. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. DISTANCE APART TO LAY LINES OF TILE 119 feet apart, one on either side of the proposed trench at the outlet, and a lath (c) is nailed to them horizontally one foot from the gromid (from top of lath), which would be five and one-half feet from the proposed grade line (0, X), or the bottom of the trench. Two other stakes {d, e) are driven in a similar manner at the upper end, and a lath (/) is nailed to these two feet from the ground, which would likewise be five and one-half feet from the g
. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. DISTANCE APART TO LAY LINES OF TILE 119 feet apart, one on either side of the proposed trench at the outlet, and a lath (c) is nailed to them horizontally one foot from the gromid (from top of lath), which would be five and one-half feet from the proposed grade line (0, X), or the bottom of the trench. Two other stakes {d, e) are driven in a similar manner at the upper end, and a lath (/) is nailed to these two feet from the ground, which would likewise be five and one-half feet from the grade hne. Other pairs of stakes are driven in line with the first ones at inter- vals of about 100 feet and to them lath are nailed horizontally and in line of sight over the top of the laths ^' (c)'' and ^' (/)." The trench is now dug until the top of a stick five and one-half feet long held vertically on the bottom of the trench is in line with the top of the laths. In this way a perfect grade can be obtained, a S. cy / L/he ^5j^2 feet -y y of sigh/- d e \ ^'/e feef / Fig Grade L/ne 53 —The use of grade lath m lajang of tile D, outlet ditch, iV, proposed outlet for tile, OXy proposed grade hne (See page 117.) because the line of sight over the laths is parallel to the proposed grade line. On extended flat areas it is necessary to lay tile deep at the outlet and shallow at the upper end, in order to secure sufficient fall On all large areas, especially if they are level or nearly so, it is best to secure the services of a competent drainage engineer to lay out the system of drainage and to supervise its construction. Covering the Tile.—^As soon as the tile are laid, sufficient amount of soil should be shoveled in to cover them, and to hold them in place imtil the trench is filled. Covering and anchoring the tile in this manner is called "blinding.'' Filling the trench may be done by hand, or by the use of a plow or a scraper. Distance Apart to Lay Lines of Tile.
Size: 1225px × 2041px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectsoils, bookyear1920
