Case study | Water Resources
10-1077.05 US 50 Location Drainage Study
Illinois Department of Transportation
Completed October 2011
Kaskaskia Engineering Group, LLC (KEG) prepared a Location Drainage Study in accordance with the IDOT Drainage Manual for improvements on US 50 from Scott Troy Road to Quarry Road in O’Fallon, Illinois. The project consists of widening to construct a bi-directional turn lane on US 50 from 0.1 miles east of Scott Troy Road to 1.0 mile east of Scott Troy Road; widening to construct an eastbound left-turn lane on US 50 at Quarry Road, and resurfacing from 0.1 miles east of Scott Troy Road to 0.14 miles west of Quarry Road.
KEG analyzed the existing and proposed drainage system, including 2.4 miles of roadside ditches, thirty-seven (37) entrance culverts, and three (3) crossroad culverts. Peak runoff was calculated under existing and proposed conditions for the 2-year, 10-year, 25-year, 50-year, 100-year, and 500-year storm events. Recommendations were made for ditch design, culvert design, and treatments to minimize erosion.
The Location Drainage Study was approved by IDOT with only one minor comment.
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Maggie & LeoMatt Masterson
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