Client: Virginia Department of Transportation

Our design team utilized an innovative, Low Impact Development (LID) design approach to address stormwater management on this 2.65 mile roadway expansion project. LID components included bioretention swales and filters, natural dispersion, level spreaders, stream buffer enhancement/reforestation, bioslopes, and extended detention. These LID facilities were some of the first included in a VDOT project. Comprehensive hydrologic and hydraulic floodplain analysis and LOMR evaluation were also performed as part of the design of the 164- ft. long arch bridge structure over Giles Run. Supplemental surveys of streams were performed for the roadway, structure and hydraulic design. These were used as delineation, joint permit applications, and supporting documentation for submittal to the USACE, DEQ, and VMRC. The documentation addressed on and off-site alternatives, purpose and need, avoidance and minimization alternatives, and proposed compensatory mitigation options.