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Updated Surface Water Management Plan (SWMP) <br />City of Ramsey, Minnesota <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 1 FPE* <br />iii_151 <br />Flood <br />Fringe <br />-111 <br />Floodway <br />100-Year <br />_Flood Level <br />1' <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 />efficiently utilized by ponding storm water in designated ponding areas and allowing <br />smaller diameter pipes to be used as outfall lines. <br />Equally as important as flood control and cost considerations, is the use of ponding areas <br />to: <br />1. Improve water quality; <br />2. Return storm water to the groundwater table; <br />3. Increase water amenities in developments for aesthetic, recreational and wildlife <br />purposes. <br />For water quality ponds, the storage below the outlet is the most important consideration. <br />The area and depth of the ponds may differ from the values presented here, storage below <br />the outlet must be provided so that the prescribed pollutant loading of the system is not <br />exceeded. <br />From time to time, local developers proposed enhancing required storm water ponds to <br />also serve as an amenity for new development. Most frequently, this entails allowing the <br />storm water pond to consistently maintain a certain level water. Amenity aspects are <br />maximized by careful planning in the initial development of any residential or industrial <br />Section IV <br />October 21, 2015 Page 33 <br />