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<br />INGERSON PROJECT REVIEW GROUP RECOMMENDA TJONS <br /> <br />Even with the best management practices (BMP) cnforced, moderate levels of impervious <br />surfaees bloek the natural infiltration of stormwater into the grOlmd and increase the amount of <br />pollutants eolleeted and accumulated which are eventually transported to aquatie systems.28 <br /> <br />. <br /> <br />Many communities require that residential streets be 36 feet wide or more, even when <br />they serve developments that produce small volumes oftraffic. These wide streets result <br />from blanket application of high volume and high speed highway design eriteria, as well <br />as a perceived need to supply both on-street parking and unobstrueted access for fire <br />trueks. However, residential streets are often unneeessarily wide and the exeessive <br />widths contribute to making them the largest single eomponent of impervious cover in a <br />subdivision. Narrowing residential street widths can help reduce the amount of <br />impervious cover ereated by excessive street widths requirements.29 <br /> <br />Minimizing imperviousness, which is prevention focused, is more cost-effeetive than <br />treating stormwater runoff and much more eost-effective than restoring waterbodies after <br />they have been polluted or damaged.3o <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.31 According to Derek . <br />Knapp, P.E., Montgomery Watson, consulting engineering for the Rice Creek Watershed <br /> <br />28 Landscave Practices. The Rouf!e River Proiect, <br />https:/ /www.Waynecounty.com/rougcriver/ getinvol/tipland.html, National Resources Defense <br />Council. Inc., http:/www.nrdc.org and The Imvortance oflmverviousness. Watershed Protection <br />Techniques, Vol. I, No.3, Fall 1994. <br />29 Better Site Desif!n, supra. <br />30 Better Site Desif!n: A Handbook for Chanf!inf! Develovment Rules in Your Communitv. <br />August, 1998 and Consensus A~reement On Model Develovment Princivles to Protect Our <br />Streams. Lakes and Wetlands. April, 1998, Center for Watershed Protection <br />J] April 4, 2000 Review Group Meeting, Slide: Typical changes in runoff flows resulting from . <br />paved surfaces. <br /> <br />14 <br /> <br />August 17, 2000 <br />