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4.7 <br />"' 0 i4&01 <br />T R A\ C E <br />Bio-Swales <br />The Residential Collector roads within Trace shall have landscaped medians which can offer a <br />unique approach to water quality. Medians shall be inverted and will capture runoff from all ROW, <br />as the inside curb of both sides of traffic will be of the laydown or ribbon variety. This will allow <br />the roadway to sheet flow into the median, where vegetated infiltration strips can be utilized to <br />treat runoff. However, in cases where road grades exceed 8.5%, it is not feasible for the medians <br />to be utilized for water quality and <br />curb and gutter must be used. <br />Illustration 33: Typical Laydown or <br />Ribbon Curb and Bio -Swale <br />Typicsi Ribfrun Curb .. <br />—#4 ear—B2"C—ier(TYp.I <br />-• -- P�urvoVf Fi eo brzimape SwaNe <br />Mica. 2R, Sla <br />29, Subgrade <br />28 -bay Cams— St—g* = 7594 psi <br />37 <br />