Innovative Intake Protects Both Aquatic Life and Turbine Equipmentby Ronald F. Ott, Ott Water Engineers Inc, Redding, CA, USA,
Ed Boersma, Ott Water Engineers Inc, Redding, CA, USA,
James Strong, Ott Water Engineers Inc, Redding, CA, USA,
Abstract: The successful operation of small hydro projects requires an intake system with the ability to screen fish and debris from the water taken into the turbine. This separation may be required in order to protect stream bio-life and/or to protect the turbine from materials that would wear or clog components. Small intake systems also need to be reliable while requiring a minimum amount of maintenance. An intake screening system which meets these requirements has been developed. The system uses one or more concave screen panels arranged in a linear array. The system is installed along the crest of small dams or diversion structures. As the water flows over the crest and down the screens, a portion passes through the screens to the hydropower turbine. The remainder flows across the screen surface carrying aquatic life and debris downstream. Components are fabricated from stainless steel, and are designed for low maintenance free operation. Biolife, pine needles, leaves, and gravel are kept out of the penstock and the turbine. The design of the intake system minimizes the problem of clogging and reduced thru-flow.
Subject Headings: Turbines | Water intakes | Hydro power | Lifeline systems | Debris | Rivers and streams | Maintenance | Aquatic habitats
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