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<br />OiJ23;;9 <br /> <br />delivery, up to 1,200 acre-feet per month (1.48 mcm) will be delivered for Tijuana, Baja California <br />in 2005. <br /> <br />To further improve control of the deliveries of water from Parker Dam, Senator Wash Reservoir and <br />the reservoirs behind Imperial Dam and Laguna Dam will continue to be operated at lower elevations <br />during periods of potential rain storms to capture flows in excess of water demand at Imperial Dam. <br />Improvements to the river routing software used to schedule the releases from Parker Dam have also <br />reduced the uncertainty in estimating the flows arriving at Imperial Dam, further helping to reduce <br />non-storable flows arriving at Imperial Dam, As mentioned previously, other storage options are <br />also being investigated which will improve t he control of deliveries below Parker Dam when <br />constructed. <br /> <br />Measures that are being taken to ensure that the salinity differential requirements at the NIB will be <br />met include 1) reducing drainage pumping in the South Gila Valley in areas with more than adequate <br />depths to groundwater when necessary; 2) returning some drainage flows from the Yuma Mesa <br />Conduit to the Yuma Valley Drainage System and then to the boundary pumping plant at the SIB <br />with Mexico; 3) ensuring that no drainage water from the Main Outlet Drain Extension will be <br />spilled to the Colorado River; and 4) reducing drainage pumping from the Yuma Mesa Well Field <br />when necessary near areas with acceptable depths to groundwater (generally wells YM 10-13). <br />These reductions are generally made during periods when Mexico's water order is the lowest- <br />normally September, October, and November. In December of2003, several drainage wells in the <br />Yuma area were shut off to ensure that the salinity differential would not exceed the maximum <br />allowed. As stated in Minute 242, the maximum allowable differential is 145 ppm by the United <br />States' measurement or count and 151 ppm by the Mexican count. The final salinity differential in <br />2003 was 136 ppm by the United States' count and 147 ppm by the Mexican count. <br /> <br />Mexico has identified four critical months, October through January, regarding the quality of water <br />delivered at the SIB. As a matter of comity, the United States has agreed to reduce the salinity of <br />water delivered at SIB. To accomplish the reduction in salinity, the United States constructed a <br />diversion channel to bypass up to 8,000 af of Yuma Valley drainage water during the four critical <br />months. This water will be replaced by better quality water from the Minute 242 well field to reduce <br />the salinity at SIB. Currently, the facilities required to monitor the flow and salinity of water <br />delivered to SIB have not been installed or calibrated. Work on these facilities at SIB will take place <br />in water year 2005, <br /> <br />22 <br />