The City of Charleston and its engineering consultant, Thomas and Hutton, have worked over the past several years to develop an efficient and cost-effective drainage improvement plan for the Forest Acres and 5th Avenue drainage basins. The Forest Acres drainage basin has experienced significant flooding of roads and yards, and in some cases, flood waters have entered homes causing significant damage. See the flooding experienced in the Forest Acres drainage basin on August 28, 2012 (PDF).
View a map illustrating the two drainage basins.
The two drainage basins, Forest Acres and 5th Avenue, are interconnected by the existing, man-made drainage system that drains the Forest Acres drainage basin. The existing drainage system includes a pump station (with a single pump) and a mile-long, 48-inch outfall pipe to the Ashley River. The pump station is located near the intersection of Playground Road and the West Ashley Bikeway. The outfall pipe is buried along the West Ashley Bikeway from Playground Road to the Ashley River.
Working within the urban and suburban environments found in the Forest Acres and 5th Avenue drainage basins provide additional challenges in addressing the drainage and flooding issues. These challenges include existing utilities (water, sewer, gas, electrical, communications, cable television, etc.) that must be avoided or relocated, limited City owned property or easements for the construction of improvements, and provisions for maintenance of traffic. The planning, designing, permitting, and the construction of the Forest Acres Drainage Improvements project is an involved and lengthy process.
To date, the following activities have been conducted to allow for the construction of Phase 1 of the Forest Acres Drainage Improvements: