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<br />peak stormwater flows; retention of wetland, habitat, and open space functions; <br />and reduced capital costs for stormwater facilities. <br /> <br />20. 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 />21. 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 />22. 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 />23. 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 hydro graph of the river.- <br /> <br />Policies <br /> <br />G.14 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 />e. Require on-site controls and development standards, as practical, to reduce <br />off-site impacts from stormwater runoff; <br /> <br />Appendix Aa Page 8 <br />