Agenda - Council - 10/27/2015 - Laserfiche WebLink

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Ordinance Language 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. 4.3 Conditional Uses: The following uses may be allowed as conditional uses following the standards and procedures set forth in Section 10.4 of this ordinance and further subject to the standards set forth in Section 4.4, if otherwise allowed in the underlying zoning district or any applicable overlay district. 4.31 Structures accessory to the uses listed in 4.1 above and the uses listed in 4.32 - 4.37 below. 4.32 Extraction and storage of sand, gravel, and other materials. 4.33 Marinas, boat rentals, docks, piers, wharves, and water control structures. 4.34 Storage yards for equipment, machinery, or materials. 4.35 Placement of fill or construction of fences that obstructflood flows. Farm fences, as defined in section 2.918, are permitted uses. 4.36 Travel -ready recreational vehicles meeting the exception standards in Section 9.3. 4.37 Levees or dikes intended to protect agricultural crops for a frequency flood event equal to or less than the 10-year frequency flood event. 4.4 Standards for Floodway Conditional Uses: 4.41 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. 4.42 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. (c) Temporary placement of fill, other materials, or equipment which would cause an increase to the stage of the 1% percent chance or regional flood may only be allowed if the (Governina Bodvjhas approved a plan that assures removal of the materialsfrom the floodway based upon the flood warning time available. 4.43 Accessory Structures: (a) Accessory structures must not be designed for human habitation. (b) Accessory structures, if permitted, must be constructed and placed on the building site so as to offer the minimum obstruction to the flow of flood waters: July 2015 8 Commentary Note that these conditional uses are optional for the community but, if allowed, must meet the standards in Sections 4.4. Communities are encouraged to select only those conditional uses that are appropriate for their conditions. Optional statement in 4.35 allows typical farm fences such as barbed wire fences that don't obstruct flood flows as permitted uses. See also Section 10.21(c). Section 4.36 is optional: we recommend treating recreational vehicles as conditional uses so that road access and warning systems are carefully reviewed to ensure public safety in times of flooding. Note that flood control projects intended to remove areas from the floodway to allow development of single or multiple structures are not permitted unless a Letter of Map Revision (LOMR) can be obtained to change the floodway boundary. Contact DNR Floodplain Program staff for further information. 4.42 (a) and (b) must be included if deposition or storage of fill is allowed in the floodway Alternative (c) is an optional alternative allowing temporary storage of fill or other materials that could increase flood stage, suitable for locations where adequate flood warning times will be available to allow removal of materials. If accessory structures are to be allowed in the floodway, items (a) through (c) are required.