. Elementary lessons in the physics of agriculture. Agricultural physics. [from old catalog]. 154 representing the levels of the water on three different Fig. 5. Showing change in the level of water between tile drains. The grade of drains.—Securing a sufficient and proper fall or grade for lines of tile is one of the most im- portant problems of practical drainage. As a general rule it is desirable to secure all the fall that is possible, and this is especially true for all flat and large areas. The greater the fall per 100 feet the more rapidly will the water be removed, the less dan
. Elementary lessons in the physics of agriculture. Agricultural physics. [from old catalog]. 154 representing the levels of the water on three different Fig. 5. Showing change in the level of water between tile drains. The grade of drains.—Securing a sufficient and proper fall or grade for lines of tile is one of the most im- portant problems of practical drainage. As a general rule it is desirable to secure all the fall that is possible, and this is especially true for all flat and large areas. The greater the fall per 100 feet the more rapidly will the water be removed, the less danger will there be of the tile becoming clogged with silt and the smaller may be the tile used. A fall of two inches in 100 feet, one foot in 600 feet or 36 rods, has been found very satisfactory where the tile have been carefully laid; it is often necessary, if draining is done at all, to adopt a less steep grade than this, but higher grades are much safer and more effective and should be secured where circumstances will permit. When a particular grade has been decided upon it is a matter of the greatest importance, in the laying of the tile, to see that each and every piece is immovably placed exactly on the grade line. If careless laying of the tile is tolerated, which results in one section being placed above the grade line while another falls below it, sediment will tend to collect in the sags, and if the fall is slight, the tile small, and the deviation from the grade line nearly equal to the internal diameter of the tile, ultimate clog- ging is almost inevitable. It is often absolutely necessary to lay two or more sections of a line of tile on different grades, and in such cases it is always best to have the water pass from a less steep to a steeper grade, when this. 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 o
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Keywords: ., bookcentury1800, bookcontributorthe, bookdecade1890, bookyear1891
