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I I I I I I I I I I I I I I I I I I I Senator Wash and Laguna Reservoin Operations at Senator Wash Reservoir allow regulation of water deliveries to United States and Mexican water users downstream at Imperial Dam. The reservoir is utilized as an off-stream storage facility to meet downstream water demands and to prevent waters above the Mexican order from flowing across the Northerly International Boundary (NIB) with Mexico. Senator Wash Reservoir is the first storage facility below Parker Dam, located approximately 142 river miles upstream. Operational objectives are to store excess flows in the river which have been caused by water user cutbacks and sidewash inflows due to rain. Stored waters are utilized to meet irrigation and recreational demands. An elevation restriction at Senator Wash Reservoir, due to potential piping at West Squaw Lake Dike and Senator Wash Dam, currently diminishes the storage capability of the Reservoir by about 4,000 acre feet. Laguna Reservoir is a regulating storage facility located approximately 7 river miles downstream of Senator Wash. Operational objectives are similar to those for Senator Wash Reservoir. The storage capability of Laguna Reservoir is currently diminished due to sediment accumulation and vegetation growth. Sediment accumulation in the reservoir has occurred primarily due to flooding that occurred in 1983 and 1984. Yuma Desalting Plant The Yuma Desalting Plant (YDP) was not operated in 1999 and will not be operated in 2000. Damage to most of the YDP' s associated facilities caused by the 1993 Gila River flood has been repaired. Those associated facilities are the Main Outlet Drain (MOD) the Main Outlet Drain Extension (MODE), and the Bypass Drain, which extends from the YDP to the Cienega de Santa Clara on the coast of the Sea of Cortez. Approximately one-quarter mile of concrete lining in the MOD, and several broken panels throughout the MODE and Bypass Drain, remain to be repaired. It is anticipated this repair will be performed by contract during the fall of 1999. All Wellton-Mohawk Irrigation & Drainage District drainage flows should be diverted into the MODE in 2000. There is a potential that a portion of the drainage return flows may be diverted to the Colorado River during short periods while repairs to the MODE and Bypass Drain are being made. These releases are not expected to impact the salinity differential requirements for the year. The Water Quality Improvement Center (wQIC) formerly referred to as the test train, has been expanded for research and for treatment of the Y AO Administration Building's service water. The WQIC processes about one million gallons per day of drainage water, delivered either from the MODE, pumped from an on-site well, or taken from the Cooper Lateral. The WQIC will continue to operate during calendar year 2000. An Education Center affiliated with the WQIC was constructed during 1999 to offer classes to the public in water treatment by reverse osmosis. The first class started in August 1999 in cooperation with Arizona Western College in Yuma. December 1, 1999 14