and Tiber with his twins,

And palmy Euphrates; they with dropping locks

Hang o’er their urns, and mournfully among

The plantive echoing ruins, pour their streams.’”

Ruins of Rome.

HISTORY
OF THE
PROGRESSIVE MEASURES FOR SUPPLYING
THE
CITY OF NEW-YORK WITH WATER.

As early as 1774, when the population of the city of New-York was only twenty-two thousand, the Corporation commenced the construction of a reservoir and other works for supplying water; and for the purpose of defraying the expense of the undertaking, issued a paper money, amounting to two thousand five hundred pounds, under the denomination of “Water Works Money,” and bonds were executed in favor of certain individuals for land and materials to the amount of eight thousand eight hundred and fifty pounds more.

A spacious reservoir was constructed on the east line of Broadway, between, what is now known as Pearl and White streets, and a well of large dimensions was sunk in the vicinity of the Collect. The war of the revolution, which commenced in 1775, and the consequent occupation of the city of New-York by the British troops, was the cause of the abandonment of the work in its unfinished state.

In the year 1798, Doctor Joseph Brown addressed a communication to the Common Council, strongly recommending the Bronx River as a source from which to obtain a supply of good water for the use of the citizens. This recommendation induced the Common Council to employ William Weston, Esquire, a Civil Engineer, to examine the subject, and he reported on the 16th of March, 1799, in favor of the practicability of introducing the water of the Bronx into the city. Neither of these gentlemen had used levels or made any survey of the country over which the water should be brought, nor was there any measurement obtained of the flow of the stream; consequently, their opinion was only founded on personal view, gained by walking over the ground.

In April, 1799, the Manhattan Company was incorporated by an act of the Legislature, and the object of this Company was declared to be, to supply the city with pure and wholesome water; but instead of looking for a supply from foreign sources, they resorted to the plan of furnishing the water from wells which they sunk within the city limits. Besides these wells of the Manhattan Company there were others subsequently sunk by the Corporation of the city, as well as by individual enterprise. Some of these wells were of great depth and capacity, having, in some instances, horizontal excavations at a considerable depth below the surface, branching off from the main shaft. Efforts of this kind, however, proved unsatisfactory, and much solicitude was felt by the citizens on account of the scarcity of pure water.

On the 17th of March, 1822, the Mayor among other measures suggested by him to the Common Council, brought to their consideration, the important question of supplying the city with pure and wholesome water, and requested its reference to a Committee, which was accordingly done. The Committee, of which the Mayor was one, proceeded to the principal source of the Bronx River, in the county of Westchester, known as the Rye Pond. They spent two days, the 20th and 21st of March, in exploring the country adjacent to the River and Sound, and at a meeting of the Common Council, on the first of April, the Mayor, as Chairman of the Committee, made a report of their observations, and recommended an appropriation, with authority to employ a competent engineer to survey and profile the whole line between the city and the main source of the river Bronx, and to ascertain the quantity of water it would afford, and an estimate of the probable cost of completing the project of supplying the city with good and wholesome water from the aforesaid source. The recommendation was concurred in, and the Mayor employed Canvas White, Esquire, a Civil Engineer, to make the said survey and estimate.

The yellow fever prevailed in the city during the summer of 1822, and shortly after the termination of the epidemic, on the 25th of November, the Mayor, in a communication to the Common Council, on subjects relative to the preservation of the public health, stated that a very important subject connected with the health of the city, was a sufficient supply of good water; and that on this subject all had been done that it was practicable, under existing circumstances, to perform; that arrangements had been made with Mr. White, a Civil Engineer of repute, to examine the several sources from which a supply was likely to be obtained, and to furnish correct surveys and profiles of the heights and depressions of the country through which the water must be conveyed, and that he had been requested to report as soon as it was practicable.

In 1823, the Sharon Canal Company was chartered by the State, and among its duties was that of supplying the city of New-York with pure and wholesome water. The work was not, however, undertaken.

