05/10/1995 P&Z Packet - Laserfiche WebLink

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or flow line of the stream for at least 500 feet in either direction from the proposed development. 2. One copy of the above information shall be transmitted to a designated engineer or other expert person or agency for technical assistance in determining whether the proposed use adversely affects the capacity of the flood plain and to determine the Regulatory Flood Protection elevation. Procedures consistent with Minnesota Regulations NR 86-87 shall be followed in this expert evaluation. The designated engineer or expert shall: a. Estimate the peak discharge of the regional flood. b. Calculate the water surface profile of the regional flood based upon a hydraulic analysis of the stream channel and overbank areas. c. Compute the area necessary to convey the regional flood without increasing flood stages more than 0.5 feet. An equal degree of encroachment on both sides of the stream within the reach shall be assumed in computing the area of the regional flood. 3. Based upon the technical evaluation of the designated engineer or expert, the City Council shall determine whether the proposed use adversely affects the capacity of the flood plain or the Regional Flood Protection Elevation at the site. Subd. 3. Prohibited Uses. All other uses or structures not listed as permitted or conditional uses in the Flood Plain Overlay District shall be prohibited. Subd. 4. Nonconforming Uses. A structure or the use of a structure or premises which was lawful before the passage or amendment of the Section but which is not in conformity with the provisions of this section may be continued subject to the following conditions: A. No such use shall be expanded, changed, enlarged or altered in a way which increases its nonconformity. B. No structural alteration or addition to any nonconforming structure over the life of the structure shall exceed 50 percent of its Page 15