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lg9. There are many advantages to keeping channels open, including, at a minimum, <br /> natural biofiltration of stormwater pollutants; greater ability to attenuate effects of <br /> peak stormwater flows; retention of wetland, habitat, and open space functions; <br /> and reduced capital costs for stormwater facilities. <br /> <br />-1-820. An increase in impervious surfaces, without mitigation, results in higher flows <br /> during peak storm events, less opportunity for recharging of the aquifer, and a <br /> decrease in water quality. <br /> <br />-1921. Stormwater systems tend to be gravity-based systems that follow the slope of the <br /> land rather than political boundaries. In many cases, the natural drainageways <br /> such as streams serve as an integral part of the stormwater conveyance system. <br /> <br />202. In general, there are no programs for stormwater maintenance outside the Eugene <br /> and Springfield city limits, except for the Lane County roads program. State law <br /> limits county road funds for stormwater projects to those located within the public <br /> right-of-way. <br /> <br />2-1-3. Filling in designated floodplain areas can increase flood elevations above the <br /> elevations predicted by Federal Emergency Management Agency (FEMA) <br /> models, because the FEMA models are typically based only on the extent of <br /> development at the time the modeling was conducted and do not take into account <br /> the ultimate buildout of the drainage area. This poses risks to other properties in <br /> or adjacent to floodplains and can change the hydrograph of the river.- <br /> <br />Policies <br /> <br />G. 134 Improve surface and ground water quality and quantity in the metropolitan area <br /> by developing regulations or instituting programs for stormwater to: <br /> <br /> a. Increase public awareness of techniques and practices private individuals <br /> can employ to help correct water quality and quantity problems; <br /> <br /> b. Improve management of industrial and commercial operations to reduce <br /> negative water quality and quantity impacts; <br /> <br /> c. Regulate site planning for new development and construction to better <br /> manage pre- and post-construction storm runoff, including erosion, <br /> velocity, pollutant loading, and drainage; <br /> <br /> d. Increase storage and retention and natural filtration of storm runoff to <br /> lower and delay peak storm flows and to settle out pollutants prior to <br /> discharge into regulated waterways; <br /> <br /> Appendix Aa Page 8 <br /> <br /> <br />