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Memure B lb. The detention/retention facilities should be operated to contain and <br />rele.~se runoffat a rate consistent with the Zone 7 Master Plan. <br /> <br />.Fjllii!~: Changes or alterations have been required in,-or incorporated into, the <br />Project which avoid or substantially lessen the significant environmental effect <br />identified in the Final ErR to a less than significant level. <br />Facls in Sunoort of Finding: The impact will be avoided or reducedbased on the <br />following: <br /> <br /> a. Adequate facilities shall ensure that the Project does not increase the peak <br />run-off. These include the creation of a natural creek in the Cenl~al Parcel running <br />souti~ along 1-680 to a detention pond, and the creation of other detention ponds. <br /> b. The Project features and facilities have been designed to accommodate <br />runoff, including retention facilities capable of retaining project runoff in the 100-year <br />storm event. <br /> <br /> c. PUD Condition requires that all storm drain improvements must be <br /> based on storm water runoff modeling demonstrating sufficient capacity, and storm <br /> drain detention basins must detain peak runoffanticipated under 100-year storm <br /> events. <br /> <br /> d. PUD Condition ~ requires a long-term maintenance plan for the <br /> detention ponds, which will ensure that the storm drainage improvements are managed <br /> and operated as required. <br /> 2. l!!tl~l~-]~. Localized flooding may occur due to storms in excess of design <br /> capacities of side channels or culverts. <br /> <br />Mmsure B3. Design subdivision (channels, culverts, streets, open spaces, retention <br />basins, and site grading) in a comprehensive manner such that no habitable buildings <br />are subject to flooding in a 100-year storm event. <br />~: Changes or alterations have been required in, or incorporated into, the <br />Project which avoid or substantially lessen the significant environmental effect <br />identified in the Final ErR to a less than significant level. <br />Fa~s in Sut~port of Findinff: The impact will be avoided or reduced based on the <br />following: <br /> <br /> a. Require all subdivision improvements, such as storm drain lines, streets, <br />curbs and gutters, channels and culverts and open spaces be designed in a <br /> <br /> <br />