Watertable Control and Reuse of Drain Waterby Lyman S. Willardson, Utah State Univ, Logan, United States,
Ghassan Mikati, Utah State Univ, Logan, United States,
Abstract: One of the short term alternatives for disposal of saline groundwater is direct reuse of agricultural subsurface drainage water for irrigation of the land being drained. If the groundwater is not excessively saline, does not contain potentially toxic elements, and if good quality irrigation water is available for mixing, the water table can be lowered, and the drainage water can be disposed of on a continuous basis without storage. The electrical conductivity of the mixed irrigation water must be kept below the threshold salt tolerance of the crop being grown, to the salinity of irrigation water. The limits of salinity that can be tolerated by the crop, the salinity of the ground water and the salinity of the irrigation water are the controlling parameters. Data from a long-term laboratory lysimeter study is showing how salt moves in the profile where recirculation is practiced.
Subject Headings: Salt water | Irrigation water | Hydro power | Water quality | Water storage | Drainage | Water table
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