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<br />INGERSON PROJECT REVIEW GROUP RECOMMENDA TIONS <br /> <br />. <br /> <br />Even with the best management practices (BMP) enforced, moderate levels of impervious <br />surfaces block the natural infiltration of stormwater into the ground and increase the amount of <br />pollutants collected and accumulated which are eventually transported to aquatic systems.28 <br /> <br />Many communities require that residential streets be 36 feet wide or more, even when <br />they serve developments that produce small volumes of traffic. These wide strects result <br />from blanket application of high volume and high speed highway design criteria, as well <br />as a perceived need to supply both on-street parking and unobstructed access for fire <br />trucks. However, residential streets are often unnecessarily wide and the excessive <br />widths contribute to making them the largest single component of impervious cover in a <br />subdivision. Narrowing residential street widths can help reduce the amount of <br />impervious cover created by excessive street widths requirements.29 <br /> <br />Minimizing imperviousness, which is prevention focused, is more cost-effective than <br />treating stormwater runoff and much more cost-effective than restoring waterbodies after <br />they have been polluted or damaged. 30 <br /> <br />According to Kate Drewry, Rice Creek Watershed District, District Administrator, the wider the <br />street the more impervious surface, which in turn creates more runoff and decrease of natural <br />infiltration. During her presentation to the Review Group, Ms. Drewry showed that the <br />percentage of runoff water increased dramatically and the percentage of infiltration decreased <br />dramatically when there was a higher percentage of paved surfaces.3! According to Derek <br />Knapp, P.E., Montgomery Watson, consulting engineering for the Rice Creek Watershed <br /> <br />. <br /> <br />28 Landscaoe Practices. The Roue-e River Proiect, <br />https://www.Waynecounty.com/rougeriver/ getinvol/tipland.htrnl, National Resources Defense <br />Council. Inc., http:lwww.nrdc.org and The Imoortance of Imoe",iousness, Watershed Protection <br />Techniques, Vol. I, No.3, Fall 1994. <br />29 Better Site Desie-n, supra. <br />30 Better Site Desie-n: A Handbook for Chane-in&, Develooment Rules in Your Communitv. <br />August, 1998 and Consensus Ae-reement On Model Develooment Princioles to Protect Our <br />Streams. Lakes and Wetlands. April, 1998, Center for Watershed Protection <br />Jl April 4, 2000 Review Group Meeting, Slide: Typical changes in runoff flows resulting from <br />paved surfaces. <br /> <br />. <br /> <br />14 <br /> <br />August 17, 2000 <br />