Abstract
The west side of the San Joaquin Valley of California has had drainage disposal problems since irrigation wasintroduced in the early 1900s. Selenium toxicity problems associated with the Kesterson Reservoir caused closure of theexisting agricultural drainage system in 16 194 Ha (40,000 acres) in 1986. The continuing need for drainage of irrigatedagricultural lands has prompted several water management studies by the Water Management Research Laboratory of theUSDA. One of the essential data requirements in these studies is the quantification of drain flows. A measurement stationwas constructed for this purpose employing a manhole with a 90 V-notch weir and datalogging electronics to providehourly water flow data. Power was supplied by solar and conventional sources. Construction details, costs (for a solar-poweredstation), and resulting data are shown. As configured, the measurement station has provided seasonal datastreams for analysis during three years of operation.
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