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2023 Docket Enabling Ordinance December 19, 2023 <br />Page 102 <br /> <br /> <br />manage twenty-five-year peak flows in accordance with the WSDOT Hydraulics Manual. <br />Conveyance design calculations shall be included in the Drainage Report required as a <br />part of Core Element #1. Stormwater conveyance systems consisting of catch basins and <br />storm drain pipe are required for roadways with curbs and gutters or thickened asphalt <br />edges. Stormwater conveyance systems shall be designed and constructed in <br />accordance with the WSDOT Hydraulics Manual, all applicable WSDOT Standard Plans, <br />and the WSDOT Standard Specifications. See Section KCC 12.04.05.080 for additional <br />requirements for culverts. <br /> <br />12.04.05.070 Stormwater Site Plan Submittal Requirements for Subdivisions. <br />Submittal Requirements for Stormwater Site Plans (Reference Ch.3 of the SWMMEW) shall be as <br />follows for subdivision projects: <br />4. Preliminary Submittal Requirements <br />1. Collect and Analyze Information on Existing Conditions <br />a. Downstream Analysis <br />b. Identify areas of high erosion and sediment depositions <br />c. Locations of sensitive and critical areas <br />2. Determine Applicable Core Elements <br />3. Prepare a Conceptual Stormwater Control Plan <br />a. Identify Stormwater Conveyance System <br />b. Identify Stormwater Detention/Retention Area & Methods <br />5. Final Submittal Requirements <br />1. Apply preliminary subdivision conditions relating to stormwater <br />2. Prepare a Final Stormwater Control Plan <br />3. Provide a Drainage Report with supporting calculations <br />4. Prepare a Construction Stormwater Pollution Prevention Plan <br />