Transportation
Interchanges
“Lowcountry Corridor” I-526 Corridor Improvements between North Charleston & West Ashley
Solutions
The I-526 corridor improvement project includes adding a travel lane in each direction along I-526 and six interchange improvements. The field surveys included setting of project controls, coordination with aerial survey subconsultants, best fit of existing roadway alignments, courthouse research, property monument locations, property strip maps, supplemental 2D/3D mapping, drainage inlet/outfall surveys, drainage structure surveys, sanitary sewer surveys, wetlands surveys, geotechnical boring surveys, existing bridge verifications, railroad coordination/surveys, and traffic control coordination for interstate surveys.
Hydrologic and hydraulic analysis of corridor includes:
- Field investigation to inventory location and condition of existing cross lines, determine watershed boundaries, evaluate existing structure performance, and evaluate stability and capacity of drainage outfalls
- Data collection necessary to perform hydrologic and hydraulic analysis and design including stream gaging of Filbin and Bulls Creeks for model calibration
- Watershed regional hydrologic and hydraulic analysis of five major watersheds, 26 cross line pipe/culverts, pre- and post-construction flows, and detention analysis, among others
- 2D bridge hydraulic analysis of the General William C. Westmoreland Bridge over the Ashley River
Services Provided
- Field Surveys
- Hydrology & Hydraulic Design