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The Call Analysis Program envisioned in Phase 4 of the SPDSS effort should allow users <br />to edit the input call data to allow for analyses comparing the `historical administration <br />regime' and potential `future administration regimes,' which might include some or all of <br />the following effects on river operations: <br />• Potential winter time calls in the future to fill reservoirs since agreements to allow the <br />fill of irrigation reservoirs without calls no longer exists./ <br />• More extensive use of 1929 refill calls the last several years and into the future, <br />• Increased recharge activities. <br />• Increased reuse of consumptive use supplies such as transbasin water. <br />• Installation of sprinklers for irrigation uses. <br />• Impacts of well administration. <br />Such an option to analyze historical versus future calls may be useful since the ongoing <br />discussion and analysis regarding winter and general South Platte River administration <br />issues by the State Engineer, well users, and vested water right holders may result in a <br />change to South Platte River administration in the future. <br />4. The enhanced historical call records can be used for calibration of the SPDSS surface <br />water model. <br />5. A surface water model that encompasses an upstream portion of a river basin can use the <br />enhanced historical call data to include downstream administrative impacts without <br />directly modeling them. Historical call data might be included directly or used to develop <br />a flow-based call function. <br />Where to find more information <br />^ SPDSS Task 1 Summary memorandum contains information regarding time lines of <br />water developments in the SPDSS Study Area <br />^ SPDSS Task 3 Meeting Notes summarizing discussions with Water Commissioners <br />regarding river administration in Water Districts in the SPDSS Study Area <br />Page 11 of 14 <br />