In January, 1824, Mr. White made his report, which he prefaced as follows:—“That he had the honor of receiving a request from Stephen Allen, late Mayor, to make an examination and estimate of the expense of furnishing the city with a copious supply of good and wholesome water. Agreeably to that request, I have made the necessary surveys, levels and examinations to ascertain the practicability of the project,” &c. &c. At the same date, Benjamin Wright, Esq., reported to the Common Council on the same subject, which he prefaces as follows:—“In obedience to a request of your honorable body, communicated to me by Stephen Allen, Esq., late Mayor, in November last, desiring me to assist Canvas White, Esq., with my advice and counsel, as to the best method of supplying the city of New-York with plenty of good water, I beg leave to make the following report,” &c.

Mr. White reported in favor of bringing the water of the Bronx to the city; taking it from the River at the Westchester Cotton Factory pond. The natural flow of the River at this place, he stated to be 3,000,000 of gallons per day, in the driest season, and he proposed by artificial works at the upper Rye pond, and by lowering the outlet of this pond, to obtain 3,600,000 gallons more per day; thus furnishing a daily supply of 6,600,000 gallons. The cost of bringing the water to a reservoir near the Park, was estimated at $1,949,542. Mr. Wright concurred with him in this opinion.

In 1825 a company was incorporated by the Legislature, and called the “New-York Water Works Company,” with authority to supply the city with pure water. Canvas White, Esq., was appointed Engineer to this Company, and in his report to the Directors, he recommended taking the waters of the Bronx at Underhill’s bridge; estimated that 9,100,000 gallons of water could be delivered in the city daily, and that the expense would not exceed $1,450,000.

The charter of this company proved so defective in practice, that they were unable to proceed under it, and they accordingly applied to the Legislature in 1826 for an amendment, authorizing the company to take such of the waters, land and materials, by appraisement of indifferent persons, as might be required for the work. In this application, however, they were defeated, by the opposition of the Sharon Canal Company, who claimed, under their charter, all the water on the route of their canal. The Water Works Company was accordingly dissolved in 1827.

In 1831, the Common Council of the city, impelled by a sense of the importance of a supply of pure and wholesome water, began to take more decided steps towards the accomplishment of the object: a Committee of the Board of Aldermen on Fire and Water, consisting of James Palmer, Samuel Stevens and William Scott, to whom were referred various communications and resolutions on the subject of supplying the city with water, presented a report adducing facts and arguments sufficient to prove the practicability of the project and the ability of the Corporation to meet the expense; and prefaced that report as follows:—“That they approach the subject as one of vast magnitude and importance to an already numerous and dense population, requiring our municipal authorities no longer to satisfy themselves with speeches, reports and surveys, but actually to raise the means and strike the spade into the ground, as a commencement of this all important undertaking.”[2]

Their attention was drawn, at that time, to the Bronx River, with the ponds at its head, as the source for supply; but appended to their report is a letter directed to the Corporation and signed Cyrus Swan, “who is President of the New-York and Sharon Canal Company,” in which it is asserted, “it has been ascertained that that River (the Croton) can be carried into the city of New-York, and that without it, a supply which shall be adequate to the present and future wants of the city cannot be obtained.

This Committee drafted an Act for the Legislature to pass, which was approved by the Common Council, and presented to the Legislature in the session of 1832, but failed in becoming a law. That Act provided for the appointment of a Board of Commissioners of three persons, by the Common Council, to superintend the execution of the plan and make contracts for introducing water into the city of New-York.

In November, 1832, a report was made by Timothy Dewey and William Serrell to Benjamin Wright, Esq. They had examined the sources of the Bronx River and other streams, and the practicability of introducing the water of the Croton by connecting it with the Sawmill and Bronx Rivers;—they did not consider it possible to bring the Croton water to mingle with those of the aforesaid rivers without the aid of expensive machinery, from the great height it would be necessary to elevate the water. They finally recommended the Bronx as a sufficient source, with some artificial reservoirs, to answer all the city purposes.

The frightful ravages of the cholera, during the summer of 1832, gave to the subject of a supply of pure water a deeper interest, and the minds of the citizens were again aroused to the importance of it. The Committee of the Board of Aldermen, on “Fire and Water,” James Palmer, chairman, pursued the subject with energy; exhibiting on all occasions perseverance and industry in their researches.

