Laserfiche WebLink
1 <br />2 <br />3 <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br />11 <br />12 <br />13 <br />14 <br />15 <br />16 <br />17 <br />18 <br />19 <br />20 <br />21 <br />22 <br />23 <br />24 <br />25 <br />26 <br />27 <br />28 <br />29 <br />30 <br />31 <br />32 <br />33 <br />34 <br />35 <br />36 <br />37 <br />38 <br />39 <br />40 <br />41 <br />42 <br />43 <br />44 <br />45 <br />46 <br />47 <br />48 <br />49 <br />Information must be consistent with accepted hydrological and hydraulic engineering <br />standards and the standards in section 925(B)(3) below. <br />(3) The determination of floodway and flood fringe must include the following components, as <br />applicable: <br />a. Estimate the peak discharge of the regional (one percent chance) flood. <br />b. Calculate the water surface profile of the regional flood based upon a hydraulic analysis of <br />the stream channel and overbank areas. <br />c. Compute the floodway necessary to convey or store the regional flood without increasing <br />flood stages more than one-half foot. A lesser stage increase than one-half foot is required if, <br />as a result of the stage increase, increased flood damages would result. An equal degree of <br />encroachment on both sides of the stream within the reach must be assumed in computing <br />floodway boundaries. <br />(4) The zoning administrator will review the submitted information and assess the technical <br />evaluation and the recommended floodway and/or flood fringe district boundary. The <br />assessment must include the cumulative effects of previous floodway encroachments. The <br />zoning administrator may seek technical assistance from a designated engineer or other expert <br />person or agency, including the Minnesota Department of Natural Resources, before <br />presenting the technical evaluation and findings to the city council. The city council must <br />formally accept the technical evaluation and the recommended floodway and/or flood fringe <br />district boundary or deny the permit application. The city council, prior to official action, may <br />submit the application and all supporting data and analyses to the Federal Emergency <br />Management Agency (FEMA), the Minnesota Department of Natural Resources, or the planning <br />commission for review and comment. <br />(5) Once the floodway and flood fringe district boundaries have been determined, the city council <br />shall refer the matter back to the zoning administrator to process the permit application <br />consistent with the applicable provisions of sections 923 and 924. <br />926 Public Utilities, Railroads, Roads, and Bridges in Floodplains. <br />(A) Public utilities. All public: utilities and facilities such as gas, electrical, sewer, and water supply <br />systems to be located in the floodplain must be floodproofed in accordance with the Minnesota <br />State Building Code or elevated to the regulatory flood protection elevation. <br />(B) Public transportation facilities. Railroad tracks, roads, and bridges to be located within the <br />floodplain must comply with sections 923 and 924. These transportation facilities must be elevated <br />to the regulatory flood protection elevation where failure or interruption of these facilities would <br />result in danger to the public health or safety or where such facilities are essential to the orderly <br />functioning of the area. Minor or auxiliary roads or railroads may be constructed at a lower elevation <br />where failure or interruption of transportation services would not endanger the public health or <br />safety. <br />(C) On -site watersupply and sewage treatment systems. Where public utilities are not provided: <br />(1) On -site water supply systems must be designed to minimize or eliminate infiltration of flood <br />waters into the systems; and <br />(2) New or replacement on -site sewage treatment systems must be designed to minimize or <br />eliminate infiltration of flood waters into the systems and discharges from the systems into <br />flood waters and they must not be subject to impairment or contamination during times of <br />flooding. Any sewage treatment system designed in accordance with the state's current <br />statewide standards for on -site sewage treatment systems is considered to be in compliance <br />with this section. <br />927 Manufactured homes, Manufactured home parks, and Recreational Vehicles in Floodplains. <br />Page 125 of 160 <br />