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>HELMS PUMP STORAGE PENSTOCK ACCESS TUNNEL REHABILITATION: WATERPROOFING A HYDRAULIC TUNNEL UNDER 1,800+ FEET (550+ Meters) OF STATIC WATER PRESSURE
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HELMS PUMP STORAGE PENSTOCK ACCESS TUNNEL REHABILITATION: WATERPROOFING A HYDRAULIC TUNNEL UNDER 1,800+ FEET (550+ Meters) OF STATIC WATER PRESSURE
The Helms Pumped Storage Project conduit and penstock system connects Courtright and Wishon reservoirs, whose maximum water surface elevations are 2,491 m and 1,997 m, respectively in the Sierra Nevada Mountains of central California. The powerhouse complex is located more than 335 m underground in granitic rock. Its generating units are at elevation 1902 m and have a maximum static head of 531 meters. The nominal design flows are 260 m3/s generating and 215 m3/s pumping. The site is approximately 80 km northeast of Fresno, California. The Penstock Access Tunnel (PAT) is approximately 76 meters (m) long and ~ 7.6 m in diameter. At the interface with the dry tunnels of the powerhouse complex there is a 11 m long concrete plug with maximum static hydrostatic pressure exceeding 520 m. The PAT has been in operation for more than 30 years and there was a desire to reduce seepage of high pressure water from the tunnel into the mountain and into the concrete tunnel plug.
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