The water supply problem is of importance so momentous, and the official information collected by the Hydraulic Engineer being scattered through reports covering about twenty-five years—from 1883 until 1908—it is thought desirable to present the main official facts in a convenient digest for the general reader.
SUB-ARTESIAN WATER IN 1884.
Up to 1883, when the McIlwraith Government created the Hydraulic Engineer's Department by appointing Mr. J. B. Henderson to organise it, little had been done by the State for the improvement of the water supply of the country except in cities and towns. At that time no artesian water was known to exist in Queensland, but there was a popular belief that there were great underground supplies, especially in Western Queensland. Many station-owners had been active, and the diamond drill had been brought into use, but deep drilling had not then been undertaken. In October, 1884, the Hydraulic Engineer reported that he had just visited Widgeegoara Station, where the owners, Messrs. E. and J. Bignell, partly by sinking shafts and partly by boring, had obtained an underground pumped supply aggregating 94,000 gallons every twenty-four hours. This resulted from sinking four 5 ft. × 2½ ft. shafts an average depth of 102 ft. each, and thence boring and tubing below the bottom of each shaft to the average depth of 161 ft. Of the total quantity 20,000 gallons a day was obtained from the Four-mile well, a shaft sunk to a depth of 150 ft. below the natural surface. Besides this there was a homestead well 33 ft. deep. Analyses of the water showed that, in the opinion of the Government Analyst, only in one bore was it useful for watering sheep, it being brackish; but according to the station reports the supply from the Four-mile well and Nos. 1 and 2 shaft-bores was good stock water. Mr. Henderson warmly commended the Messrs. Bignell's enterprise.
IMPROVED BORING MACHINERY.
During the same month the late Hon. George King, of Gowrie, brought under the notice of the department a report by Mr. Darley, C.E., to the Government of New South Wales respecting certain American well-boring machinery by the use of which in Mr. King's opinion three-fourths of the cost of £6,000 incurred by his firm in sinking shafts in the Warrego district might have been saved. Besides which much greater depths could be reached, a machine costing £600 in America being capable of boring 2,000 ft. The matter being referred to the Hydraulic Engineer, that officer made inquiries which induced him heartily to endorse Mr. King's suggestion that the Government should secure from America a machine with two men experienced in working it and capable of themselves making any ordinary repairs. Mr. Henderson also recommended that a staff should be trained by the Americans after arrival, and expressed the opinion that this course would save both money and time, and prove a large gain to the colony. But he reminded the Minister that until there had been an abundant rainfall extensive operations in bore-sinking in the West could not be carried on, though he advised the introduction of a sufficient number of machines and enough tubing in order that during the next season, if rain fell, work should be vigorously commenced.
On 4th September, 1885, the Hydraulic Engineer replied in unequivocal terms to a minute of his Minister requesting him to comply with the wish expressed that he should purchase a Victorian diamond drill, then under offer, for coal-prospecting purposes. Mr. Henderson strongly recommended that no drill be purchased unless capable of boring holes at least from 5 in. to 2 in. in diameter. He also pointed out that where drifts and loose gravels were met with, and tubed, a deep bore must be commenced of large diameter to ensure success. Although the proposed drills were not ostensibly to be used for water-finding, it is evident that the Hydraulic Engineer, in reporting upon them, had that kind of work in view.
GOVERNMENT URGED TO IMPORT PLANT AND MEN.
On 2nd December following the Hydraulic Engineer addressed the Minister touching water-boring operations, and pointed out that, while there would be no difficulty in importing the machinery and appliances requisite for deep bores, he was convinced that men must be introduced from America to start and teach others here to work them. He recommended that an efficient plant should be ordered capable of boring up to 12 in. in diameter to a depth of 2,500 ft., for (say) £1,000, delivery at the works, and four good drillers under a two years' engagement brought out to work them at 21s. to 23s. per day, apparently of twelve hours; board, lodging, and travelling expenses to be defrayed by the Government.
OBSTACLES FROM DROUGHT.
On 20th February, 1886, the Hydraulic Engineer wrote that, understanding from conversations with the Minister that "the policy of the Government is to carry on water conservation works and boring for underground water with increased energy, he recommends the purchase of three Wright and Edwards' boring machines, capable of reaching a depth of 1,000 ft., for delivery within four months from the date of order." Three days later Mr. Henderson wrote:—"Unfortunately it can be said with much truth that, ever since the department's existence, the seasons have been unfavourable in the extreme for carrying out its plans." After mentioning the specific difficulties encountered, he added:—"I do not share in the idea that the late rains broke up the drought, as I cannot disguise from myself the fact that they have not been general, or even yet of sufficient quantity."