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CRDSS <br />TASK MEMORANDUM 1.15-15 <br />Water Rights Planning Model <br />Data Management Interface Utility to Estimate Natural <br />Streamflow at U.S. Geological Survey Gaging Stations <br />1.0 ISSUE <br />This task memorandum outlines and describes the procedures of the data management interface (DMI) <br />utility that will be used to estimate natural streamflow at U.S. Geological Survey (USGS) gaging <br />stations. Natural flow is defined as the flow that would have historically occurred, absent of any activity <br />coreflow <br />by man (diversion and storage of water). This DMI utility will be named . This task <br />coreflow <br />memorandum will serve as the design document to guide the development of . <br />Under the U.S. Bureau of Reclamation's (USBR?s) Colorado River Simulation System (CRSS) program, <br />monthly natural streamflow has been estimated at a limited number of locations within Colorado River <br />basins. The locations where the USBR has estimated natural streamflow are called CRSS core stations, <br />and generally are at key USGS gaging stations. The USBR?s estimates of monthly natural streamflow <br />are for 1906 to 1984; for a few of the CRSS core stations, the estimates were extended to 1990. For the <br />CRDSS project, estimates of natural streamflow will be needed at additional USGS gaging stations that <br />will supplement the CRSS core stations. USGS gaging stations in which natural streamflow will be <br />coreflow <br />estimated pursuant to the procedures of will establish the CRDSS core stations. Natural <br />coreflow <br />streamflow at the original CRSS core stations can be recalculated using and could be used to <br />replace the old estimate of natural streamflow computed by the CRSS program (a bac kup of original <br />CRSS natural streamflow data will always be maintained). <br />Natural streamflow estimated at CRDSS core stations will be used to determine natural streamflow and <br />nodeflow <br />natural inflow at the MODSIM network model nodes using the DMI utility (Task <br />coreflow <br />Memorandum 1.15-16). The DMI utility will be run prior to the execution of the DMI utility <br />nodeflow <br />. <br />2.0 DISCUSSION/ANALYSIS <br />coreflow <br />The following assumptions are made concerning the development of : <br />Missing data for reservoir storage contents, diversions, and gaged streamflows have been filled <br />? <br />by the database group pursuant to Task 1.08. <br /> <br />Irrigated acreage tributary to the selected USGS gages in each basin will be available from the <br />? <br />consumptive use group. The acreage will be based upon the mapping provided by the Division <br />of Water Resources. <br /> <br />Unit consumptive use that is applicable to the irrigated lands above the USGS gage will be <br />? <br />available from the consumptive use group. <br /> <br />1 <br />A275 01.09.95 1.15-15 Hyre, Fosha <br />