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Table 2 <br />Summary of Dewayne Schroeder Ground Water Aquifer Water Budget Analyses <br />(Values in 1,000's of Acre-Feet) <br />Water Bud et Items Dewa ne Schroeder (1991) Comments <br />Study Basin (Fig. 1) San Luis Valley Aquifer <br />Study Area (acres) 2,048,000 Surface Area above Aquifer <br />Study Period (years) 1970-87 <br />Inflows <br />San Juan Mtns (sw) 344 Recharge from rim flows <br />(gw) 124.7 Groundwater inflow from San Juan Hills <br />Subtotal 468.7 <br />Sangre De Cristo Mtns (sw) 312 Recharge from rim flows <br />(gam') 0 <br />Subtotal 312 <br />Irrigation Diversions into 214 Irrigation return flows to aquifer <br />Closed Basin <br />Other <br />Precipitation 90 Precipitation recharge estimated at 0.525 inches/acre <br />Total Inflows 1084.7 <br />Outflows <br />Consumptive Use <br />Beneficial 316.2 M&I (3.9 kaf/yr) plus net irrigation depletion of 312 <br /> kaf/yr <br />Non-Beneficial 605.6 ET by native vegetation from ground water <br />Subtotal 921.8 <br />Surface Water 60.2 <br />Ground Water 102.7 <br />Total 1084.7 <br />Change in Storage <br />Surface Water <br />Ground Water 0 <br />Total 0 <br />Water Balance Check 0 <br />Figure 1 shows the outline of each of the water budget areas. Comments regarding each water budget <br />investigation are organized by discussing the study area and study period used, followed by a discussion of <br />each of the main water budget components: <br />Water Budget: Inflows -Consumptive uses -Change in storage Ou flows <br />where; Inflows include basin precipitation, surface and ground water inflows, <br />Consumptive uses include crop cu, natural vegetation cu, evaporation, <br />Changes in storage include surface and ground water storage, and <br />Ou~ows include surface and ground water leaving the water budget basin. <br />rg_task8-1_2001-08.doc 4 of 19 Apri16, 2001 <br />