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<br />. <br /> <br />, <br /> <br />. <br /> <br />bridges, culverts and roads were also determined. Cross sections <br />were selected based on changes in natural water-way geometry, man- <br />made obstructions and reach distances. In general, cross sections <br />were located and surveyed at all county roads. In all, over 13 <br />miles of cross sections were surveyed in the study area. Appendix <br />A contains ground profile data reduced from field survey notes for <br />compatibility for input to HEC-2. <br /> <br />1. HEC-2 Data Input <br /> <br />Data reduced from field survey notes was input to HEC-2. All cross <br />sections were keyed into HEC-2 as surveyed with exception to cross <br />sections immediately up-stream and down-stream of the Burlington <br />Northern Rail Road trestle and the Highway 6 bridge. These cross <br />sections were keyed into HEC-2 from ground profile data from <br />surveyed cross sections 2, 3 and 10. This approach was taken to <br />account for the flow split caused by the Highway 6 bridge and the <br />B&N R.R. trestle. Cross section 2.40, from the bridge west, <br />contains the ground elevations and stations of cross section 10, <br />and east of the bridge, contains the ground elevations and stations <br />from cross section 3 south of the rail road tracks. The cross <br />section just down-stream of the trestle, cross section 2.51, is a <br />hybrid of cross sections 3 and 2. The right bank of cross section <br />2.51 was keyed as the top of the rail road in order to determine <br />the right over-bank component (the flow which flows southeast <br />through Paoli). <br /> <br />All cross sections up-stream of the two bridges and the trestle <br />were duplicated at a distance one times the structure's water way <br />opening up-stream of the structure. Cross sections down-st~eam of <br />these structures were duplicated at four times the distance that <br />the structure's abutment encroached into the water way. These <br /> <br />Paoli Flood Study <br />September 29, 1991 <br /> <br />Hydraulic Analysis Report <br /> <br />-3- <br />