. Engineering for land drainage. A manual for laying out and constructing drains for the improvement of agricultural lands. Drainage. 46 ENGINEERING FOR LAND DRAINAGE. tard the flow. But in locating mains in this way note that unless the slough slopes but little toward the centre Hne, one centre main of sufficient capacity gives better results. There are cases where this system may be followed advantageously both with respect to cost and efficiency, while in others it would prove expensive and faulty. See Fig. 7. Single-line System.—By this is meant the plan of laying parallel lines in the dir
. Engineering for land drainage. A manual for laying out and constructing drains for the improvement of agricultural lands. Drainage. 46 ENGINEERING FOR LAND DRAINAGE. tard the flow. But in locating mains in this way note that unless the slough slopes but little toward the centre Hne, one centre main of sufficient capacity gives better results. There are cases where this system may be followed advantageously both with respect to cost and efficiency, while in others it would prove expensive and faulty. See Fig. 7. Single-line System.—By this is meant the plan of laying parallel lines in the direction of the greatest slope, giving each a sepafate outlet into an open ditch as shown in Fig. 8. This is adapted to large areas which have very slight fall and where it is consequently necessary to use every inch of it in grade and depth of. Fig. 8.—Single-line System. drains, and also to avoid the use of excessively large tile for mains which under such circumstances would be required if a system involving mains and laterals were used. A caution which should be emphasized in locating drains on level land where grades must neces- sarily be very light is to avoid overcharging mains, a thing that is frequently done because the difference in grades is so often overlooked. These different systems, or modifications of them, may be used on different tracts, and in various localities. 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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