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Rick Dinicola,
Associate Director, WA Water Science Center,
934 Broadway,
Suite 300
Tacoma, WA 98402

(253) 552-1603
graphic line

Bonaparte Creek GW

Project Summaries

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WA223 - Bonaparte Creek Ground-Water Study - Completed FY1982

Problem - Bonaparte Creek is an ungaged tributary of the Okanogan River. Water rights granted on the creek exceed low-flow conditions, and the creek has been closed to further appropriation by the Washington Dept. of Ecology (DOE). DOE has received numerous requests for additional ground-water appropriation in the basin. It is believed that some of the flow of the creek is contributed by ground-water inflow from Aeneas Valley (an intermountain valley situated on the divide between the Sanpoil and Okanogan Rivers). Much of this valley contains no streams but does have relatively large kettle lakes. DOE must determine if ground-water development will affect either the flow of Bonaparte Creek, the water level of the kettle lakes, or the flow of the W.F. Sanpoil, tributary to the Sanpoil River.

Objectives -The objectives of the study are (1) define the relationship between Bonaparte Creek and the ground-water system in the stream valley, and (2) establish the relationship between ground water in Aeneas Valley, Bonaparte Creek, W.F. Sanpoil, and the kettle lakes.

Approach - The overall approach will consist of mapping the surficial geology of Bonaparte Creek valley and Aeneas Valley from aerial photography and field work. The ground-water flow system in Bonaparte Creek and Aeneas Valleys and the relationship between ground water, the streams, and the kettle lakes, will be established by mapping the GW surface in both valleys. In so doing, the hydraulic gradient between the streams, kettle lakes, and the ground-water table will be closely established to determine the direction of flow. About 20 wells in addition to existing wells in the valleys will be installed to permit adequate mapping of the ground-water surface and determine the hydraulic gradient between the streams, lakes and ground-water system. All wells, lakes, and appropriate points along the streams will be leveled in.

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