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This input file is used to estimate natural streamflow at the USGS gage name station ID number 9110000 <br />and order number 1000. The output will be for the study period 1975 to 1990 with units of acre-feet per <br />month. There is one upstream sub-basin (basstaid1) in which unit consumptive use is available. No <br />adjustment is made to unit consumptive use. Irrigated acreage within the upstream basin is 200 acres. <br />Monthly depletion distribution coefficients for Option No. 2 will be used to relate annual consumptive <br />use to monthly streamflow depletion. There are three upstream ditch structures in which ditstaid1 diverts <br />water out of the basin (export); ditstaid2 diverts water into the basin (import); and ditstaid3 diverts water <br />for municipal uses. For the three ditch structures the adjustment factors are set to unity and consequently <br />there will be no changes for geographic variances. Default municipal return flow factors are used. There <br />is one upstream reservoir in which historic streamflow will be adjusted for change in storage. Input <br />information will be repeated for additional USGS gaging stations. <br />The USGS gaging stations for which natural streamflows will be estimated will be identified as a <br />minimum to supplementing the CRSS core stations. The ASCII text input control files will be created <br />Coreflow <br />after study of each basin. will estimate monthly natural streamflow at a specified USGS <br />gaging stations using historical data for (1) measured historic streamflow at the gage stations, (2) <br />upstream irrigation and municipal streamflow depletions, (3) upstream export and import diversions, and <br />(4) effects of upstream storage. Appendix B of this document provides a general flow chart of the DMI <br />coreflow coreflow, nodeflow <br />utility . Appendix C provides a general flow chart relating the use of , the <br />database, and the MODSIM interface. The following steps outline the procedure to estimate natural flow <br />at a specified USGS gage station: <br />From user-specified information, use the low-level DMIs to retrieve time series data for gaged <br />? <br />streamflow, diversions, unit consumptive use, and reservoir storage contents. <br /> <br />Determine the historical time series for total upstream monthly change in storage for the user- <br />? <br />specified reservoir structures: <br />R <br />? <br />STGSTG <br />STG = (1) <br />j,rj-1,r <br />j <br />r=1 <br />where STG is the total change in storage contents (acre-feet per month) for the current month <br />j <br />j, STG is end-of-month storage contents (acre-feet) for reservoir r, and R is the total number of <br />j,r <br />upstream reservoirs. A positive change in storage indicates an increase in storage contents <br />during the month and a negative change indicates a decrease in storage contents. The sign <br />(positive or negative) of DSTG must be maintained for later calculations. <br />j <br />Determine the historical time series for total upstream export and import diversions and the <br />? <br />total upstream diversions that bypass the USGS gaging station: <br />x <br />WFACDIV * <br />EXDIV = <br />x j, x <br />j <br />x=1(2) <br />M <br />6 <br />A275 01.09.95 1.15-15 Hyre, Fosha <br />