Ord 2020-087/amending Chapter 39 of the SM Code regarding Flood Damage Prevention by providing for enhances flood damage prevention and mitigation standards

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flood hazard. Dumpsters used during construction activities shall be anchored or located in an enclosure. Sec. 39.46.3. Construction. Construction activities within the floodplain that temporarily or permanently alter drainage characteristics will make accommodations to phase the drainage work such that at all times the conveyance of drainage from the surrounding areas will remain unaffected. No temporary increase in water surface elevation is allowed unless fully contained within drainage easement or designated right-of-way. Sec. 39.46.4. Floodplain Buffer In order to protect structures from the risk of flooding to an elevation equal to properties located within the floodplain a Floodplain Buffer has been established. A Floodplain Buffer will extend beyond the existing floodplain limits to the ground elevation matching the Base Flood Elevation plus the required Freeboard of two feet. Structures proposed within the Floodplain Buffer will be required to elevate to the Freeboard elevation and submit an elevation certificate to the City prior to the issuance of a Certificate of Occupancy. Sec. 39.047. Critical facilities. Construction of new critical facilities shall be, to the extent possible, located outside the limits of the SFHA, preferably outside the 0.2% annual chance floodplain. Construction of new critical facilities may be permissible within the SFHA if feasible alternative sites are unavailable. Critical facilities constructed within the SFHA shall have the lowest floor elevated 3.0 feet above the base flood elevation at the site. Flood proofing and sealing measures must be taken to ensure that toxic substances will not be displaced by or released into floodwaters. Access routes elevated to or above the level of the base flood elevation shall be provided to all critical facilities to the maximum extent possible. Sec. 39.048. Management methods and practices. The city shall use the following methods and practices for stormwater management: (1) Limit or regulate the rate of stormwater runoff from development to that which existed under conditions prior to development in those portions of the city as specified by the city; (2) Limit or control changes in the path of stormwater across or away from a site or development;