American Society of Civil Engineers


Cropping Systems for Utilization of Saline-Sodic Irrigation Waters


by J. D. Oster, (Department of Environmental Sciences, University of California, Riverside, CA 92521), S. Kaffka, (Department of Agronomy and Range Sciences, University of California, Davis, CA 95616), M. C. Shannon, (George C. Brown Salinity Laboratory, USDA-ARS, 450 Big Springs Road, Riverside, CA 92507-4617), and K. Knapp, (Department of Environmental Sciences, University of California, Riverside, CA 92521)
Section: Infiltration Issues, E T, and Models, pp. 1-6, (doi:  http://dx.doi.org/10.1061/40499(2000)141)

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Document type: Conference Proceeding Paper
Part of: Watershed Management and Operations Management 2000
Abstract: Cropping systems that include the sequential reuse of saline-sodic drainage waters could be a key component of irrigation sustainability along the Westside San Joaquin Valley in California. In this irrigated region, where there is no regional drainage outlet, such cropping systems could facilitate the installation of artificial drainage on 304,000 ha of lands with shallow water tables and reduce the volume of drainage water currently disposed in underground soil strata, or in evaporation ponds. The electrical conductivities of salinity of drainage waters on the Westside range from 6 to 20 dS/m, SARs range from 6 to 35, and the boron contents in 80 % of the drainage waters are less than 14 mg/L, with 50 % having less than 4 mg/L. Although these water quality characteristics limit the crops that can be grown, salt tolerant forages, trees, and shrubs provide options for sequential reuse. Sequential reuse of drainage water may eliminate the need for evaporation ponds by storing the remaining drainage water in soil strata beneath lands dedicated to the production of salt tolerant forages. A similar process occurs now beneath irrigated lands without artificial drainage, but on a much larger area. Alternatively, if fields receiving saline drainage water were artificially drained, the evaporation pond area needed could be decreased by at least a factor of five, or the capacity requirements of a regional drain reduced, if one were ever built.


ASCE Subject Headings:
Crops
Drainage
Irrigation water
Salinity
Water reclamation