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RS&H provided design services to improve the SR 408/SR 417 interchange in Orange County, Florida, including basin delineation, stormwater management facility design, roadside swale design, storm sewer system design, culvert design and production of a stormwater management report. RS&H also provided environmental permitting services, which included obtaining an Individual Environmental Resource Permit from the St. Johns River Water Management District, as well as an Individual Section 404 Wetlands Permit from the U.S. Army Corps of Engineers.
RS&H designed 20 ponds to treat and attenuate stormwater runoff from the SR 408/SR 417 interchange and minimized pond earthwork by utilizing existing pond geometry and side slopes when possible. Existing pond outfall structures were also used when possible to reduce construction cost, and 12 existing ponds were retrofit to accommodate the new water quality and quantity requirements from the increased amount of impervious area. The team proposed eight new ponds within the right-of-way, as well as two temporary ponds, which were necessary for maintenance of traffic purposes. Four concrete box culverts that convey the E-40 and L-10 Canals through the interchange were extended to accommodate the widened roadway, and several other cross drains throughout the project were extended outside the clear zone due to the proposed widening.
The existing and proposed ponds were designed and analyzed using PONDS Version 3.2. The storm sewer conveyance system, cross drains, and side drains were designed using GeoPak Drainage 2001.
Orange County, Florida
Orlando-Orange County Expressway Authority
National Recognition Award
American Council of Engineering Companies (ACEC)
Engineering Excellence Awards, 2014
Best Highways/Bridges Project
ENR Southeast’s Best of 2013
Ranked Eight in Roads & Bridges Top 10 Roads of 2013