Myndert Van Schaick, Esq., being a member of the Board of Aldermen at that time, was familiar with the question of a supply of pure and wholesome water, and holding the situation of Treasurer of the Board of Health, became deeply interested in the measure, and urged it as a matter of the deepest importance to the permanence, welfare and financial interests of the city, that every method should be taken to investigate and probe the subject which cautious men could adopt, and his efforts in the subsequent measures and provisions of law in relation to it are of the same character.

In December, 1832, De Witt Clinton, Esq., of the United States Corps of Engineers, made a report pursuant to a request of the Committee on Fire and Water, in which, after stating the substance of the several reports in favor of the Bronx as the source of supply, he arrives at the conclusion, that an adequate supply can only be obtained from the Croton River.

He proposed to take the waters of the Croton at Pine’s bridge, which he stated to be 183 feet above the level of the Hudson; to conduct the water in an open Aqueduct, following the line of the Croton and Hudson Rivers, and cross Harlem River on an arch of 138 feet in height, and 1,000 feet in length. The whole cost he estimated at $2,500,000.

It does not appear, however, that any levels were run, or survey made by Mr. Clinton, of the route he recommended; but, that he depended on the information of others, together with his personal observation, for the subject matter of his report.

In a report made to the Board of Aldermen in January, 1833, it was suggested that the failure of the law asked for the year previous, was in consequence of a want of sufficient information to warrant the opinion of the feasibility of the project, and it recommended that immediate application should be made to the Legislature, asking for the appointment of a Board of Commissioners, with full powers to examine all the plans proposed, to cause surveys, and to estimate the probable expense of supplying the city of New-York with water.

The Committee recommended that the Commissioners should be appointed by the Governor and Senate, and that their number should consist of five, “inasmuch as the object of their appointment is to settle conclusively the plan to be adopted, and the amount requisite for its performance.” This report was concurred in by the Board of Assistants, and approved of by the Mayor, January 17th, 1833.

In compliance with the request of the Common Council the Legislature of the State, on the 26th of February, 1833, passed an Act,[3] providing for the appointment by the Governor and Senate, of five persons, as Water Commissioners, whose duty it was by said Act declared to be “to examine and consider all matters relative to supplying the city of New-York with a sufficient quantity of pure and wholesome water for the use of its inhabitants, and the amount of money necessary to effect that object.”

In pursuance of this law, the Governor and Senate appointed the Board of Water Commissioners, consisting of the following named gentlemen:—Stephen Allen, William W. Fox, Saul Alley, Charles Dusenberry and Benjamin M. Brown. They were directed to make their report to the Legislature, by the second Monday of January, 1834, and to present a copy thereof to the Common Council of the City of New-York on or before the first day of November, 1833.

The Commissioners proceeded in the discharge of their duties, employed as Engineers Canvas White, Esquire, and Major D. B. Douglass, of the United States Corps of Engineers, and made all necessary examinations so as to determine, whether a sufficient quantity of pure and wholesome water could be obtained for present and future purposes, whether its introduction into the city would be practicable at an elevation precluding the use of machinery, and also what would be the probable cost of completing the projected work. Their report satisfied the Legislature that a supply of pure and wholesome water was of great importance to the city—that its introduction was feasible, and that the expense was within the financial ability of the citizens. Accordingly an Act[4] was passed by the Legislature, on the 2d of May, 1834, which provided for the appointment of five Water Commissioners by the Governor and Senate, and they were required “to examine and consider all matters relative to supplying the city of New-York with a sufficient quantity of pure and wholesome water; to adopt such plan as in their opinion will be most advantageous for securing such supply, and to report a full statement and description of the plan adopted by them; to ascertain, as near as may be, what amount of money may be necessary to carry the same into effect; to report an estimate of the probable amount of revenue that will accrue to the city, upon the completion of the work, and the reasons and calculations upon which their opinion and estimates may be founded; such report to be made and presented to the Common Council of the city on or before the first day of January, 1836.”

