Cherry Creek Valley Risk Assessment Applic

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. . GRANT APPLICATION - PART 2 Cherry Creck Valley Watcr & Sanitation District A key element in water supply planning is the assessment of the yield, reliability, and sustainability ofa project. CCV completed a yield study of the Wabash project as a part of the water right adjudication process in Case No. 94CW266 (Water Division I). That study showed that the project will meet a demand equivalent to 100 acres of irrigated bluegrass in forty percent (40%) of the years during a thirty year study period. Overall, the project met seventy-nine percent (79%) of the irrigation demand over the study period. Supplemental water supplies developed from the Denver basin aquifer system (nonrenewable, nontributary groundwater) and water conservation strategies provided supplemental water supplies during drought conditions. This proposal for funding from the Office of Water Conservation is for the development a risk- reliability assessment procedure for alternative conservation supply projects. The primary objective of the Wabash Risk / Reliability Assessment Project (WRRAP) is to translate the water supply yield evaluation completed for the Wabash Reservoir Complex into information that demonstrates the reliability and sustainability oflocally conserved water as an alternative to firm yield water supplies. The results of the WRRAP study will be presented in a professional report which details the risk assessment methodology as applied to the Wabash Complex. The project report will: .:. determine a risk-reliability rating for the Wabash Reservoir Complex as a water conservation replacement supply for existing and new irrigation demand; .:. identiJY the methodology used in the existing yield assessment and detail a process for transferring the procedures to other urban watersheds; .:. address the importance of incorporating water conservation and alternative supply strategies in water supply and yield assessments. The approach for this project is to utilize the water system reliability-yield evaluation pioneered for rooftop-rainfall collection systems in Edmonton, Canada. In this work, the City of Edmonton developed a procedure in which the efficiency of rooftop-rainfall collection systems was rated on the basis of their capacity for reducing the demand on the City's water system. Edmonton's final analysis indicated that a rooftop-rainfall collection system could meet approximately 85% of annual demand of a large urban garden and was viable alternative water supply. Specifically, Edmonton determined that individual rooftop-rainfall collection systems could play an important role in increasing the efficiency of their water use restrictions during dry years. 4