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Feasibility Report Mattamy Homes Water Reuse WSB Project No. 2988-01 was determined that infiltration is not feasible. In this instance, the RCWD Rules state that stormwater irrigation can occur in lieu of infiltration as a volume reduction practice. The three scenarios in this study reflect this determination. 2.2.3 Current Irrigation Practices The City currently regulates irrigation within the community to promote water conservation. It is estimated that irrigation accounts for 43% of the potable water used in the City each year (Appendix B, Table 1). The large proportion of water allocated towards irrigation presents an opportunity for the City to reduce its summer demand on the potable water system through water reuse. 2.3 PROPOSED IMPROVEMENTS There were three options identified to coincide with the Mattamy development Option 1: Irrigating Public Spaces with Storm Water Option 1 includes a water reuse irrigation system for public open spaces within the Mattamy Homes Development. This system includes the park in the center of the development as well as the berm on the east side of the development. In total, the irrigated area for Option 1 is 11 acres. A figure depicting Option 1 is shown as Appendix A, Figure 2. Option 2: Irrigating Public Spaces and Townhomes with Storm Water Option 2 includes a water reuse irrigation system for public open spaces and multi-family residential (townhome) area in the southeastern portion of the development. The townhome area includes 12 acres of green space that will require irrigation, in addition to the 11 acres irrigated in the public space. A figure depicting Option 2 is shown as Appendix A, Figure 3. Option 3: Irrigating all of the Mattamy Development with Storm Water Option 3 includes a water reuse irrigation system for public open spaces, multi- family residential townhomes, and single-family residences. A fourth municipal utility would be installed throughout the development . The third option requires homeowner education and interaction for system management and coordinatation with City maintenance staff. The total irrigated area for Option 3 is 144 acres. A figure depicting Option 3 is shown as Appendix A, Figure 4. A water balance analysis was completed and can be found in Appendix D. The water balance summary for each option: Option 1: Irrigating Public Spaces with Storm Water The water balance model indicates that the storm water stored can sufficiently supply water for irrigation of the public spaces with minimal pond level fluctuations.