Ord #177 - Flood Plain Management Ordinance

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(5) Railroads, streets, bridges, utility transmission lines and pipelines, provided that the Department of Natural Resources' Area Hydrologist is notified at least ten days prior to issuance of any permit. 78-1117 Standards for Floodway Permitted Uses: (1) The use must have a low flood damage potential. (2) The use must not obstruct flood flows or cause any increase in flood elevations and must not involve structures, obstructions, or storage of materials or equipment. (3) Any facility that will be used by employees or the general public must be designed with a flood warning system that provides adequate time for evacuation if the area is inundated to a depth and velocity such that the depth (in feet) multiplied by the velocity (in feet per second) would exceed a product of four upon occurrence of the regional (1% chance) flood. 78-1118 Conditional Uses: The following uses may be allowed as conditional uses following the standards and procedures set forth in Section 78-1148 of this ordinance and further subject to the standards set forth in Section 78-1119, if otherwise allowed in the underlying zoning district or any applicable overlay district. (1) Structures accessory to the uses listed in 78-1116 (1) (5) above and the uses listed below. (2) Extraction and storage of sand, gravel, and other materials. (3) Marinas, boat rentals, docks, piers, wharves, and water control structures. (4) Storage yards for equipment, machinery, or materials. (5) Placement of fill or construction of fences that obstruct flood flows. Farm fences, as defined in section 78-1111, are permitted uses. (6) Travel -ready recreational vehicles meeting the exception standards in section 78-1144. (7) Levees or dikes intended to protect agricultural crops for a frequency flood event equal to or less than the 10 -year frequency flood event. (8) All forms of shoreline protection, including wood, metal, mortared stone or concrete seawalls. 78-1119 Standards for Floodway Conditional Uses: (1) All Uses. A conditional use must not cause any increase in the stage of the 1% chance or regional flood or cause an increase in flood damages in the reach or reaches affected. (2) Fill; Storage of Materials and Equipment: (a) The storage or processing of materials that are, in time of flooding, flammable, explosive, or potentially injurious to human, animal, or plant life is prohibited. (b) Fill, dredge spoil, and other similar materials deposited or stored in the floodplain must be protected from erosion by vegetative cover, mulching, riprap or other acceptable method. Permanent sand and gravel operations and similar uses must be covered by a long-term site development plan.