Introducing a [open quote]modular[close quote] approach to fish screen installation
A new fish screen design-the modular inclined screen-promises to offer a versatile and cost-effective solution for fish protection in many situation. In an effort to provide the hydroelectric industry with more cost-effective alternatives to existing fish screen designs, the Electric Power Research Institute (EPRI) recently has undertaken several research projects. One focus of EPRI's research has been on the development and testing of high-velocity fish screens. This program has led to the development of a new screening concept, which shows promise for providing effective protection for a wide range of fish species at hydro plants, steam generating facilities, and irrigation diversions. The concept, known as the Modular Inclined Screen (MIS), currently is being evaluated in laboratory studies prior to field application. The screen is of [open quotes]modular[close quotes] design so as to provide the flexibility necessary for application at a broad range of water intakes. The module is suitable for installation in penstocks, canals, and head pond intakes. The MIS module consists of an entrance with a trashrack, dewatering stoplog slots, an inclined wedgewire screen set at a shallow angle of 10 to 20 degrees to the flow, and a bypass for diverting fish to a transport pipe. The screen is mounted on a pivot shaft so that it can be cleaned via rotation and backflushing. The module is completely enclosed, and is designed to operate at water velocities ranging from 2 to 10 feet per second depending on the fish species and life stages to be protected. Laboratory studies are under way to evaluate the design configuration that yields the best hydraulic conditions for safe fish passage, and the biological effectiveness of this design in diverting selected fish species to the bypass.
- OSTI ID:
- 6203798
- Journal Information:
- Hydro Review; (United States), Vol. 11:7; ISSN 0884-0385
- Country of Publication:
- United States
- Language:
- English
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