Geohydrologic Effects on Drainwater Quality
Publication: Journal of Irrigation and Drainage Engineering
Volume 123, Issue 3
Abstract
This study was conducted on the water-district scale and provides insight into the effects of percolating irrigation water, local ground water, and regional ground water on the quantity and quality of drainwater from on-farm drains in the western San Joaquin Valley, Calif. Ground-water flow is downward in the upslope areas of the water district, but is upward from depths greater than 25 m below land surface in some downslope areas. Transitional areas exist where ground water flows laterally for distances as great as 3.6 km prior to interception by the on-farm drainage systems. Model results indicate that about 89% of the annual drainflow during 1987–91 originated as recharge directly above the drainage systems, and 11% of the annual drainflow was lateraland upward-moving ground water that originated as recharge in areas upslope of the drainage systems. There is general correlation between drainage systems that discharge high concentrations of selenium and areas that intercept upward-moving ground water.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 123 • Issue 3 • May 1997
Pages: 159 - 164
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: May 1, 1997
Published in print: May 1997
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