. Engineering for land drainage. A manual for laying out and constructing drains for the improvement of agricultural lands. Drainage. LAND DRAINAGE PRACTICE. 39 ** The lines of tile in the field were laid 33 feet apart and about four feet below the surface. Small wells were sunk midway between the lines of tile and were therefore 16^ feet distant from drains on either side. The soil of the field consists of 6 or 8 inches of medium clay loam, followed by 2-| to 3 feet of clay, below which is a stratum of rather coarse sand, in the upper surface of which the tiles are usually laid. The tiles are
. Engineering for land drainage. A manual for laying out and constructing drains for the improvement of agricultural lands. Drainage. LAND DRAINAGE PRACTICE. 39 ** The lines of tile in the field were laid 33 feet apart and about four feet below the surface. Small wells were sunk midway between the lines of tile and were therefore 16^ feet distant from drains on either side. The soil of the field consists of 6 or 8 inches of medium clay loam, followed by 2-| to 3 feet of clay, below which is a stratum of rather coarse sand, in the upper surface of which the tiles are usually laid. The tiles are three inches inside diameter, and are laid on a grade of about two inches in 100 feet. At the time the levels were taken the tiles were discharging only one twentieth of their capacity. '^ The observed contour of ground-water in this field at 8 A. M., May 13, forty-eight hours after a rainfall of .Sy inch, is represented in Fig. 3. The highest water level in any well between these lines of tile on this date was one foot, in the case of well A measured above the 0lHiJfM7//M. Fig. 3.—Line of Saturation between Tile Drains 48 hours after a Rain- fall of -^Q of an inch. level of drain No. 14. The least was about .3 foot, in the case of well E above tile No. 18. Both wells C and E were sunk into a sand containing a considerable amount of gravel, and to this fact is probably due the less steep gradient at these places. Between well B and tile 16 two other wells were sunk, one two feet from the drain, and the other midway between the. 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 Elliott, Charles Gleason, 1850-1926. New York, J. Wiley
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