Background After experiencing a drought year, the United States Bureau of Reclamation (USBR) at the Okanogan Irrigation District sought to install a water screen at Shell Rock station in order to activate the pumping site. The environment at Shell Rock is highly abrasive, due to its location on the outside bend of the Okanogan River. During a drought, the water in the river is sediment-laden and full of debris. Problem Initially, a s

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