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2. STORM SEWERS STORM The City of Ramsey has not had the need for storm sewers because SEWER residential densities have been low enough to use surface drainage. a. Inventory With lower residential densities, the City of Ramsey has used a rural design for their roads which uses ditch drainage rather than storm sewers. As development increased, it became apparent that the present method of handling storm water run -off was not adequate. As a result the City of Rmasey has completed and adopted a storm drainage plan which divides the community into seven drainage districts. The seven districts includes all of the urban and most of the area within the MWCC Sewer District No. 3 boundary which is ultimately programmed for sanitary sewer. The drainage plan includes the following information: 1) Identification of streams, channels, and rivers. By identi- fying existing natural features, it is possible to reduce expenditures for storm sewer pipes. Identification of ponds and wetlands. Using existing or man -made depressions as part of the storm sewer system reduces the maximum flow, in turn reducing pipe size and cost. In addition, water quality is improved because those ponds act as settling areas for material suspended in the water. The Comprehensive Storm Drainage Plan for Ramsey deals exclusively with public facilities (pipes, channels, ponding basins, etc.). For commercial, industrial development, and multi- family develop- ment, the City can develop requirements for some on -site retention. These might include: 1) Provide temporary retention ponding areas on parking lots. 2) Provide temporary retention ponding in parking median or planting areas. 3) Provide temporary roof -top retention facilities on new buildings. STORM As Ramsey develops, additional needs for municipal utilities SEWER arise. One of the most critical of these needs is in the area of b. Plan storm water control. To facilitate the handling of this storm water, the City has adopted a Comprehensive Storm Drainage Plan. Such a plan is needed for all areas of the City except the area outside the MWCC Sanitary Sewer District No. 3 boundary. The storm drainage plan provides a satisfactory storm water collection system for the City of Ramsey, making use of an abundance of wetlands and .watercourses in the City. The plan, allows for the orderly construction of the storm drainage system