Hydraulic Features of Flexible Curtains Used for Selective Withdrawal

by Perry L. Johnson, US Bureau of Reclamation, Denver, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


Flexible curtain barriers are being investigated as a way to modify power penstock intakes to achieve selective withdrawal. The curtain barrier controls the elevation from which water is drawn. The curtain creates a reservoir within a reservoir. Stratification in the inner reservoir (between the curtain and the intake) depends on the stratification in the main reservoir, inflows from the main reservoir, outflows through the penstocks, and flow caused mixing. Withdrawal from the main reservoir (past the curtain) and withdrawal from the inner reservoir (through the penstock intake) create withdrawal layers as described by available theory. Comments presented in this paper are based on findings from a physical model study and design for Shasta Dam. To further develop these cost effective structures, efforts are currently being directed toward constructing an instrumented prototype.

Subject Headings: Water intakes | Reservoirs | Conduits | Water stratification | Hydraulic structures | Dams | Structural analysis | Water quality

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