It was further provided, that “in case the plan adopted by the Commissioners shall be approved by the Common Council, they shall submit it to the electors to express their assent or refusal to allow the Common Council, to instruct the Commissioners to proceed in the work.”

The Commissioners who were appointed in 1833, were re-appointed under the Act of the 2d of May, 1834. They immediately entered upon the duties of their office, thoroughly re-examined their former work, and decided that the Croton River was the only source that would furnish an adequate supply of water for present and future purposes. In making these examinations they employed, as Engineers, David B. Douglass, John Martineau and George W. Cartwright, Esquires. Various plans were proposed for conveying the water to the city, and estimates made of the cost of the work constructed by either of these plans, but the one recommended by the Commissioners, and that for which a preference was expressed by the Engineers, Messrs. Martineau and Douglass, was a closed Aqueduct of masonry. These gentlemen each made an estimate of the cost of bringing the water of the Croton River to the city of New-York by a closed Aqueduct of masonry, and the Water Commissioners offered, as the true cost of the work, an average of the two estimates. The cost of the work, as estimated for this plan and presented by the Water Commissioners, (including the cost of the city mains and conduits,) was $5,412,336.72.

The report of the Water Commissioners was referred to a Committee, who reported to the Common Council, on the 4th of March, 1835, two resolutions, the first approving the plan adopted by the Commissioners as described in their report; and the second referring the subject to the electors at the ensuing annual election, as required by the Act of May 2d, 1834. These resolutions were adopted by the Common Council, and at the election in April, 1835, the subject having been duly submitted to the electors of the city and county of New-York, a majority of the voters were found to be in favor of the measure. On the 7th of May following, the Common Council “instructed the Commissioners to proceed with the work.”

Thus authorized, the Commissioners immediately commenced the preparatory measures for the construction of the work. David B. Douglass was employed as Chief Engineer; he proceeded in the location of the line for the Aqueduct and in preparing plans, until October, 1836, when he was succeeded by John B. Jervis, who continued at the head of that department during the construction of the Aqueduct.

The construction of the work was commenced in May 1837; and on the 22d June, 1842, the Aqueduct received the water from the Fountain Reservoir on the Croton:—on the 27th of June, the water having been permitted to traverse the entire length of the Aqueduct, entered the Receiving Reservoir at the city of New-York, and was admitted into the Distributing Reservoir on the 4th of July.

The Commissioners who were appointed in 1833, and re-appointed in 1834, continued in the performance of their duties until 1837—in March, of which year Thomas T. Woodruff was appointed in the place of Benjamin M. Brown, who resigned his office, and the Board of Commissioners thus constituted, continued until March, 1840, when they were succeeded by Samuel Stevens, John D. Ward, Zebedee Ring, Benjamin Birdsall and Samuel R. Childs. This Board of Commissioners remained in office until February, 1843, when they were succeeded by the gentlemen who composed the former Board.

OF PLANS PROPOSED FOR FURNISHING THE CITY WITH WATER, AND OF THE PLAN ADOPTED.

In the course of examinations which were made to determine sources whence water could be obtained, questions of deep importance presented themselves in regard to the source to be relied upon for a supply, also in reference to the plan which should be adopted for conducting the water to the city.

It was of so much importance to the city that the supply should be such as not only to answer the present purposes, but be adequate to the future increased demands, and that the quality of the water should be unquestionable, that it became necessary to extend the examinations over every watered district in the vicinity, in order to judge of the comparative merits of different sources. The Engineers who were employed, traversed the country, gauged the streams, reported their supply, the quality of the water, and plans which might be adopted for conveying it to the city. It was a field for the exercise of the talent and research of the Engineer: in resorting to a distant stream for a supply, any plan which he might propose for conveying the water, would encounter obstacles requiring skill and ingenuity to overcome. He would find it necessary to build up the valleys, pierce through the hills, and span the waters of the arms of the sea which embrace the city and make it an island. Structures would be required, which, in their design, would find no parallel among the public works of this country, and in forming plans for them he might study with advantage, the works constructed for similar purposes by the Ancient Romans.

