| Materials Required | ||
|---|---|---|
| Screened gravel or crushed rock | 3 cubic yards at $1.10 | $3.30 |
| Sand | 1½ cubic yards at $1.00 | 1.50 |
| Portland cement | 5½ barrels at $2.50 | 13.75 |
| $18.55 | ||
Well platforms are made like cistern covers ([see page 69]) except that they are not molded fixed in place, but loose and removable, so that the well can be cleaned at any time. Concrete well covers keep mice and frogs out of the well. Even scrub water cannot seep in.
Underground Cisterns and Cistern Platforms
Underground cisterns are useless if they leak. In dry weather they are empty, and at other times the ground water seeps in and makes the “soft” water as “hard” as that from the well. Concrete cisterns have no joints to leak: they are built in one solid piece.
In placing the cistern, select a site convenient to the principal down-spout and the kitchen. Do not forget to make allowance for 8-inch walls in laying out the plan. If the ground in which the pit is dug is sufficiently firm to stand alone, no outside form will be needed. Otherwise the hole must be dug large enough to receive an outside form built similar to the inside one. Make the inside form of 1-inch boards on 2 by 4-inch studding so that the siding will be toward the earth walls. Mix the concrete 1: 2: 4 and lay a 6-inch floor on the earth bottom. Immediately set the wall forms on all sides. In filling the wall space, be careful not to shovel the concrete against the earthen wall: dirt in concrete is liable to make a leaky wall.
After the concrete side walls have been brought to ground level, set a 5-inch board on edge around the outside of the cistern, so as to hold the concrete for the platform. Saw off the uprights of the inside form 6 inches below the finished top of the concrete cover, and nail 2 by 4-inch floor joists even with their tops. Floor the joists with 1-inch boards. Braces, to keep the wooden platform from sagging, may be placed down the middle of the cistern as shown in the drawing. To provide for a manhole opening, build a bottomless box 5 inches deep, 2 feet square at the top and 18 inches square at the bottom—outside measurements,—or have the tinsmith make a round bottomless tin form 5 inches deep, 2 feet in diameter at the top and 18 inches at the bottom, just like a large dishpan without a bottom.
Begin at one side of the platform, tamp in 1½ inches of concrete, and upon it lay heavy woven wire fencing. Allow the edges of the wire to extend within 1 inch of the outside lines of the platform. Bring the platform to its full thickness by immediately placing the remaining 3½ inches of concrete. Work rapidly and do not stop for any reason until the cistern cover is completed. As the work progresses, finish the surface with a wooden float. Grease the manhole frame and place it where the opening is desired. Strengthen the floor around the manhole opening by laying four short ½-inch iron rods, placed criss-cross, 2 inches from the bottom of the slab and the same distance back from the edges of the hole. If the tin form is used, the manhole cover may be cast at the same time as the remainder of the floor. Reinforce the cover with woven wire and also with four short lengths of ½-inch rods laid in the form of a square. Have on hand an old bridle bit or hitching post ring, which will serve as a lifting-ring for the concrete cover. In placing the ring in position, provide it with a knob of twisted wire, or with a nut and large washer, to fix it firmly in the concrete. If the wooden manhole form is used, carefully remove it after 5 hours. After 3 days build the manhole cover the same as for the tin form, with this important exception—place heavy paper, cardboard or leather around the edge of the opening to prevent the fresh concrete of the cover from sticking to it. Set bolts for a pump base according to directions given for [Gasoline Engine Bases], pp. 87, 88. The necessary openings for down spouts and for removing water may be made by embedding tile, of the proper diameter and length, in the concrete platform or side walls.