Publisher's Synopsis
Excerpt from First Aid for the Irrigator
The ground surface as prepared by Mother Nature is seldom suited to efficient application by gravity methods. The extent to which the ground surface may be leveled for irrigation depends on the cost of leveling and the depth of the soil. Heavy leveling requiring cuts of a few feet may be justified when the soil is deep, where the price of water is high, where high value crops are grown and the leveling can be done by heavy duty equipment to keep down the per acre cost of level ing. Some soils are so shallow and the subsoil so infertile that little, if any, leveling can be done profitably. Some leveling usually is necessary in all irrigation farming.
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