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Irrigation Return Flows in Southern Idaho

Carter, David L. (1972) Irrigation Return Flows in Southern Idaho. pp. 47-53. In: Proc. Natl. Conf. on Managing Irrigated Agriculture to Improve Water Qual. 1972/05/16-18.


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The quantity and quality of irrigation return flows from a 203,000-acre irrigation tract in southern Idaho were measured and compared to the quantity and quality of the irrigation water. Return flows for a typical water year amounted to 929,350 acre feet representing 64% of the total water input to the tract. The total salt concentration in the subsurface drainage water was more than twice that found in the irrigation water. The mean electrical conductivity of the subsurface drainage water was 1040µ mhos/cm which is as low as in some irrigation waters. The Na+ concentration increased more than four times as water passed through the soil and became subsurface drainage water. Similar comparisons were made for other cations and anions. Surface runoff water did not differ from irrigation water in chemical quality. Surface drainage water from a 3,000-acre subregion contained up to 3.06 tons of sediment per acre foot during the midpart of the irrigation season.

Item Type: Conference or Workshop Item (Paper)
NWISRL Publication Number: 0248
Subjects: Mass Import - unclassified
Depositing User: Dan Stieneke
Date Deposited: 20 Nov 2010 21:56
Last Modified: 17 Feb 2017 18:59
Item ID: 989

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