USGS Washington Water Science Center
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WA242 - Okanogan River Streamflow Modeling - Completed FY1982
Problem - The Washington State Department of Ecology is responsible for making management decisions regarding the allocation and use of available streamflow of the Okanogan and Similkameen Rivers. To devise a better means of management, DOE needs to obtain better information about the effects on water availability, storage, diversion, and returns and the interaction of those effects along varous reaches of the Okanogan and Similkameen Rivers. When those effects are understood, flow in the rivers and irrigation network can be more accurately evaluated and allocated.
Objectives - To determine the effects of diversions and returns on streamflow by evaluating streamflow, storage, and diversion along reaches of the Okanogan and Similkameen Rivers and to determine the impact that increased diversions, above the existing rights and domestic uses, would have on the base flows.
Approach - The objectives of this study will be met by utilizing a numerical stream flow model, the SSARR model. In conjunction with the configuration of the SSARR model to the Okanogan and Similkameen Rivers, all pertinent streamflow, reservoir, and diversion records needed as data input for the model will be compiled, checked and stored in a private data base. The model will be calibrated on 2-5 water years of record, be made with records of three water years, representing a dry, an average, and a wet year. After the model is calibrated and verified, an error and sensitivity analysis will be made. The model will be used to evaluate the effects of present diversions and returns on streamflow and the impact that future allocations would have had on streamflow during a 10-year historical period.