Water quality and flood control project that consisted of field surveys, hydrologic and hydraulic models, design alternates, public involvement, cost estimates, construction drawings, and bid documents.
The purpose of the project was to develop solutions to eliminate frequent house flooding in an urban area of Rock Hill. The watershed area is 467 acres and the drainage system consists of 3500 linear feet of open channels, seven roadway culverts, and 600 linear feet of closed pipe systems. Hydrologic and hydraulic models were created using the Corp of Engineers HEC-1 Flood Hydrograph Package, HY8 FHWA Culvert Analysis Package, Corp of Engineers HEC-RAS hydraulic analysis program, and XP-SWMM.
Improvements included the replacement of seven roadway culverts, up-sizing existing closed pipe systems, channel widening, and tunneling through a railroad embankment. Approximately 1300 LF of stream channel was restored. Proposed water quality improvements include installing storm water filtration units, installing a vegetated Geoweb retaining wall along the stream banks, and replacing existing cast iron sewer laterals with ductile iron pipe. Project duration: June 1999 to August 2004. Construction cost was $1,500,000.