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Comments were received seeking justification for additional stormwater detention…

  • July 31, 2019July 31, 2019
  • by Brandon Batt

As more lanes are added to SR 400 via the SR 400 Express Lanes project, additional stormwater runoff will occur along the corridor. Detention ponds are essential to reducing the risk of flooding on neighboring properties. The roadway’s drainage design will be brought to current standards, where possible, as part of the overall design process and conform to best management practices. The project corridor falls within a Municipal Separate Storm Sewer System (MS4) Permitted area which consists of a system of conveyances owned by the state or local municipalities that discharges to waters of the U.S. Therefore, this project is subject to the requirements of the MS4 Permit. The stipulations to comply with this permit will require treatment of the runoff and protection of area surface waters and water quality. To address drainage concerns, design features in this project include, but are not limited to: detention basins, curb inlets and pipes (e.g., a closed drainage system), and ditches along the corridor where feasible to convey stormwater away from the roadway.

The detention ponds are stormwater management systems that will be used to both remove some of the pollutants in the roadway runoff (improve water quality) during a storm as well as to prevent downstream flooding. They are not intended to be permanently wet but rather to detain the water and allow it to trickle out at a slow rate at or near the pre-widened roadway rate so as not to flood downstream. It is intended for these ponds to release all the water within 48 hours of most rain events and not to serve as permanently wet ponds. Stormwater retention ponds will include fencing to discourage unauthorized access to GDOT right-of-way.

The detention ponds are being designed by registered design professionals in accordance with GDOT policies and standards. All stream alignments will be designed to safely convey water back to the existing riverbed. As part of the installation of these basins, routine maintenance will be conducted. Being dry between rain events greatly reduces the attractiveness to nuisance species.

Requests were made to include local complete streets concepts including pedestrian and cycling infrastructure along the project.
Comments were made in both support of and against elevated lanes along the corridor.
GADeptofTrans avatarGeorgia DOT@GADeptofTrans·
11h 1383088238668222480

Was Snapfinger Creek in DeKalb County really named after a broken finger? Not sure about that, but we do know that a new bridge over the creek is part of the #28520EastInterchange improvements! Find out more at http://bit.ly/3aKSfbu

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GADeptofTrans avatarGeorgia DOT@GADeptofTrans·
15 Apr 1382755857553821701

Did you know? The innovative I-75 Commercial Vehicle Lanes project will improve safety for all drivers, reduce travel time, and help Georgia’s economy by creating a more connected transportation network. Learn more at
https://majormobilityga.com/projects/i75cvl/

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lutzie43 avatarLutzie 43 Foundation@lutzie43·
14 Apr 1382396450127151110

@NSCsafety Distracted driving can be eating & drinking, talking with people in the car, messing with the stereo, daydreaming, or anything that takes your attention away from the task of safe driving. Go to to learn more about distracted driving. #JustDrive21

Lutzie 43 Foundation

lutzie43.org

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GADeptofTrans avatarGeorgia DOT@GADeptofTrans·
14 Apr 1382383892192198656

Happening Now: All lanes blocked I-85 NB at Flat Shoals Rd. Emergency personnel are on scene. Motorists are urged to seek alternate route. @GDOTATL #ATLTraffic @ajcwsbtraffic @WSBTraffic @FOX5Atlanta @11AliveTraffic @CBS46Traffic

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GADeptofTrans avatarGeorgia DOT@GADeptofTrans·
14 Apr 1382351889598185477

Daytime Paving Operations on SR 166 at Boat Rock, New Hope Roads Begin Next Week -

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