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Updated Surface Water Management Plan (SWMP) <br />City of Ramsey, Minnesota <br />A. SCS 24-hour rainfall distributions (SCS, 1986): <br />B. Approximate geographic boundaries for SCS rainfall distributions (SCS, 1986): <br />KIJIltuf <br />Underdrain: Typically perforated plastic pipes installed on the bottom of a filtration of <br />infiltration BMP, or sand filter. The under drain is used to collect and remove treated <br />storm water that exceeds the water holding and/or infiltration capacity of the soil. <br />Upland: General term to describe any area that is not a wetland. <br />Vegetated Filter Strip: A vegetated section of land designed to accept runoff as <br />overland sheet flow from upstream development. It may adopt any natural vegetated <br />form, from grassy meadow to small forest. The dense vegetative cover facilitates <br />pollutant removal. Vegetated filter strips cannot treat high velocity flows; therefore, they <br />have generally been recommended for use in agriculture and low -density development. <br />A filter strip can also be an enhanced natural buffer, whereby the removal capability of <br />the natural buffer is improved through engineering and maintenance activities such as <br />land grading or the installation of a level spreader. A filter strip differs from a grassed <br />Section XI <br />March 20, 2015 Page 83 <br />