. Engineering for land drainage. A manual for laying out and constructing drains for the improvement of agricultural lands. Drainage. 202 ENGINEERING FOR LAND DRAINAGES. the cost and care of such drains. Experience has demonstrated that in well-watered sections tile drains which are intended to provide outlets for large tracts cannot be made large enough without too great ex- pense to take care of exceptionally heavy rainfall with-. FiG. 40.~-Tiie Dram with Relief Surface Ditch. out the aid of surface drains. Another reason for the necessity of this provision is that many soils which under ord
. Engineering for land drainage. A manual for laying out and constructing drains for the improvement of agricultural lands. Drainage. 202 ENGINEERING FOR LAND DRAINAGES. the cost and care of such drains. Experience has demonstrated that in well-watered sections tile drains which are intended to provide outlets for large tracts cannot be made large enough without too great ex- pense to take care of exceptionally heavy rainfall with-. FiG. 40.~-Tiie Dram with Relief Surface Ditch. out the aid of surface drains. Another reason for the necessity of this provision is that many soils which under ordinary conditions will respond readily to the action of tile drains in removing water from the surface through the soil will not permit a sufficiently large quantity of water to pass to the drains in the short time required. If the ditches are left broad and shallow they will cause but little inconvenience and may be utilized for cultivated field crops or for grass. An estimate of the cost of the entire proposed work, including construction, legal and administration ex- pense, should be made and apportioned to the several property owners and interests concerned in the work. The Theory of Classification of Lands. The first step to be taken in determining the appor- tionment of cost which each tract of land should bear is to fix upon some scale of marking which shall numerically express the benefits to each tract of land, and which may be used in making a just and equitable. 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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