(A) The applicant must demonstrate that the development will not result in any of the following during the 1% annual chance flood: cause a stage increase of 0.00 feet or greater, obstruct flood flows, or increase velocities. This shall be demonstrated through hydrologic and hydraulic analysis performed by a professional engineer, or using other standard engineering practices (e.g. projects that restore the site to the previous cross-sectional area). This is commonly documented through a no-rise certification.
(B) Any development that would result in a stage increases greater than 0.00 feet may only be allowed with a permit if the applicant has applied for and received approval for a Conditional Letter of Map Revision (CLOMR) in accordance with 44 CFR § 65.12. Map revisions must follow the procedures in §§ 151.120, 150.150 and 150.151.
(C) Any development resulting in decreases to the water surface elevation of the base flood identified in the Flood Insurance Study requires a Letter of Map Revision (LOMR) following the procedures in §§ 151.120(D), 150.150 and 150.151.
(D) Any development in the beds of public waters that will change the course, current or cross section is required to obtain a public waters work permit in accordance with M.S. § 103G.245 or a utility crossing license in accordance with M.S. § 84.415, from the Department of Natural Resources, or demonstrate that no permit is required, before applying for a local permit.
(E) Any facility used by employees or the general public must be designed with a flood warning system acceptable to the Zoning Administrator that provides adequate time for evacuation, or be designed to ensure that within the area inundated during the base flood event, the depth (in feet) multiplied by the velocity (in feet per second) is less than four.
(F) Fill and other land alteration activities must offer minimal obstruction to the flow of flood waters, and be protected from erosion and sediment entering surface waters by the use of vegetative cover, riprap or other methods as soon as possible.
(Ord. 406, passed 11-27-1989; Ord. 607, passed 7-8-2024)