Estimating Firm Yield and Reliability of Small Reservoirs on Ungaged Streams in North-Central Montana

by Stephen R. Holnbeck, Montana Dep of Natural Resources, & Conservation, Helena, MT, USA,
Charles Parrett, Montana Dep of Natural Resources, & Conservation, Helena, MT, USA,



Document Type: Proceeding Paper

Part of: Engineering Hydrology

Abstract: A reservoir-operation algorithm utilizing a sequence of monthly streamflows from a lag-one Markov model is proposed for estimating firm yield and reliability. The reservoir-operation algorithm for firm yield and reliability was used for hypothetical reservoirs on each of the six gaged streams. The actual streamflow records were first used to determine reservoir capacities required to fully satisfy about 90 different demand levels. Simulated streamflows derived from the regional streamflow statistics and the lag-one Markov model then were used to determine reservoir capacities for the same demand distributions. The proposed algorithm appears to be a useful tool for evaluation of existing and proposed reservoirs anywhere in Montana.

Subject Headings: Reservoirs | Rivers and streams | Streamflow | Algorithms | Hydrologic models | Mathematical models | Computer models | Markov process | North America | United States | Montana

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