Streamflow Depletions and Water Transfers in Idaho

by David R. Tuthill, Jr., Idaho Dep of Water Resources, Boise, United States,

Document Type: Proceeding Paper

Part of: Management of Irrigation and Drainage Systems: Integrated Perspectives


In the state of Idaho, streamflow depletions are quantified utilizing parameters of rate of flow, total volume diverted, and volume consumptively used. This paper summarizes the engineering procedures used to quantify streamflow depletions that occur as a result of direct diversions from streams, diversions to storage, and diversions by wells. These procedures include determination of validity of water rights, magnitude and timing of diversions, crop consumptive uses, irrigation requirements, irrigation application efficiencies, and return flows. In Idaho, water right transfers must be approved by the State of Idaho Department of Water Resources; therefore, Department personnel prepare reports describing the utilization of the engineering procedures to determine amounts available for transfer.

Subject Headings: Idaho | United States

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