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2023 Docket Enabling Ordinance December 19, 2023 <br />Page 103 <br /> <br /> <br />6. Provide a copy of recorded Notice to Title – For maintaining private stormwater <br />drainage system prior to final project approval. The Notice to Title is available at <br />the Public Works Department. <br />12.04.05.080 Culverts. <br />Culverts with a minimum diameter of 18 inches and beveled ends with a 4:1 slope shall be <br />installed at all County road intersections, at all crossings of natural drainage courses, and at all <br />locations where the finished grade of the proposed roadway prism creates a collection point for <br />stormwater unless otherwise approved by the County Engineer. Culvert material shall be as <br />follows: <br /> <br />A. In fire prone areas, all culvert material shall be galvanized corrugated metal. <br /> <br />B. In non-fire prone areas, all culvert material shall be ADS N-12 as manufactured by <br />Advanced Drainage Systems, Inc. or approved equal. Approval of substitute materials <br />shall be at the sole discretion of the County Engineer or designee. <br /> <br />Determination of fire prone area boundaries shall be determined by the County Engineer or <br />designee. <br />In locations where larger diameter culverts are needed, the culvert shall be sized for 25-year <br />peak flow conveyance based on a hydraulic analysis conducted in accordance with the WSDOT <br />Hydraulics Manual. <br />For culverts greater than 24” diameter, end treatments are to be beveled or grated unless <br />otherwise approved by the Public Works Director. <br />All aspects of culvert design, including but not limited to culverts, headwalls, beveled end <br />sections, flared end sections, safety bars, pipe connections, and installation shall be designed <br />and constructed in accordance with the latest edition, as amended versions of the following <br />documents: <br />A. WSDOT Design Manual, <br /> <br />B. WSDOT Hydraulics Manual, <br /> <br />C. WSDOT Standard Specifications,