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Updated Surface Water Management Plan (SWMP) <br />City of Ramsey, Minnesota <br />the FEMA Flood Insurance Rate Map (FIRM) flood plains is attached as Figure <br />24. Flood studies have been performed for the following waterways: <br />a. Mississippi River <br />b. Rum River <br />c. Trott Brook <br />d. Ford Brook <br />Copies of the flood studies are available at the office of the City Engineer or <br />online at the FEMA Map Seryice Center. These studies have been incorporated <br />into the Official Zoning Map in accordance with Ramsey City Code Section II <br />Chapter 117, Article II, Division 4, Subdivision III... The Official Zoning Map is <br />on file in the Office of the City Administrator and the City Zoning Administrator. <br />In addition to the flood levels predicted by the FEMA flood studies, Bolton & <br />Menk performed a flood study of County Ditch 66 using the HEC-RAS stream <br />modeling This information has been coordinated with the SSA <br />modeling software and submitted to FEMA for agency acceptance as a flood <br />plain elevation. The 100-year flood plain has been recorded on the map along <br />with the FEMA data. The color -coded legend of Figure 24 helps to differentiate <br />between the federally modeled floodplain and the unofficial City flood plain. <br />In addition to the flood map, Tables 1 through 7, located in the Tables Appendix <br />of this report summarize the modeled 100-year flood levels and peak discharges <br />of existing storm water ponds and natural depressions that correspond to the peak <br />discharges of channel flow passing through the watershed. <br />After a detailed review of the new and available flood profile information, the <br />results appear consistent and provide a reasonable hydraulic grade from the upper <br />reaches of the various flood channels to the ultimate confluence with the Rum <br />and/or Mississippi Rivers. <br />5. Water Quality Information <br />Section 303d of the Clean Water Act requires that each state submit a list of <br />Impaired Waters. The MPCA website lists the impaired waters as officially <br />designated in 2014. Table 15 lists the impaired waters found in Ramsey: <br />Table 15 <br />303d Impaired Waters List Excerpt from MPCA <br />Pollutant or Year Target Target <br />Name Affected Use Stressor Designated Start Completion <br />Rogers Lake Aquatic Recreation Excess Nutrients 2006 2013 2017 <br />Rum River Aquatic Consumption Mercury, FCA 1998 2008 2025 <br />Aquatic Consumption Mercury, FCA 1998 2008 2025 <br />Mississippi River <br />Aquatic Consumption PCB, FCA 2002 2002 2025 <br />Section IV <br />March 20, 2015 Page 17 <br />