Forest Acres Drainage Improvement Project

Project Overview

Due to its location and topography, the Forest Acres drainage basin and, to a lesser extent, the 5th Avenue drainage basin experience flooding during heavy or repeated moderate rain events. The flooding has come into homes causing extensive damage and creating dangerous conditions within the neighborhoods for drivers and pedestrians. While the Forest Acres drainage basin is currently served by a stormwater pump station, it is outdated, outmoded, and undersized.

During the conceptual design phase, it was determined that the system could be safely and efficiently drained using a gravity system. The new system will consist of stormwater channels and dual box culverts along the West Ashley Bikeway, under St. Andrews Boulevard, and under 5th Avenue. This system offers the same level of protection to the properties in the drainage basin as a modern pumped system would, but has the added benefit of not relying on electric power. Therefore, if power is lost during a rain event, the system will continue to drain under the force of gravity.

Currently, construction of the initial phase (Phase 1) of the Forest Acres Drainage Improvement Project is complete and the project team is working on Phases 2A (Phase 1 up to and including Playground Road) and Phase 2B (upstream of Playground Road). 

Video of Phase 1 developed by Thomas & Hutton