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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />excess of consumptive use requirements is used for groundwater <br />recharge. In essence the aquifer itsel f operates like a reservoir <br />with fluctuating levels from available recharge and demands. This <br />practice was not modeled in the reservoir simulation operational model <br />because of the complexity of including the unconfined aquifer which is <br />a key link in the actual irrigation practices of the San Luis Valley. <br /> <br />B. Surface Water Supply <br /> <br />1. Monthly Streamflow Records <br /> <br />The United States Geological Survey (USGS) maintains or has main- <br /> <br /> <br />tained several gaging stations on the Rio Grande River and its <br /> <br /> <br />tributaries. The gaging stations listed in Table IV-3 were uti- <br /> <br />lized in this study (24). <br /> <br />Most of the early records are incomplete. For the study period <br />interval 1956 through 1986, however, most of the streamflow gaging <br />records were available. Missing data was estimated through correla- <br />tion with other gages. <br /> <br />a. Santa Maria Reservoir Inflow <br /> <br />Santa Maria is an off-stream reservoir. The capacity of the diversion <br />structure and pipeline/canal used to fill the reservoir is approximately <br />500 cfs. The diversion point is not gaged. <br /> <br />To estimate the available monthly flow at the diversion point, the <br /> <br /> <br />watershed above the point of diversion was delineated and correlated <br /> <br />IV - 4 <br />