Skip to content
MMIP
  • MMIP Home
  • Board
  • Employment
  • Blog
  • News
  • Contact Us
  • Projects
    • SR 400 Express Lanes
    • I-285/I-20 East Interchange
    • 16@95 Improvements
    • I-285/I-20 West Interchange
    • I-285 Eastside Express Lanes
    • I-285 Top End Express Lanes
    • I-285 Westside Express Lanes
    • I-75 Commercial Vehicle Lanes
    • I-85 Widening, Phase I
    • I-85 Widening, Phase II (SR 53 to US 129)
    • I-285 Advanced Projects
  • Georgia Express Lanes
Site Search

Comments were received seeking justification for additional stormwater detention…

  • July 31, 2019July 31, 2019
  • by Kailash Lala

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·
14h 1541097985437843458

As #NationalPollinatorWeek comes to a close we want to remind you of #WildflowerTags. Want to help create colorful roadsides along our state highway system? Purchase a Wildflower Tag! Proceeds go into a special fund dedicated to the Wildflower Program. https://bit.ly/3A3cVd2

Twitter feed video.
Image for the Tweet beginning: As #NationalPollinatorWeek comes to a
Reply on Twitter 1541097985437843458Retweet on Twitter 1541097985437843458Like on Twitter 15410979854378434582Twitter 1541097985437843458
GADeptofTrans avatarGeorgia DOT@GADeptofTrans·
25 Jun 1540720533448171520

Hello #SafetySaturday, share this tweet with a friend who needs it!
🚧⚠️

https://www.instagram.com/reel/CfO7-ODDDEF/?igshid=YmMyMTA2M2Y=

Twitter feed video.
Image for the Tweet beginning: Hello #SafetySaturday, share this tweet
Reply on Twitter 1540720533448171520Retweet on Twitter 1540720533448171520Like on Twitter 15407205334481715201Twitter 1540720533448171520
GADeptofTrans avatarGeorgia DOT@GADeptofTrans·
24 Jun 1540410482921701376

Let’s talk #Transform285400 benefits.
⬇️
Don’t forget to follow us on Instagram
https://www.instagram.com/reel/CfMuKnmDI5G/?igshid=YmMyMTA2M2Y=

Twitter feed video.
Image for the Tweet beginning: Let’s talk #Transform285400 benefits. 
⬇️
Don’t
Reply on Twitter 1540410482921701376Retweet on Twitter 1540410482921701376Like on Twitter 15404104829217013764Twitter 1540410482921701376
GADeptofTrans avatarGeorgia DOT@GADeptofTrans·
24 Jun 1540376974681845760

Have you checked out our latest blog about #NationalPollinatorWeek written by our #LandscapeArchitect, Chris DeGrace?! If not, 🐝 a 💻 🐛 and check it out! (*blog worm...can we make that a thing?) #extramileblog Comment below if you're a #blogworm💻 🐛
https://bit.ly/39Nfoh3

Twitter feed video.
Image for the Tweet beginning: Have you checked out our
Reply on Twitter 1540376974681845760Retweet on Twitter 15403769746818457601Like on Twitter 15403769746818457601Twitter 1540376974681845760
GADeptofTrans avatarGeorgia DOT@GADeptofTrans·
24 Jun 1540366506743267329

🎆🎇🚨

🎆🎇🚨
511 GA - A Service of Georgia DOT@511Georgia

511 is the #1 traffic source in Georgia, so why not use it to plan ahead for #July4th? See below on how to use #511GA for your travel needs.

Reply on Twitter 1540366506743267329Retweet on Twitter 1540366506743267329Like on Twitter 1540366506743267329Twitter 1540366506743267329
Load More...
© Georgia Department of Transportation All Rights Reserved | Privacy Notice