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BMP Descriptions <br />The pollutant removal potential of permeable check dams was estimated using WinSLAMM. The <br />ponding volume behind the dams was determined using LIDAR. Based on results of other IESFs, it was <br />assumed that 80% of DP flowing through the dam was retained (Erickson & Gulliver, 2010). In order to <br />calculate cost -benefit, the cost of each project had to be estimated. To fully estimate the cost of project <br />installation, labor costs for project outreach, promotion, design, administration, and maintenance over <br />the anticipated life of the practice were considered in addition to actual construction costs. Load <br />reduction estimates for these projects are noted in the Catchment Profiles section. <br />City of Ramsey Stormwater Retrofit Analysis <br />