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Subsurface Flows Water Balance Components for Irrigation Districts in the San Joaquin Valley





ITRC Report No.

P 99-002



10 pages



Stuart W. Styles and Charles M. Burt



March 10, 1999 USCID Conference on Benchmarking Irrigation System Performance Using Water Measurement and Water Balances. San Luis Obispo, CA.






Cal Poly ITRC has conducted several water balances for regions or districts within the San Joaquin Valley.  In each case, the greatest unknown component for the water balance is subsurface flows (ITRC, 1994).  Water balance calculations can be confusing, especially in districts where there is groundwater pumping.  This paper will discuss ITRC efforts to determine both lateral and vertical components of subsurface flow, the accuracy of the estimates, and the impact upon the accuracy of the final estimates of irrigation district or regional irrigation efficiencies.



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