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• Need to accurately define historical flow and water use conditions in the South Platte basin, <br />including the flow conditions prior to the introduction of transmountain diversions <br />• Need to assess effects of irrigation practices (e.g., center pivot sprinkler development) on <br />water use over time <br />• Need to verify effects of historic and future development of tributary groundwater on <br />surface water users to assure depletions are adequately augmented <br />• Need to track transmountain water from the sources to the beneficial use, including <br />successive re-uses, and evaluate effects of changes and/or increases in transmountain <br />imports and associated uses on water supplies <br />• Need to evaluate effects of changes and/or increases in lawn irrigation return flows and <br />urban runoff on water supply <br />• Need to assess effects of existing or potential instream flow requirements on water use and <br />supply <br />• Need to investigate effects of proposed water rights changes on instream flows <br />• Need to assess water management strategies for Section 7 consultations, including aquatic <br />species that may be listed as Threatened or Endangered <br />• Need of a tool that could help users to assess water management strategies for the <br />Cooperative (Three States) Agreement. (This expressed need does not mean that the <br />SPDSS will evaluate Colorado's response to the Agreement, only that others could use the <br />tools developed for surface water planning for this purpose.) <br />• Need to assess the effect of proposed reserved rights claims on water uses <br />• Need to assess and enhance the quality of historic records of diversions, storage, and water <br />rights <br />• Need to provide historic call records, which have been interpreted to an attainable common <br />standard <br />• Need of additional data and analysis on historic river losses to assist (1) the Colorado State <br />Engineer in water rights administration, and (2) water users in developing water <br />management alternatives <br />• Need of additional data and analysis on point flows to assist (1) the Colorado State <br />Engineer in water rights administration and (2) water users in developing water <br />management alternatives <br />• Need to address the Senate Bill SB-74 recommendation to conduct biannual stream gain- <br />loss measurements in support of Denver Basin groundwater modeling efforts <br />• Need for renovation and/or addition of 11 stream gages, including 3 new rated control <br />sections in the lower South Platte River <br />• Need of additional satellite monitoring systems on existing diversion gages for 12 key <br />structures <br />p:data\gen\spdss~final report\chapter 2.doc 2-4 <br />October 31, 2001 <br />