North Fork Hydro Electric Power Station

by Martin S. Fohrman, Raymar Engineering Inc, Walnut, Creek, CA, USA,

Abstract: Lake Hemet Municipal Water District has recently installed a hydro power station capable of producing approximately 200 KW of power during years of normal flow and 600 KW during periods of above normal wet weather flow. The facility utilizes three horizontal, centrifugal turbines capable of accommodating variable flows from 6 to 24 cfs at a variable static head, from 350 to 400 feet. An existing 28-in pipe transports source water from the confluence of Strawberry Creek and South Fork of the San Jacinto River to a new sand trap downstream of the confluence. An overflow structure was constructed about 2,000 feet downstream of the sand trap to intercept this flow. Approximately 8,000 feet of 28-in steel penstock was constructed to replace the existing gravity concrete pipe. The source water is used by the Lake Hemet Municipal Water District for irrigation and domestic water use after clarification and filtration. It is fully automated and has the capability of diverting water through the three turbines into two alternate discharge points. The total construction cost for the penstock and power station was 800,000 for a cost of 1,333 per KW of power.

Subject Headings: Hydro power | Power plants | Municipal water | Rivers and streams | Water flow | Turbines | Water supply systems | Conduits

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