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• Need to assess effects of land use changes (e.g., urbanization, contour terracing, stock <br />ponds) on groundwater recharge and surface runoff <br />• Need to evaluate the effect of changes in irrigation practices (e.g., flood to center pivot) on <br />groundwater recharge <br />• Need to determine whether or not current methods used to estimate stream accretions and <br />depletions (e.g., SDFs) are conservative <br />• Need to evaluate effect of phreatophytes on groundwater recharge and surface runoff <br />2.5.2 Denver Basin and Overlying Alluvium System Needs <br />Needs specific to the Denver Basin and Overlying Alluvium include: <br />• Need to assess the feasible yields of the Denver Basin aquifers <br />• Need to address the Senate Bill SB-74 recommendations which include: <br />- obtaining more reliable estimates of streambed conductance <br />- conducting biannual stream gain-loss measurements <br />- improving stream-aquifer simulation procedures <br />- collecting and interpreting more accurate well pumping data <br />- collecting and analyzing aquifer test data and core samples <br />- expanding the groundwater level measurement program <br />• Need to assess impacts to the tributary aquifers from well pumping in the underlying <br />Denver Basin aquifers <br />• Need to assess the effects of well pumping in each Denver Basin aquifer on flow in <br />adjacent aquifers <br />• Need to better characterize well pumping from each of the Denver Basin aquifers <br />2.6 CONSUMPTIVE USE NEEDS <br />Consumptive use analysis has been included in prior CDSS efforts in order to quantify basin water <br />uses and losses. This will continue to be an important analysis in order to better quantify and <br />characterize water use in the South Platte River basin. Consumptive use needs include: <br />• Need to quantify basin crop consumptive use for historic and current time periods to <br />understand how agricultural consumptive use has changed over time <br />• Need to quantify non-crop consumptive uses and losses due to human influence municipal <br />use, industrial use, livestock use, wildlife use, reservoir evaporation for historic and current <br />time periods to understand how growth has affected water use in the basin <br />• Need to estimate water use for the following types of water uses: <br />- native vegetation <br />- creation and maintenance of wildlife areas <br />p:data\gen\spdss~final report\chapter 2.doc 2-7 <br />October 31, 2001 <br />