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<br />""lI <br /> <br />""lI <br />""lI <br /> <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 itself operates like a reservoir <br />wi th fl uctuati ng 1 evel s from avai 1 ab 1 e recharge and demands. Thi s <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 />tained several gaging stations on the Rio Grande River and its <br />tributaries. The gaging stations listed in Table IV-3 were uti- <br />lized in this study (24). <br /> <br />Most of the early records are incompl ete. 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 />watershed above the point of diversion \Vas del ineated and correlated <br /> <br />]'/ _ 1 <br />