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<br />The Summer Ditch (originally constructed by miners in the 19th century to divert runoff from <br />mining claims) diverts upstream Spar Gulch runoff to Keno Gulch, Leonard Rice Consulting Water <br />Engineers estimated that the capacity of the Summer Ditch (as limited by inlet control on the <br />downstream 18-inch culvert) is II cfs, It was assumed that the entire runoff from Sub-basin 23 <br />flows into Sub-basin 24. <br /> <br />.1 <br />; <br /> <br />Based on the information gathered, WRC has identified nine general areas where runoff enters the <br />City from the mountains to the south. These areas correspond to low points on Sub-basins 13, 14, <br />15, and 16,20,9,6 and 5 (See Figures 2 and 3), Flow from Sub-basin 13, 14, and 15 is intercepted <br />by Ute A venue, continues to the northwest, eventually enters a major storm sewer trunk line along <br />Original Street, and passes through a series of water quality ponds before outfalling into the <br />Roaring Fork River. <br /> <br />Runoff from Sub-basin 16 does not appear to enter the City in a single concentrated channel. <br />However, the street layout, topography, and location of inlets and trunk lines indicate that runoff <br />from this sub-basin will concentrate at Durant A venue and Mill Street. Runofffrom Sub-basin 16 <br />enters the storm sewer trunk line along Mill Street prior to outfalling into the Roaring Fork River, <br /> <br />Similarly, runoff from Sub-basins 20, 9, 6, and 5 appears to lack a single well-defined point of <br />entry, Runofffrom Sub-basin 6 is partially impeded by the existing bike trail embankment. Runoff <br />from Sub-basin 5 is intercepted along Hopkins Avenue, Runofffrom these sub-basins is collected <br />by the streets and storm sewers in the southwest portion of Aspen and routed to the storm sewer <br />trunk line along Gannisch Street, This trunk line then empties into the Roaring Fork River. <br /> <br />Based on the information gathered, there appears to be four existing major outfalls to the Roaring <br />Fork River (Figures 5 and 6), These outfalls occur at the termination of storm sewer lines, which <br />extend along Spring Street, Mill Street, Gannisch Street, and Gillespie Street. <br /> <br />Existing storm sewer pipes range in size from 12 inches to 48 inches and vary in type from High- <br />Density Polyethylene (HOPE) plastic to reinforced concrete. The majority of the existing pipes <br />appear to be corrugated metal. <br /> <br />2 <br /> <br />i <br />i <br />, <br /> <br />-----~ <br />