Case study | Water Resources
US 50 Location Drainage Study
Details
Owner
Illinois Department of Transportation
Client
AMEC
Project Cost
$38,000
Status
Completed October 2011
Summary
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.
Project
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.
