Physical Evaluation of a Buried Drainage Systemby Stephen H. Ottemoeller, Westlands Water District, Fresno, CA, USA,
William R. Johnston, Westlands Water District, Fresno, CA, USA,
Abstract: The drainage problem in the 600,000 acre (1. 5 million ha) Westlands Water District (District), located in the Central San Joaquin Valley in California is that of a perched saline groundwater table. The problem, which covers about 180,000 acres (72,000 ha) of the District, is caused by stratified heavy clay, silty clay and silty sand layers which retard downward water movement resulting in a perched water table located 3 to 10 ft (1 to 3 m) below the ground surface. A procedure was developed to flush the soil sediments from the drains and to evaluate the system to determine the extent and type of repairs needed to rehabilitate the system to meet, as nearly as possible, the original design specifications.
Subject Headings: Drainage systems | Drainage | Clays | Soil treatment | Salt water | Soil water movement | Water table | Silt | North America | California | United States
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