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UPPER RIO GRANDE WATER OPERATIONS MODEL (URGWOM) General Summarv of Activities The URGWOM Technical team continued development of the physical modeling for most of the modeled region from the Colorado 1 New Mexico border to EI Paso Texas. The focus was from Cochiti Reservoir to American Dam in EI Paso, with enhancements and updates performed on the previously completed portion above Cochiti. Early in the year, the data set used was again reduced from 1975 through 1996 to 1985 through 1996, due to numerous data management difficulties including getting and simulating operational data prior to 1985 when much less data was collected, 1975 is still the target begin year for URGWOM, but for the first draft model due January, 2000, 1985 is the start year. In November, a simple model run example was added to the URGWOM webpage (http://www.spa.usace.army.mil/urgwom/modelintro.htm) and continued webpage enhancements were planned, In April, one CORPS team member left, but continued assisting through contracted part-time work, In October, two members were added to the technical team, one full-time USGS employee and the other a temporary assignment, full-time USBR employee, The first replaced the departed full-time Corps employee. Much effort went into modeling the middle valley (between Cochiti lake and Elephant Butte Reservoir), with a complex analysis of gains and losses required, Where gains and losses above Cochiti were successfully lumped together for each reach due to greater channel stabilities, losses required dis-aggregating in the middle valley to do a reasonable job of modeling, Included in middle valley individual gain/loss components are river surface water evaporation, groundwater interaction, and evapotranspiration from irrigated fields, Also modeled were irrigation diversions, returns, wastewater returns, and losses to and gains from the Low Flow Conveyance Channe/and other features, Significant physical modeling below Elephant Butte, specifically from Caballo Dam to American Dam was accomplished with the assistance of International Boundary Water Commission of EI Paso, Although development was intended to extend to Fort Quitman, Texas, the reach from American Dam to Fort Quitman is postponed until the effort is appropriately coordinated with The Republic of Mexico, Due to litigation activities, operational modeling below Elephant Butte is restricted to flood control operations only. . Another major activity has been the San Juan-Chama contractor accounting development, with operational rules, RiverWare for the Rio Cham a TestCase only provided for two water types; Rio Grande Basin and San Juan-Chama. Since then, development has focused on individually tracking all of the contractor waters ix