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<br />15 <br /> <br /><::> <br />-.J <br />~ <br />0) <br /> <br />Ground water <br /> <br />The ground water return flows to the surface system within the <br /> <br />hydrologic area can be expres sed as, <br /> <br />,:' <br /> <br />/\1'<' <br /> <br />\( I,; <br /> <br />;/' <br /> <br />GW = AGW + GWSC -iDB;. ..................... (2) <br /> <br />where GW is the ground water outflows, AGW is the sum of lateral <br /> <br />and canal seepage losses plus deep percolation losses computed in <br /> <br />subroutine ACUS, GWSC is ground water storage change, and DB is <br /> <br />again the return flows intercepted by the drainage system. <br /> <br />The ground water storage change is computed from the following <br /> <br />GWSC = WTF ~, TA '" SMSC. . . . . . .. . . . . . . . . .. . .. (3) <br /> <br />where WTF is the average change in the water table elevation over <br /> <br />the entire area, TA is the total area, and SMSC is the mean soil <br /> <br />moisture storage capacity of the area. SMSC was determined for the <br /> <br />project area from the soil map shown in Fig. 4, while the definition <br /> <br />of soil symbols is found in Table 2. <br /> <br />When considering the intensive study area, it should be noted <br /> <br />that the ground water outflows are the subsurface return flows to the <br /> <br />river. When considering the valley, this quantity will indicate outflow <br /> <br />from the valley basin. <br /> <br />Outflows <br /> <br />Familiar examples of outflows from a hydrologic area include <br /> <br />river outflows, ground water outflows, evapotranspiration, and <br />