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fines*** <br /> In Area of <br /> (Moor"'Ou" <br /> Rurtacos <br /> Reduced lactose ad Runoff <br /> Inffitration Runoff Pellntlen <br /> More RroUen and -noreasod <br /> rreouent over- Increases load* of M. <br /> Lit <br /> In succeeded P. Pb, Cu. <br /> Saida Zn and SDD <br /> IF <br /> Red tied Reduction Flood strear s@aR snitches Deteriorstles <br /> of ay of OroaM Darass Ere*lea of stream* of <br /> Weather Wotor I and <br /> stream Health <br /> Sitcom Pt� Fuel; Reserve*@ <br /> Figure 2.Interaction of stormwater problems. <br /> A comprehensive strategy for stormwater man- and open space system that structures ex- <br /> agement implies pansion on the urban fringe and offers sec- <br /> 1)A joint approach for the following tasks: (a) ondary benefits by (a) providing a scenic <br /> controlling increases in runoff peaks,(b) prevent- setting for adjacent uses, (b) forming corn- <br /> ing losses in infiltration(c)controlling runoff pol- dors of natural areas for wildlife protection <br /> lution,and(d)reducing thermal pollution; and passive recreation, and(c) by separating <br /> 2) linking together a "aeatrnent trait" of urea and screening incompatible uses. <br /> sures with functions that complement each other <br /> to implement tasks shown above,and Intmwtiom Of stormwaftr problems <br /> 3) a clustering and combination of <br /> stormwater measures to form a vegetated ri- Stormwater yroblemssall relate to increas- <br /> parian greenway that, together with flood- es in impervious surfaces and tend to inter- <br /> plains and wetlands, form a stream valley act as Ffigure 2 illustrates. Fha effect is the <br /> conversion of "natural" streams into "urban" <br /> streams. Higher and more extended flooding <br /> Figure 3.Typical changes in runoff flows from paved surfaces affecting leads to streambank erosion and to the <br /> the water budget. "stumping" of streambanks. This in turn <br /> causes the toppling of riparian vegetation, <br /> t�rrMa �� loss of shade, stream warming, and reduced <br /> TMwSPIMAMI MM oxygen—carrying capacity. Sediments caused <br /> MATH L 1s-mx by erosion from streambanks and from con <br /> we PAVED struction sites combine with runoff pollu- <br /> COVEN SOFA* tants from paved surfaces: nitrogen, phos- <br /> phorus, lead, zinc, copper, and oxygen <br /> 3>� :t% consuming wastes. Through siltation, <br /> slUuor afrr <br /> n aimTM RMTRATgA 1/HtRI1TrS streams and reservoirs become shallow and <br /> 3r 31% more responsive to warming. These phe- <br /> nomena coincide with reduction of base <br /> flow, particularly in headwater streams, <br /> E u,_ 38 caused by the sealing of the ground with <br /> TRUVMATON EM111-IRATr■ impervious surfaces and the reduced infiltra- <br /> Ply® 75—I09% tion of precipitation. All of these conditions <br /> 3311 Ruoff 31AIPRCEE SS%RUNOFF sUR lead to a deterioration of stream health. <br /> Im O% <br /> Storm sewers' effect on water quality is <br /> TOR mtr SKAtler Der shown by differences in streambeds at their <br /> SIULLOW ORLTRAnDs gfSTRATRIO INFURATOM <br /> OFMATON 15% point of discharge, expressed in benthic <br /> 3@ra,J.T.ToarMr and R.restmaaatt,tratar Awdrar Asia doll roaiaaYp:A Nri*st of A moray to Pr@taa WSW algal growth (caused by nutrients), organic <br /> Nowatatt is LAW <br /> °"i1"'ort r•3. slime on rock (caused by carbon), discol- <br /> ored or black stones upon turning (caused <br /> 16 JOURNAL OF SOIL AND WATER CONSERVATION <br />