IDLEWILD DRIVE SUBDIVISION STORM SEWER IMPROVEMENTS

In addition to implementing a stormwater management system to minimize flooding in the subdivision, the Idlewild Stormwater Improvement Project incorporates sustainable green design concepts that go hand in hand with the Mayor’s goals for a “greener” Columbus. The project includes design of a stormwater quality/detention basin that will utilize a low flow channel wetland concept to filter stormwater. The wetland is configured with an upper tier that treats stormwater from a 20-acre commercial development immediately upstream. The outlet structure for the upper tier wetland is designed to retain stormwater for the required 24-48 hours to permit settlement of suspended grit from the upstream commercial development. The lower tier wetland/basin maintains the existing stream channel and provides for flows above bankfull conditions. The lower tier wetlands provides water quality treatment as well. The outlet structure for the entire basin is designed with close coordination with OEPA and ODNR who wish to maintain bankfull flows while meeting the water quality discharge rates. The wetlands were configured with input from the Division of Parks and Recreation, who will utilize the basin for Public education by incorporating educational signage and kiosks along the proposed basin walking trails. This Division cooperation will provide much needed neighborhood park space while meeting the stormwater quality and quantity objective. In addition to the above, this project will implement the following: · Reduce pollution from construction activities by controlling erosion, sedimentation, and dust generation. · Restore approximately 2,000 LF of stream while preserving many tree species and restoring damaged areas to promote biodiversity. · Reduce water pollution by creating approximately 3 acres of high category wetlands that will increase infiltration, eliminate contaminants, provide habitat and promote biodiversity.