The examinations embraced all the sources from which a supply of water might be obtained in the neighboring counties of Westchester and Putnam; giving a comparison of the different streams in regard to their elevation, their capacity, and the quality of the water. It was decided that the Croton River would supply a sufficient quantity of water at all seasons of the year; at an elevation precluding the use of steam or any other extraneous power, and that the quality of the water was unexceptionable. Other streams were found which would furnish water equally pure, but too limited in quantity at certain seasons of the year, and not at a sufficient elevation.

In addition to the information furnished by the Engineers employed, the Water Commissioners received communications from other sources suggesting plans for supplying the city with water.

It was suggested that water might be obtained from the Passaic Falls, at a distance of about eighteen miles from the city, in New-Jersey. The objections to this project were, that it would be going into another state, that an Aqueduct bridge over the Hudson River would obstruct its navigation, and iron pipes laid across the bed of the river would be exposed to injury from the anchors of the shipping. Another plan was proposed which contemplated a permanent dam across the Hudson River extending from the city to the Jersey shore. This dam was proposed to be built about 2 feet above the level of high tide, thereby keeping all the salt water below; and above the dam would be the fresh water for supplying the city, which must be pumped up into a reservoir by means of water-wheels, which would be operated by the overfall of water when the tide was low, but when the tide was up within 2 feet of the top of the dam there would not be sufficient fall to propel the wheels. Locks were to be inserted in the dam, of a sufficient number to accommodate the vessels on the river. The river, at the place where it was proposed to locate the dam, is over a mile in width, and in the channel the depth below the surface to proper foundation for such a structure, would probably be 50 feet. The difference of tides is about 5 feet, which added to the height of dam above high tides, would give 7 feet of the top of the dam exposed to the pressure of the water on the up stream side when the tide is low.

It was suggested that the hydraulic power here obtained, could be used for manufacturing purposes, except that portion of it which would be required for elevating the water to the reservoir. This plan of supplying the city with water was objected to, because it could not be accomplished except by an Act of the Legislature of New-Jersey as well as that of New-York, and it was also questionable whether such obstructions could be placed in navigable rivers without interfering with the powers of Congress to regulate the commerce of the nation. It was feared that in locking vessels through, the salt water would become mingled with the fresh above the dam where a supply would be taken for the city, to such a degree, that it would render it unfit for domestic use. The quantity of land that would be overflowed by the water set back by the dam, presented another objection. The space of time that the tide would be sufficiently low to allow the wheels to work in pumping water into the reservoir, would be entirely too short to insure a supply. This objection was offered by Frederick Graff, Esq., the superintendent of the Philadelphia Water Works, who stated that although the dam on the Schuylkill River is raised 6 feet 6 inches above the highest tides, the delay in pumping, occasioned by the tides, averages seven hours out of the twenty-four; and in full moon tides, from eight to nine hours.

The projector of this plan set forth many advantages which he thought would arise from the construction of the dam, but the obstruction to the navigation of the river, the destruction of the shad fishery, and various objections besides those already mentioned, induced the Water Commissioners to reject the idea of building a dam across the Hudson.

We have now gone over most of the preliminary steps which were taken before deciding upon the source for a supply of water.—Having fixed upon the Croton River as a stream possessing the requisite advantages for a supply, questions naturally arose as to the manner in which it should be conveyed to the city. The distance being about forty miles, over a country extremely broken and uneven, and following a direction, for a portion of this distance, parallel with the Hudson River, encountering the streams which empty into it and form deep valleys in their courses. It will be interesting to notice the different plans which were suggested for forming a channel-way to conduct the water. The following modes were presented:—a plain channel formed of earth, like the ordinary construction of a canal feeder:—an open channel, protected against the action of the current by masonry:—an arched culvert or conduit, composed essentially of masonry; and iron pipes. In deciding which of these modes should be adopted, it was necessary to make a comparison among them as to their efficiency for conducting the water in purity, and in the quantity required, their permanency as structures, and their cost.

