2018-06-25-minutes-public-works-study-session

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B. In non -fire prone areas, all culvert material shall be ADS N-12 as manufactured by Advanced Drainage Systems, Inc. or approved equal. Approval of substitute materials shall be at the sole discretion of the County Engineer or designee. Determination of fire prone area boundaries shall be determined by the County Engineer or designee. In locations where larger diameter culverts are needed, the culvert shall be sized for 25 -year peak flow conveyance based on a hydraulic analysis conducted in accordance with the WSDOT Hydraulics Manual. All aspects of culvert design, including but not limited to culverts, headwalls, beveled end sections, flared end sections, safety bars, pipe connections, and installation shall be designed and constructed in accordance with the latest edition, as amended versions of the following documents: A. WSDOT Design Manual, B. WSDOT Hydraulics Manual, C. WSDOT Standard Specifications, D. All applicable WSDOT Standard Plans Driveways shall include culverts as required by the driveway approach section of these standards. 12.04.05.090 Fish Passage. All culverts associated with fish bearing streams in Kittitas County shall be designed for fish passage standards in accordance with the Washington State Department of Ecology, and Washington Department of Fish and Wildlife Water Crossing Design Guidelines. Fish passage facilities meeting the criteria of a bridge or major drainage structure shall be designed in accordance with KCC 12.04.06- 12.04.05.100 Stormwater System Operation & Maintenance. All stormwater drainage systems within current or future County right-of-way shall be designed and constructed in accordance with these standards, for maintenance by the County. All stormwater drainage systems constructed for the purpose of storage, conveyance, collection or treatment of stormwater generated on privately owned properties shall be designed and constructed in accordance with these standards, and shall be maintained at the expense of and by the property owner, developer, homeowner's association, or other responsible entity. This responsibility and the provision for maintenance shall be clearly stated on subdivision and short plat plans and/or drainage improvement plans. Prior to final approval of any plan of development or other development for which a permit is required under this article, the property owner shall execute a maintenance agreement acceptable to the Title 12 Kittitas County Code Draft No. 5— Working Draft for Adoption 6/12/2018 50