A hydraulic analysis of the Mad River in a reach at Springfield, Ohio was made to determine the effects of relocating State Highway 41 in 1976. The main channel was cleaned by the dredging in the vicinity of the new highway bridge and at the Detroit, Toledo and Ironton Railway bridge upstream. The new highway was placed on a high fill with relief structures for flood plain drainage consisting of 12-foot corrugated metal pipe culvert and a bridge opening to accommodate the Detroit, Toledo and Ironton Railway and a property access road. The effect of the new highway embankment on drainage from the flood plain was requested. Also requested was the effect that might be expected on the elevation of flood waters above the new highway embankment if the access road through the new highway embankment were raised.
The study indicates that the improvement in the capacity of the main channel to carry water was such that, up to discharge equivalent to a 25-year frequency flood, the water-surface elevation in the reach upstream from the Detroit, Toledo and Ironton Railway bridge would be about 0.6 foot lower than under condition prior to the construction on State Highway 41. Diversion through the Mad River left bank levee break above the Detroit, Toledo and Ironton Railway bridge to the flood plain would be decreased about one-half in terms of rate of discharge in cubic feet per second. The maximum difference in elevation of the flood water between the upstream and downstream side of the new State Highway 41 embankment would be about 0.2 foot, with and additional 0.4 foot to be expected if the access road were raised 1.5 feet.
Additional Publication Details
USGS Numbered Series
Hydraulic analysis, Mad River at State Highway 41, Springfield, Ohio
U.S. Geological Survey,
iv, 25 p. :ill., map ;27 cm.; (26 p., 12 figs., 5 tables - PGS)