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<br />j <br />Ii" <br /> <br />;.'~i' <br />.. <br />X:I <br /> <br />,~ <br />-I <br />":J <br /> <br />., <br />:,)l:' <br />~I <br /> <br />, <br />'--.;1 <br /> <br />:::.:\ <br /> <br />..,' <br />. ~i <br />?! <br /> <br />-' <br /> <br />:'( <br /> <br />1998 report to the RIO Grande Compact Commission <br /> <br />Bureau of Reclamation <br /> <br />RIO GRANDE PROJECT (NEW MEXICO - TEXAS) <br /> <br />The Albuquerque Area Office's EI Paso Field Division, and the Elephant Butte Field <br />Division, are jointly responsible for operations of the Rio Grande Project. The Elephant <br />Butte Irrigation District and EI Paso County Water Improvement District NO.1 (Districts) <br />operated Reclamation's reserved works along the Rio Grande, including Percha <br />Diversion Dam, Leasburg Diversion Dam, and Mesilla Diversion Dam in New Mexico, <br />and the Riverside Diversion Cofferdam in Texas. The Elephant Butte Irrigation District <br />operated and maintained the three diversion dams in New Mexico under a contract with <br />Reclamation. The International Boundary and Water Commission (JBWC) operated <br />and maintained the American Diversion Dam and American Canal which are used <br />along with the International Diversion Dam to separate the U.S. waters and deliver <br />irrigation water to Mexico. The EI Paso County Water Improvement District NO.1 <br />(EPCWID) operated and maintained the diversion into the Riverside Canal in Texas. <br /> <br />Water Supply Conditions <br /> <br />Inflow into Elephant Butte Reservoir during 1998, measured at the Rio Grande <br />Floodway (FW) plus the Low Flow Conveyance Channel (LFCC) at San Marcial (FW+ <br />LFCC), was 781,750 af. The 83-year average annual inflow, measured at San Marcial <br />(FW+LFCC), is 884,740 af. The actual 1998 March through July runoff, measured at <br />San Marcial (FW+LFCC), was 447,200 af which was 89-percent of the 30-year average <br />of 501,000 af. During 1998, 804,420 af of water was released from Elephant Butte <br />Reservoir. There was a release of 808,660 afto meet the irrigation requirements of <br />project water users from Caballo Reservoir. <br /> <br />The January through May National Weather Service and Natural Resources <br />Conservation Service coordinated forecasts for the 1998 March through July runoff <br />season were as follows: <br /> <br />, <br /> Otowi % of 30-Year San Marcial % of 30-Year <br /> Month Runoff a Avera e Runoff a Avera e <br /> Jan 01 780,000 114 600,000 120 <br /> Feb 01 700,000 102 530,000 106 <br />" Mar 01 560,000 82 365,000 73 <br /> A r01 580,000 85 375,000 75 <br /> <br /> <br /> <br />Jun 01 <br /> <br />600,000 <br /> <br />88 <br /> <br />410,000 <br /> <br />82 <br /> <br /> <br />-16- <br />