The disadvantages attendant upon an open canal were, that by filtration through the banks there would be a heavy loss of water;—the difficulty of preserving the water from receiving the wash of the country, and preventing injurious matter from being thrown into it and rendering it impure, and the impurities which might be contracted by passing through different earths. Evaporation would also occasion a serious loss of water. The banks would be liable to failure in seasons of long-continued rains, and the city depending upon this for a supply, would be cut off, except there should be sufficient in the reservoirs to furnish a supply during the period of repairs. The canal could never be subjected to a thorough repair, because of the necessity of keeping it in a condition for furnishing water constantly during the whole year, so that all repairs would be done under great disadvantages, and the channel would be yearly growing worse until its failure might become a public calamity. In regard to the open channel having the sides protected by masonry, the objections were found to be such as would apply equally to every species of open channel; namely, that it would be exposed in many situations to receive the wash of the country; that it would be unprotected from the frost, and liable to be interrupted thereby, and lastly, that there would be a loss by evaporation. It was supposed that these objections might be obviated by certain precautions; for example, the wash could be avoided by making sufficient side drains; and the interruption liable to occur from frost and snow, and the evaporation, to a certain extent, could be prevented by closing the channel entirely with a roof over the top. The close channel or culvert, composed essentially of masonry seemed to possess all the requisite advantages for conducting the water in a pure state and keeping it beyond the influence of frost or any interruption which would be liable to occur to an open channel. In point of stability this plan had a decided preference over either of the other plans proposed, and the only objection offered was the cost of the work constructed in this way. To avoid too great expense it was proposed to make use of a mixed construction, using the close channel or culvert in situations where deep excavations occurred and it would be desirable to fill in the earth again to the natural form, also where the line of Aqueduct intersected villages, and using the open channel with slope walls for the residue of the distance.

In regard to iron pipes for conducting the water, it was found that a sufficient number of them to give the same sectional area as would be adopted by either of the other plans would be more expensive, and considering the great distance and the undulating surface over which they would extend, other disadvantages were presented which added to the objections, and the plan was considered inexpedient. Could a line be graded so as to give a regular inclination from the Fountain Reservoir to one at the city, then the expense of laying iron pipes for conducting the proposed quantity of water, would be greater than for constructing a channel-way of masonry; and when laid, the pipes were thought to be less durable. Should the pipes follow the natural undulations of the ground, there would be so much resistance offered to the flow of water that the discharge would be diminished in a very great degree.

The close channel or conduit of masonry was adopted as the plan best calculated to answer all the purposes of conducting the water to the city.

Sources of the Croton River.

The sources of the Croton River are principally in the county of Putnam, at a distance of fifty miles from the city of New-York; they are mostly springs which in that elevated and uneven country have formed many ponds and lakes never-failing in their supply. There are about twenty of these lakes which constitute the sources of the Croton River, and the aggregate of their surface areas is about three thousand eight hundred acres.

From these sources to the mouth of the Croton at the head of Tappan Bay in the Hudson, the distance is about twenty-five miles. The country bordering upon the Croton is generally elevated and uneven, not sustaining a dense population and cleared sufficiently to prevent injury to the water from decayed vegetable matter. The river has a rapid descent and flows over a bed of gravel and masses of broken rock. From these advantages there is good reason to suppose that the water will receive very little impurity from the wash of the country through which it flows, and there is no doubt that the sources furnish that which is peculiarly adapted to all the purposes of a large city.

The water is of such uncommon purity that in earlier days the native Indian gave a name to the river which signified “clear water.”[5]

Flow of Water in the Croton River, Capacity of the Fountain Reservoir, &c.

The medium flow of water in the Croton, where the fountain reservoir is formed, exceeds fifty millions of gallons in twenty-four hours, and the minimum flow, after a long-continued drought, is about twenty-seven millions of gallons in twenty-four hours.

The dam on the Croton River is about 38 feet above the level which was the surface of the natural flow of water at that place, and sets the water back about six miles, forming the Fountain Reservoir which covers an area of about four hundred acres. The country forming the valley of the River was such as to give bold shores to this reservoir generally, and in cases where there was a gentle slope or a level of the ground near the surface of water, excavations were made so that the water should not be of less depth than four and a half feet.

