*Hydraulic Structures, Black & Veatch Los Angeles, California, USA
**Hydraulic Structures, Metropolitan Waler District Los Angeles, California, USA
Presented in the Proceedings of the International Conference on Hydropower, Waterpower’95, San Francisco, California
The mission of the Metropolitan Water District of Southern California (MWD) is to provide its service area with adequate and reliable supplies of high-quality water to meet present and future needs in an environmentally and economically responsible way. This service area includes portions of Los Angeles, Orange, San Diego, San Bernardino, Riverside, and Ventura counties, an area with over 15 million people. When completed in 1999, the Domenigoni Valley Reservoir (OVR) Project, currently being constructed near Hemet, California, will nearly double the amount of surface storage available in MWD's service area and will provide a more reliable delivery of imported water during peak summer months, droughts, and emergencies. A t its maximum operating level the reservoir will cover 18,200,000 m2 (4,500 acre) and hold more than 987,000,000 m3 (800,000 acre-ft) of water.
The reservoir will be formed by two earth/rockfill dams, 7 km (4.4 miles) apart, within the Domenigoni and Diamond Valleys. The valleys do not have a water source, State Water Project water is gravity-fed to the reservoir through the Eastside Pipeline, and water from the MWD-owned Colorado River aqueduct is delivered into a forebay near the west dam and pumped into the reservoir. In both cases, the water enters the reservoir through the inlet/outlet (I/0) tower. When the water is drafted for use by MWD's member agencies, it is withdrawn through this tower and forwarded 10 pipelines and canals.
The I/O tower is socketed into the north rim of the reservoir near the west dam. It is 79 m (260 ft) lall, about 31 m (100 ft) in length in the direction of flow, and approximately 24 m (80 ft) wide. The tower includes nine piping tiers, each with two 2,135 mm (84 in.) diameter steel pipes for drafting and filling. The use of multiple tiers is based on M WD's need to control the temperature and quality of the water. Flow location is selected by operation of a butterfly valve in each of the 18 inlet/outlet pipes.
In this presentation, the configuration, operating features, hydraulic modeling, seismic analysis and structural design are described. To resist seismic forces, the tower is socketed and anchored into the rock on three sides.
