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Chapter 1: South Platte Basin Inventory March 21,1998 Page 1-14 I I I I I I I I I I I I I I I I I I I year. In the future the gross amount of reusable return flows from these sources is estimated to be approximately 40,000 acre-feet per year. Current plans for reuse of these future reusable flows amount to approximately 15,000 acre-feet per year. 1.1.6 Undeveloped Flows Undeveloped flows were estimated for the South Platte, Chatfield and Henderson gages using output data from Denver's Near Term PACSM model scenario. These flows reflect excess flows at these gage locations under future demand conditions based on modeled water rights and demands. The criteria for excess flows for the South Platte and Chatfield gages were meeting a 550 cfs flow target at the Henderson gage from April through September and no shortage to water rights above the Henderson gage. The criteria for excess flows for the Henderson gage were meeting a 550 cfs flow target at the Henderson gage from April through September and a 200 cfs target from October through March. Undeveloped flows for these gages are shown in Tables 1-17 through 1-19 and Figures 1-17 through 1-19. The subject of undeveloped flows at the Kersey gage has been previously addressed in the South Platte River Basin Assessment Report (Woodward Clyde, 1982). That study reported annual historical and anticipated future undeveloped stream flows at Kersey as averaging 186,000 acre-feet per year and 233,000 acre-feet per year, respectively, for the 1953-1978 hydrologic period. This previous analysis was reviewed and found to be a reasonably accurate estimate of undeveloped steam flows for this location. Due to budget limitations, this subject was not addressed further in this study. Hydrosphere Resource Consuttanls, 1002 Walnut Suite 200, Boulder, CO 80302