Agenda - Public Works Committee - 03/31/2015

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Updated Surface Water Management Plan (SWMP) City of Ramsey, Minnesota Necessary land use and public utility services information is limited to information that existed at the time the plan or plan amendment was developed, including: a. A general map of existing land uses (Figure 26A); b. A general map showing anticipated land uses (Figure 26B); and c. A reference to the location of the metropolitan urban service area. Land use is one of the primary mechanisms that affect flooding and water quality. As prairie and forested areas are converted to agricultural and urban uses, the volume and rate of storm water runoff increases. This increase in storm water runoff can cause a change in the bank full flow of area streams and conveyances. This can cause stream bank erosion and deterioration of the stream. In addition, increased area runoff can cause erosion in steep areas. The conversion of natural land cover also increases the amount of pollutants in storm water runoff such as the levels of pesticides and nutrients from agricultural land use, and trace metal concentrations from urban land use. Pollutant loading analysis has not been included within this report. This plan estimates the future land use throughout the study area in order to evaluate the drainage system needs. Although pollutant concentrations may not vary greatly between land uses, pollutant loadings are a function of both runoff volume and concentration. The volume of runoff is directly related to the amount of impervious surface from a particular land use. For example, if a fictitious Area A has twice the runoff due to higher impervious land cover as Area B with the same pollutant concentration, Area A will have twice the pollutant loading. This is the basis for the major difference in water quality between residential and commercial land uses and affects surface water planning strategies for the different land uses. The Minnesota Land Cover Classification System (MLCCS) cover types for the Ramsey area are shown in Figure 26C. 9. Water -based Recreation Areas and Land Ownership Figure 6 — Parks Map shows the location of all Parks and the location of all DNR public water accesses within the City of Ramsey. 10. Fish and Wildlife Habitat The City of Ramsey has applied to the DNR for an updated list and description of the conclusions and recommendations of biological surveys or reconnaissance studies in December of 2014. Since this list is sensitive it is not included in this report, but is on file in the office of the City Engineer. 11. Unique Features and Scenic Areas The Mississippi and Rum River Corridors within the City are unique and valuable local, state, regional and national resources. The rivers are an essential element in the local, regional, state and national transportation, sewer and water and recreational systems and serve important biological and ecological functions. The prevention and mitigation of irreversible damage to these resources and the preservation and enhancement of their natural, aesthetic, cultural and historic values is in furtherance of the health, safety and general welfare of the City. The Mississippi River Corridor Critical Area and the Rum River Scenic River are Section IV March 20, 2015 Page 19