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<br />V. Description of Data and Software: Stream Depletion Factor Interface (SDF View) <br /> <br />3.0 Stream Depletion Factor Interface (SDF View) <br /> <br />Water managers use Stream Depletion Factors <br />(SDF) to determine the lag time from when <br />irrigation well water is pumped from, or water is <br />recharged to, an alluvial unconfined river aquifer <br />and when a depletion or accretion happens in the <br />river. Required input information for SDF View <br />is the consumptive use amount of the well water <br />or net recharge amounts and SDF values with <br /> <br />units of days for irrigation wells or recharge <br />basins (Figure 14). <br /> <br />For the South Platte River Basin in Colorado <br />SDF values are typically obtained from SDF <br />contours maps developed by the USGS (Hurr et <br />aI., 1972). See Warner et al. 1994 for a <br />description of the SDF methodology and its <br />application in South Platte recharge and <br />augmentation plans. <br /> <br /> <br />3.1 Back2round and Comoatibilitv with <br />Other Systems <br /> <br />The SDF View interface is based on the USGS <br />FORTRAN program to calculate depletions to <br />an aquifer based on groundwater withdraws. <br />SDF View uses this computational program <br />along with additional tools developed for <br />managers on the South Platte River. For example <br />a common task is to compute depletions or <br />accretions to the river based on projected data. <br /> <br />Figure 14: SDF View Interface <br /> <br />Projected data can be average values from <br />historical records or repeated historical records. <br /> <br />Tools in SDF View allow the user to do this <br />through menu items instead of requiring them to <br />build an input file for the computational <br />component. Input can also come from the speu <br />Model, based on estimates of groundwater <br />pumping withdrawn to meet crop watering <br />needs. This interface can be used as a stand- <br />alone model. <br /> <br />Completion Report: South Platte Mapping and Analysis Program <br /> <br />27 <br /> <br />~ <br />