. Dairy farming : being the theory, practice, and methods of dairying. Dairy farms; Dairy plants; Milk plants. GRADIENT AND LOCATION OF DRAINS. U:i usually secured is about 1 in 200, and foi" ordi- naiy farm drainage, doubling the results g^iven in the table, we find that a drain of 2-iiKh tile will drain •!• acres; 3-iueh tile will drain 11 acres; 4-inch tile will drain 17 acres; 6-inch tile will drain 45 acres; 8-inch tile will drain 96 acres; which rule does not differ essentially from the one given by Waring in his work on " Farm ; The above rule is for casual, not
. Dairy farming : being the theory, practice, and methods of dairying. Dairy farms; Dairy plants; Milk plants. GRADIENT AND LOCATION OF DRAINS. U:i usually secured is about 1 in 200, and foi" ordi- naiy farm drainage, doubling the results g^iven in the table, we find that a drain of 2-iiKh tile will drain •!• acres; 3-iueh tile will drain 11 acres; 4-inch tile will drain 17 acres; 6-inch tile will drain 45 acres; 8-inch tile will drain 96 acres; which rule does not differ essentially from the one given by Waring in his work on " Farm ; The above rule is for casual, not thorough drainage. Fall of the Drain. From what has already been said in reference to the capacity of a drain, it is seen that tlie greater the fall, the greater is the amount of water that will pass, through in a given time, other things being equal. For this reason the fall should be as great as possible, within certain limits. It is possible to have drains so steep that the water, instead of entering the drain at the joint, will run along the outside of the tile, and finally undermine and destroy the drain; this danger is to be anticipated only for laig'e drains, where there is a great deal of water, and never for small drains, which serve only as feeders. The limits of steejmess for main drains that convey much water we may put at from 1 in 10 to 1 in 30, depending on the tenacity of the soil. The least gradient admissible depends entirely ujion the mechanical execution. Drains cannot be laid like water-pipes, alternately de- scending and ascending, but they must descend continuously from their commencement to their outlet. If laid with any portion ascending from the commencement, even though that portion may not rise above the head, the drains, not being tight, will let out at their joints much of the water from above them, the ground at that point being constantly wet, and the objects for which the drains were laid will entirely be destroyed. It is not material that u
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