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CRDSS <br />TASK MEMORANDUM 1.15-12 <br />Water Rights Planning Model <br />Data Management Interface to Estimate Monthly Net Reservoir Evaporation <br />1.0 ISSUE <br />This task memorandum documents the design considerations of the data management interface (DMI) <br />that will estimate the net monthly evaporation for a reservoir. This task memorandum will guide the <br />development procedure. <br />The DMI utility will create the net reservoir evaporation time series or average annual evaporation for <br />each reservoir required by the water rights model. The DMI utility will be run before the execution of <br />the water rights model. The water rights planning model requires net reservoir evaporation for each <br />modeled reservoir in order to estimate the amount of evaporative water lost from the network. <br />2.0 DISCUSSION /ANALYSIS <br />The anticipated methodology employed by the net reservoir evaporation DMI utility is described in this <br />section. The net evaporation for a reservoir is estimated from the surrounding historical point <br />measurements of pan evaporation and precipitation. For this procedure the following assumptions have <br />been made: <br />All missing historical meteorological data will have been filled by the database group in Task 1.08. <br />? <br /> <br />A low-level DMI is available to retrieve historical meteorological station data on a monthly time <br />? <br />step. <br /> <br />A low-level DMI is available that returns meteorological stations within a specified distance <br />? <br />surrounding a specified structure (reservoir). <br /> <br />A low-level DMI is available that returns the type of data collected/available at a specified station. <br />? <br />All low-level DMIs will be developed under Task 1.05, Systems Integration. The DMI utility <br />( ) to estimate net reservoir evaporation will be developed under Task 1.15, Water Rights <br />netresev <br />Planning. The DMI utility ( ) will be run from the command line by specifying the reservoir <br />netresev <br />of interest. The specified reservoir will be the name of the reservoir limited to eight characters. For <br />example, to estimate the net evaporation for Taylor Park reservoir in the Gunnison River basin, the user <br />would type on the command line. The DMI utility will write the evaporation <br />netresev TaylorPk <br />time series to a flat file using the same name identified on the command line with an .evp extension <br />( evp). This name must correspond to the name of the reservoir in the water rights planning <br />TaylorPk. <br />model interface if the time series is to be read and used by the water rights planning model. The DMI <br />utility will include the following options, which are specified on the command line following the <br />reservoir name: <br />1 <br />A275 01.09.95 1.15-12 Ritsch <br />