The great length of this Reservoir is favourable for the purity of the water which enters the Aqueduct: spread over this large surface, it will have an opportunity to settle and part with some of the impurities which it receives, during rainy seasons, from the wash of the country through which it flows.

The available capacity of this Reservoir, down to the level where the water would cease to flow off in the Aqueduct, has been estimated at six hundred millions of gallons.

Could we suppose that the Croton River will ever in any season of drought, fail to furnish a supply greater than would be carried off from this Reservoir and the Reservoirs at the city by evaporation, we have still a supply of water which would be sufficient for one million of inhabitants during the space of thirty days (estimating the amount necessary for each inhabitant to be twenty gallons for every twenty-four hours.)

But we may assume the number of inhabitants at present to be one third of a million, and therefore we have a sufficient store of water in this Fountain Reservoir to supply them for the space of ninety days, in the emergency before supposed. In addition to the quantity in the Fountain Reservoir, we have sufficient in the Reservoirs at the city to supply one third of a million of inhabitants for about twenty-five days, at the rate of supply before mentioned. Thus we find, should such a limit as we have supposed ever happen to the supply from the River, the season of drought cannot certainly be supposed to continue during the length of time (about four months) that would be required for the present population of the city to exhaust the quantity in store when all the Reservoirs are full.

The minimum flow of water in the river where the dam is constructed, has been stated to be twenty-seven millions of gallons for every twenty-four hours. This would be a sufficient supply for one million of inhabitants, and should the population of the city increase to one million and a half, this supply, together with the quantity in store, will probably be sufficient during any season of drought. There is, therefore, no fear in regard to the supply for the present, and should the time arrive when the city will require more than the present facilities afford during low stages of the river, other streams may be found which can be turned into the upper branches of the Croton, or into the Aqueduct along its course. Other Reservoirs may also be constructed farther up the Croton to draw from in seasons of drought. These suggestions would only be useful to provide a supply during the low stages of the river, for at other seasons the flow of water in the Croton would be equal to the full capacity of the Aqueduct.[6]

General Design of the Channel-way and Reservoirs.

A description of the general design and purpose of the channel-way in connection with the Reservoirs will serve to give a clear understanding of the operation of the work. Having ascertained the elevation in the city at which it would be desirable to use the water, it was only necessary then, to find a point on the Croton River where a dam could be constructed that would turn the water into a channel having a gradual descent to the required elevation at the city. So that it may easily be conceived, it is only diverting the water into another channel where it will flow on unobstructed. The manner in which water is conducted from its natural channel, for the purpose of propelling the machinery of manufacturing establishments, by a race-way or other channel, is a simple illustration of the operation of this great work.

At the place where it was determined to build the dam across the Croton River, the surface of the natural flow of water was about 38 feet below the elevation required as a head for the water to flow into the Aqueduct leading to the city. By going farther up the river the dam would have been of less height, and a point might have been found where it would be only necessary to build a dam to turn the water, and not form a pond of much extent above it, but for such purpose it would have been necessary to go above where some important tributaries enter the river, and would have required a considerable extension of the Aqueduct. It was perhaps desirable to form this Fountain Reservoir, so that it would afford a supply of water to draw from, should there at any future time, in a season of drought, be more required for the use of the city than would be flowing in the river.

No essential change occurs in the form of the channel-way from the Fountain Reservoir on the Croton, to the Receiving Reservoir on the island of New-York; a distance of thirty-eight miles, except in crossing Harlem River to reach the island, and in passing a deep valley on the island, where iron pipes are used instead of the channel-way of masonry to provide for the pressure consequent upon a depression from the regular plane.

At these points the iron pipes descend and rise again, so that when the water is flowing in the channel-way they will be constantly full. Thus it will be perceived that the channel-way of masonry will never be filled entirely, so as to occasion a pressure on all its interior surface.

