Coastal Georgia Stormwater Issues for Highways, Roads, and Bridges. Brad McManus, PE GDOT Water Resources Group Manager
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1 Coastal Georgia Stormwater Issues for Highways, Roads, and Bridges Brad McManus, PE GDOT Water Resources Group Manager for: The Georgia Environmental Conference August 25, 2016
2 Overview of Presentation Where to find material on Stormwater Training Sessions Offered by GDOT Discuss Planning and SiNng/Design
3 Materials Georgia Stormwater Management Manual stormwater- manual Drainage Design for Highways Manual for Erosion and Sediment Control in Georgia 2016 hrps://gaswcc.georgia.gov/technical- guidance- 0 Other sources: Center for Watershed ProtecNon ( NCHRP (53,83, and 92)
4 GDOT Education 3 X 5 cards
5 GDOT Education Brochures at Welcome Centers
6 GDOT Training Post ConstrucNon Stormwater for designer Advanced Design Workshops Stormwater 101 for managers FaciliNes Stormwater PolluNon PrevenNon Plan for GDOT Maintenance InspecNon and Maintenance for GDOT Maintenance ConstrucNon Engineering and InspecNon for GDOT ConstrucNon personnel Worksite Erosion Control Supervisor for Contractors and GDOT ConstrucNon Personnel
7 Planning and Siting/Design Three IniNal Planning Concepts to Consider: 1. AVOID disturbing environmentally sensinve areas 2. MINIMIZE overall disturbed area 3. REDUCE footprint when possible These are steps that GDOT is already taking to lower costs. How does this apply to MS4?
8 Stormwater Planning and Management Design approaches to be applied: Low Impact Development (LID) pracnces Green Infrastructure (GI) pracnces ConstrucNon stormwater controls Post- construcnon stormwater controls
9 Planning and Siting/Design Low Impact Development (LID): A management approach and set of pracnces that can reduce runoff and pollutant loadings by managing runoff as close to its source(s) as possible.
10 Planning and Siting/Design Common LID PracNces include: Avoiding environmentally sensinve areas Reducing project footprint Minimizing site impacts AdjusNng the design with the terrain IncorporaNng WQ early in planning Recycled materials SelecNng rural roadway secnon in place of urban
11 Planning and Siting/Design Green Infrastructure (GI): An adaptable term used to describe an array of products, technologies, and pracnces that use natural systems or engineered systems that mimic natural processes to enhance overall environmental quality and provide unlity services.
12 Planning and Siting/Design Common GI PracNces Include InfiltraNon and evapotranspiranon Porous pavements such as open graded fricnon course (OGFC) and porous European mix (PEM) Reuse and recycling (asphalt or concrete) Considering water quality early in the planning process
13 Planning and Siting/Design Other Planning ConsideraNons: Site specific constraints Available R/W LocaNon of other public infrastructure Hazardous or dangerous site condinons Access for construcnon and maintenance Cost of construcnon and maintenance
14 Planning and Siting/Design Benefits of Early Planning Improved understanding of project requirements Improved communicanon with involved parnes Cost savings Less chance of a stormwater related re- design
15 Planning and Siting/Design Primary Planning Resources: (Check dates) GDOT Guidelines for the Design of Post- ConstrucNon BMPs (February 2013) GDOT Drainage Manual (September 2014) MS4 Infeasibility Concept Report Checklist GDOT Post- ConstrucNon Stormwater Report Georgia Stormwater Management Manual (2016 version)
16 Post-Construction Stormwater BMPs Filter Strip Description: Uniformly sloped and densely vegetated area designed to treat sheet flowing stormwater runoff CriNcal Dimensions: LENGTH in the direcnon of flow WIDTH begin stanon to end stanon SLOPE in the direcnon of flow
17 Filter Strip
18 Filter Strip
19 Post-Construction Stormwater BMPs Grass Channel Description: A vegetated channel designed to enhance water quality through the settling of suspended solids CriNcal Dimensions: LENGTH in the direcnon of flow WIDTH base width of channel SLOPE in the direcnon of flow
20 Grass Channel
21 Grass Channel
22 Other GDOT Post-Construction BMPs Enhanced Swale InfiltraNon Trench Bioslope Sand Filter BioretenNon Basin Dry DetenNon Basin Wet DetenNon Pond Stormwater Wetland Open Graded FricNon Course (OGFC) These are found in Chapter 10 of GDOT s Drainage Manual. They have frequent maintenance schedules and costs.
23 Questions Brad McManus MS4 Program Manager Office of Design Policy and Support
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