Abstract
A study of the hydrology of the shallow ground waters of the Oxnard Plain, Ventura County, California, was made using a network of piezometers at 10 and 20 ft below the surface. Mean depth to water is 6.8 ft and shows little difference between January and June readings during the years 1953–1956. The perched water table slopes to the south and southwest. It is only slightly above sea level near the coast. Piezometric head differences established the presence of a downward gradient over most of the area. The shape and rate of recession of the water table in tile‐drained land and tile effluent rate were measured at various sites. Twenty‐two per cent of water applied is discharged from tile lines as waste. Equipment and technique for hydraulic conductivity measurement in unstable soils is described.
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