Irrigation Storage Probabilities of Small Reservoir

by Larry A. Kramer, Agric. Engr.; Watershed Res. Unit, North Central Region, Agric. Res. Service, U.S. Dept. of Agr., Columbia, MO,

Serial Information: Journal of the Irrigation and Drainage Division, 1974, Vol. 100, Issue 4, Pg. 485-494

Document Type: Journal Paper


Supplemental irrigation systems using a reservoir for water supply storage can be designed with a known risk of having inadequate storage to satisfy the yearly irrigation requirements. The relationships between irrigation demand, reservoir capacity, and reservoir failure probability were determined for a gaged reservoir watershed by applying a Markov Chain reservoir storage probability model. Twenty-seven years of observed and modeled reservoir budget data for a 97 acre-ft (120,000- m³) reservoir and a 154 acre-ft (623,000-m³) watershed were used to develop the demand-capacity-probability relationships for demands ranging from 0 to 100 acres (0 to 405,000 m²) of irrigated corn, reservoir capacities from 40 to 200 acre-ft (49,000 to 247,000 m³), and failure probability of 1 to 50%. The effect of varying irrigation efficiency on these relationships was also examined.

Subject Headings: Irrigation | Water storage | Probability | Reservoirs | Irrigation systems | Failure analysis | Watersheds | Hydrologic models

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