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Updated Surface Water Management Plan (SWMP) <br />City of Ramsey, Minnesota <br />In areas adjacent to designated flood plains as mapped on a Flood Insurance Rate Map, <br />the Regulatory Flood Protection Elevation (RFE) applies. The RFE is defined as the <br />mapped 100 -year flood elevation plus 1 foot. However, the LRRWMO requires that the <br />low floor elevation of structures be 2 feet above the calculated flood elevation. Therefore, <br />all structures, including accessory structures, must be elevated on fill so that the lowest <br />floor including basement floor is lft above the Regulatory Flood Protection Elevation or <br />2 foot above the mapped 100 -year flood elevation. The finished fill elevation for <br />structures shall be no lower than the Regulatory Flood Protection Elevation and the fill <br />shall extend at such elevation at least fifteen (15) feet beyond the outside limits of the <br />structure erected thereon. The following drawing better defines the Regulatory Flood <br />elevations.6 <br />The following exhibit applies only when fill is required to bring a structure at least <br />two (2) feet above the 100 -year flood level. <br />Not to Scale <br />'l'op of Floor <br />at RFPE* <br />. <br />Flood <br />Fringe <br />-11 <br />Floo dway <br />1010 -Year <br />Flood Level <br />1-15. <br />No Fill Allowed <br />*RITE — regulatory Flood Protection Elevation <br />* 100 -Yr Flood Level includes the flood stage increase <br />(of up to Vz foot) due to filling in flood hinge <br />Minimum Standards for Structures in 100 -year floodplain <br />The numerous natural depressions found throughout Ramsey have been incorporated into <br />the SWMP as ponding areas. The effective use of ponding areas enables the installation <br />of outflow sewers with reduced capacities since the design storm duration is effectively <br />increased over the total time required to fill and empty the ponding reservoirs. Storm <br />sewers represent a sizable investment for the community and this investment can be more <br />6 Taken from the Minnesota DNR website: <br />http://www.dnr.state.mn.us/waters/watermgmt_section/floodplain/rfpe.html <br />Section IV <br />March 20, 2015 Page 32 <br />