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<br />modified to reflect excavation of the channeL From County Road 19 <br />. to the B&N R.R. trestle, the channel was modified to provide an <br />invert slope 0.0047 starting at cross section 2. In this reach the <br />channel was also widened to 125 feet bottom width unless the <br />existing channel bottom with was greater than 125 feet, in which <br />case the channel width was unchanged. Also in this reach, the <br />right bank (looking down-stream) was levied to an elevation of 3906 <br />feet MSL. <br /> <br />. <br /> <br />The reach of the north channel between the trestle and County Road <br />21 was also modified by changing the existing ground surface <br />profile data to reflect a channel invert slope of 0.0014 starting <br />at the invert on the down-stream side of the trestle. Again, the <br />channel bottom width was excavated to 125 feet or existing bottom <br />width, which ever was greater. The bridge on County Road 21 was <br />modelled as a 125 foot long, 50 foot wide, three pier bridge. The <br />bottom cord elevation and top of road elevation was initialized at <br />an elevation which exceeded the water surface elevation at this <br />cross section, - thus the bridge was modelled as class A low flow. <br /> <br />The new Highway 6 bridge was widened to a width of 125 feet with <br />vertical abutments and an invert to low cord elevation difference <br />of 10.6 feet resulting in an effective flow area of 1282.5 square <br />feet when under full pressure flow. The rail road trestle was <br />widened to a width of 125 feet with vertical abutments and a invert <br />to low cord elevation difference equal to 11.1 feet resulting in an <br />effective flow area of 1383.0 square feet when under full pressure <br />flow. The top of the rail on the trestle and the top of the road <br />on the highway bridge remained the same as in the existing <br />conditions, 3906.7, and 3905.1 feet MSL resp~ctively. <br /> <br />Under this alternative, the channel modifications and new <br /> <br />. <br /> <br />Paoli Flood study <br />September 29, 1991 <br /> <br />Hydraulic Analysis Report <br /> <br />-8- <br />