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<br />Attachment to Comments re: Stormwater Ordinance--Low Impac <br /> <br />Page 20f3 <br /> <br />...low-impact development site planning practices [include] <br />the following: <br /> <br />Narrower driveways and roads (minimizing impervious <br />areas) <br /> <br />Maximizing tree preservation or aforestation (tree <br />planting) <br /> <br />Site fingerprinting (minimal disturbance) <br /> <br />Open drainage swales <br /> <br />Preservation of soils with high infiltration rates to reduce <br />eN <br /> <br />Location of Integrated Management Practices (IMPs) on <br />high infiltration soils. <br /> <br />Excerpts from Pierce County, W A ordinance: <br /> <br />http://www.psat.wa.gov/Publications/LID_studies/ordinances_regulations.htm#ord4 <br /> <br />(page 9) Low impact development goal shall be achieved through adherence to the <br />following objectives... "Retain or restore native soils and vegetation on 65% of a site. Limit <br />effective impervious area to no more than 10%. Retain and incorporate natural site features <br />that promote infiltration of stormwater on a developed site. Use of traditional conveyance <br />and pond technologies to manage stormwater quality and quantity should only be <br />considered after all other LID techniques have been considered and used to the greatest <br />extent possible. Use bioretention...surface water dispersion, etc... as close to the origin as <br />possible. " <br /> <br />Low Impact Development: <br /> <br />"Primary objective is to retain native vegetation and soils. Retain watershed hydrology for <br />the health of aquatic systems and stormwater control. Reduce development envelope, <br />reduce total impervious surface, provide infiltration area, maintain most closely mimic <br />natural hydrologic function of site. Additional benefits are critical area habitat for wildlife, <br />open space corridors for passive recreation, visual buffers, and erosion and sediment <br />control. " <br /> <br />5/23/2006 <br />