The surface of the Fountain Reservoir is 166⅙ feet above the level of mean tide at the city of New-York; and the difference of level between that and the surface of the Receiving Reservoir on the island of New-York, (a distance of thirty-eight miles) is 47⅙ feet, leaving the surface of this reservoir 119 feet above the level of mean tide. From the Receiving Reservoir the water is conducted (a distance of two miles) in iron pipes to the Distributing Reservoir, where the surface of the water is 115 feet above the level of mean tide. This last is the height to which the water may generally be made available in the city.

GENERAL CONSTRUCTION OF THE AQUEDUCT.

[Plate I]. is a section of the Aqueduct showing the form of the masonry used in earth excavations. The foundation is formed with concrete; the side walls of stone; the bottom and sides of the interior being faced with brick, and the top covered with an arch of brick.

In forming the concrete a mortar is made by mixing three parts of sand with one of hydraulic lime, and then mixing about three parts of stone, broken to a size allowing them to pass through a ring an inch and a half in diameter. Having thoroughly mingled the broken stone and mortar, the concrete is placed in its proper position and form, and brought into a compact state by using a pounder; and is then suffered to remain until it set, or become indurated, before any work is commenced upon it. The object should be to mix as many stones or pebbles as will thoroughly bed in the mortar, allowing none of them to come in contact, but all to be enveloped in mortar. This forms a body which becomes indurated and makes a foundation under the whole length of the Aqueduct like one continuous stone. It attains a degree of hardness which gives it the appearance of the conglomerate bearing the name of Pudding-stone, and is an article of the greatest importance in forming foundations for walls of great weight; superseding in many instances, where the soil is soft, the use of piles or other timber foundation.

Though we have evidence that concrete was used by the Ancient Romans in the foundations of some of their structures and even in the formation of their roads—such as the Appian-Way, and though we find it used in the foundations of the feudal castles of the Norman Barons of England, still it has not been introduced into the general practice of architecture until quite a modern date, and even at the present time is not widely appreciated in this country as a material of so much importance in foundations.

The side walls are laid up in a character of workmanship styled “rough-hammered work;” the stone required to be of sound and durable quality and laid in a manner to render the work water-tight. Though attention is given in some degree to insure a proper bond to the wall, yet the point more particularly attended to, is to make it compact and impervious to water. The bonding of the wall is not by any means disregarded, in all situations where it is required, yet the position of the work generally, where it is in excavation below the natural surface of the ground, renders such precaution of less importance than that of making it compact. The mortar used in these side walls is formed by mixing clean sharp sand with hydraulic lime, using the proportions of three parts of the sand to one of the lime; and these are thoroughly mixed and incorporated before they are wet; when this mixture is wet and thoroughly worked, it is used immediately and always kept properly tempered so as to render it plastic, and to prevent any disposition to become hardened before it is in the wall. After the side walls are finished and the concrete between them has received its proper form, a coating of plastering, about three eighths of an inch in thickness, is put on over the surface of the concrete and on the face of the walls before the interior facing of brick is commenced. The proportions of this plastering are two parts of sand to one of the hydraulic lime.

The bricks used in this work are generally of quite a different character from those used in ordinary house-building; being harder burnt and of a superior quality of material. They are required to be burnt to such a degree of hardness that they present a cherry red, or brownish color, and give a clear ringing sound when struck; and when broken, must present a compact and uniform texture. All bricks brought upon the work which are soft and of a pale color, such as are usually denominated salmon brick, are rejected. Those which are used, possess nearly the hardness and durability of ordinary building stone, and are calculated to resist the action of the water, to which they will be exposed.

The advantage of using brick is, that a smooth channel offering little resistance to the flow of water can be formed with less expense than with stone, and greater security can be obtained against any leakage; for besides the coat of plastering which covers the face of the walls and the top of the concrete, there is also a mortar joint between this plastering and the brick work. The bricks being of good form and easily handled, can be more expeditiously and closely laid than the face of a wall of stone, and afford a smooth and uniform face to the wall with less expense. They are required to be bedded full and flush with mortar, so that on lifting one from its position in the work, no imperfections be discovered, but the impress of the brick be found distinct throughout.

The proportions of the mortar for the brick work, are two parts of sand to one of hydraulic lime.