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Section 6 Water Needs Assessment Table 6-1 Summary of Suggestions for Determining Environmental and Recreational Needs , i= ~ ..F; ; Trout Unlimited - - ~r Annual Letter of Agreement Regarding Arkansas River Flows and Reservoir Releases for the Arkansas River Headwaters Recreation Area, from Executive Director Colorado DNR to the BOR and SECWCD Trout Unlimited - ^ Flow requirements for sustaining ^ USACE, Metropolitan Denver Water Supply ES, 1988. physical stream habitat and impacts that could result from altered flow regimes in various Metro Denver rivers Trout Unlimited - ^ 1-day and 30-day, and 3-year low ^ Contact plant operators or Colorado Pollution Elimination flows for stream reaches below Discharge Permits for each discharger wastewater treatment lant Trout Unlimited - ^ Assessing instream flow needs for ^ Various USFS EIS and Environmental Assessments - Ex: streams on National Forest System Arapahoe Basin Master Development Plan Final EIS, Prepared Lands by the White River national Forest, Dillon Ranger District, Se tember 1999 ~ Covington, J. Scott, and Wayne A. Hubert (2003). Trout Population Responses to Restoration of Streamflows. Environmental Management, 31(1), 135-147. 6.2 Implications of Uncertainty in Identified Projects/Processes and Existing Supplies In considering the M&I Identified Projects and Processes, the SWSI team and Basin Roundtable members recognized that there may be significant uncertainty in the implementation of many of these projects and processes. That is, any project that is not yet fully implemented could fail to result in the full amount envisioned, for various reasons. Reasons for projects not being fully implemented could include: ^ Competition for available water supplies as many providers have identified the same future sources ^ Identified Projects and Processes may yield less or store less than currently envisioned due to permitting constraints or other factors. Some projects may never be permitted or otherwise never be constructed due to implementation constraints. ^ The ability to develop water supply projects may be affected by the management of flows and habitat for endangered species as most water supply development projects will require certain federal permits. ^ Areas depending on non-renewable, non-tributary groundwater have reliability and sustainability concerns. Continued pumping of non-renewable groundwater to meet existing demands may become problematic due to declining water levels resulting in reduced well yields. ^ Agricultural and smaller water providers will have difficulty funding water development projects. Withoutjudging the merits of any individual water provider or basin's Identified Project and Processes, SWSI sought to understand the potential implications of the uncertainty associated with the Identified Projects and Processes. It was assumed that the projected additional savings associated with Level 1 conservation are certain to occur, because low-flow devices will continue to be installed in new fixtures and replace older, higher-flow devices in response to the National Energy Policy Act of 1992. Initial uncertainty levels of 25 percent and 50 percent were applied to the yield of the Identified Projects and Processes to illustrate the importance of currently-identified solutions in meeting Colorado's future water demands. r~ 6-H S:\REPORIIWORD PROCESSING\REPORllS6 11-8-04.DOC