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07/26/2000 Env Bd Packet
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07/26/2000 Env Bd Packet
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Environmental Board
Env Bd Document Type
Env Bd Packet
Meeting Date
07/26/2000
Env Bd Meeting Type
Regular
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WHAT YOU CAN Do <br />Without a doubt, the control of impervious <br />surfaces is most effectively addressed at the <br />city and township level. By the time a <br />development plat or street construction plan <br />reaches the District, it is often too late to <br />economically incorporate large design <br />revisions. - <br />Municipalities and local governmental units <br />can help by: <br />1. UPDATING ORDINANCES <br />Ordinances can be redefined to reduce <br />pervious surface losses during development <br />and to preserve infiltration. Examples <br />include: <br />• Zoning, which set maximum impervious <br />limits. <br />• Landscaping ordinances, which create <br />areas where stormwater can infiltrate. <br />• Stormwater management, requirements <br />for development to control runoff volumes <br />in addition to runoff rates. <br />• Promoting cluster development reduces <br />the amount of road surfaces needed for the <br />community. Added benefits are: <br />O Reduced capital cost of development <br />(10 to 33 %). <br />o Reduced site imperviousness (10 to <br />50%). <br />o Reduced size and cost of stormwater <br />quantity and quality controls. <br />2. REVISING STANDARDS <br />Standards can be revised to minimize <br />impervious surfaces. Examples include: <br />• Parking lot standards to reduce paved <br />areas that contribute to runoff. Some <br />standards to consider are: <br />Use of overflow lots with more <br />permeable surfaces. <br />Shared lots for businesses with <br />different peak operation times. <br />Smaller parking stall dimensions. <br />Reduced number of parking stalls <br />required for each land use. <br />Many commercial parking lots are over <br />designed with around 20% excess <br />capacity during normal peak usage. <br />• Street width standards can allow for <br />variable widths based on traffic counts. <br />" Narrower streets mean less impervious <br />area and less construction and <br />maintenance costs. <br />Mature tree loss is reduced. <br />Reducing road width • by 6 ft can <br />reduce road contributions to <br />impervious surfaces by 15 %. <br />
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