. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. 118 LAND DRAINAGE AND IRRIGATION desirable to have a gradual fall of three inches in 100 feet if pos- sible. On flat areas, one and one-quarter inches, which is considered the minimum grade, is frequently used. It is important to remem- ber that the less the fall or gradient, the bigger should be the tile. When a good fall is apparent, it is comparatively easy to lay tile so that they will carry off the water properly. On level ground however, much care should be exercised in securing suff
. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. 118 LAND DRAINAGE AND IRRIGATION desirable to have a gradual fall of three inches in 100 feet if pos- sible. On flat areas, one and one-quarter inches, which is considered the minimum grade, is frequently used. It is important to remem- ber that the less the fall or gradient, the bigger should be the tile. When a good fall is apparent, it is comparatively easy to lay tile so that they will carry off the water properly. On level ground however, much care should be exercised in securing sufficient fall. (iftJAi '*. Fia. 52.—Samples of drain tile and the necessary tools used in constructing systems of tile drainage. (Wisconsin Station.) The level is the common instrument used in determining the amount of fall. Some experienced tilers determine the grade by the flow of the water in the trench before the tile are laid. Tile may be properly laid on a level area through the use of grade lath (Fig. 53). For example, a line of tile 600 feet long is to be laid, and it can be given a depth of four and one-half feet at the outlet. To give this line a fall of two inches in 100 feet the tile must be laid three and one-half feet deep at the upper end of the line. Two stakes (a, b) are driven about three and one-half. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Weir, Wilbert Walter, 1882-. Philadelphia London, J. B. Lippincott company
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsoils, bookyear1920
