Cherry Creek Valley Risk Assessment Applic

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. . GRANT APPLICATION - PART 2 Cherry Creek Yalley Water & Sanitation District PROJECT DESCRIPTION Summary The Cherry Creek Yalley Water & Sanitation District (CCY) is developing the Wabash Reservoir Complex Storage project. This project will provide non-potable irrigation water service to a portion of the District's commercial and industrial customers thereby conserving treated water resources and infrastructure capacity. The Wabash Complex is an urban water storage project in which up to five small reservoirs will be constructed to capture local stormwater flows and free river water in Cherry Creek. The project is unique in that it is the first water development project in the Denver metro area to utilize urban runoff as a quantified water supply. Use of this resource will both conserve CCY's existing supply and serve as a prototype for projects that can be developed by other water providers. Additionally, the Wabash Complex Project will incorporate a water education program for local schools and provide a "living laboratory" for water resource education. The Wabash Risk / Reliability Assessment Project is proposed to develop an assessment procedure for evaluating the reliability of small water supply development projects that capture urban runoff as a conserved replacement water supply. CCY proposes to develop risk assessment procedure that translate the existing water supply yield into a conservation yield reliability assessment similar to that developed for rooftop-rainfall collection systems by the City of Edmonton, Canada. The estimated cost of this project is $8,450 with $4,225 offunding requested from the Colorado Office of Water Conservation. The project will be completed over a four to five month period. Project Proposal Traditional water resources planning approaches have emphasized the safe yield determination in which the value of a water supply is judged by its ability to fully meet the drought year demand. In other words, water supply design is typically based upon meeting a specified demand at 100% reliability without incorporating water conservation as a supplemental supply. Small watershed development projects like the Wabash Complex are designed to incorporate supplemental supplies into yield strategies where demand is met by a combination of a primary supply project, supplemental supplies and conservation strategies. This approach reduces water supply development costs and makes efficient use oflocal resources. 3