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Note that for node 5 in the above figure there ar e no upstream model nodes having estimates of natural <br />streamflow, and as a resu lt, UPNAFLW equals zero. <br />Determine the time series for natural inflow at the specified model node: <br />? <br />NATINF = NATFLW - UPNAFLW (8) <br />n,j n,j j <br />where NATINF is the natural inflow (acre-feet per month) for node n. <br />n,j <br />Create an ASCII output text file (<basin>.INF) c ontaining the estimate of natural streamflow and <br />? <br />2 <br />inflows for the specified node location and pres ent the regression coefficients a, b, and r for <br />Equation (4). Store estimates of natural inflow for use by the MODSIM network model. A partial <br />example of an ASCII text output file is shown in Table 2. <br />3.0 CONCLUSIONS AND RECOMMENDATIONS <br />The use of the MODSIM model requires an input data set of natural inflows to each of the inflow nodes of <br />the network. Natural inflows are defined as those fl ows that would be present absent any activity by man. <br />nodeflow <br />This DMI utility ( ) develops these inflows by using natural flow estimates at key CRDSS core <br />coreflow nodeflow <br />gage stations that were previously estimated using a separate utility, . utilizes <br />correlations that relate average annual unit basin natura l flow at the core gage stations to the corresponding <br />mean basin elevation of the tributary drainage area for th at station. This correlation is then extrapolated to <br />the drainage areas for the subbasins tributary to the network model nodes. The annual estimates are then <br />distributed to a monthly time series using the monthly dist ribution at a selected core gage station. <br />nodeflow <br />Implementation of this DMI utility, , will result in a time series of monthly natural inflows for <br />each inflow node of the MODSIM network model. <br />6 <br />A275 01.09.95 1.15-16 Hyre, Fosha <br />