Green Infrastructure for Municipalities in New York s Lake Champlain Basin

Transcription

1 Green Infrastructure for Municipalities in New York s Lake Champlain Basin Rural Roads

2 Manual Download If you haven t already, download the manual: View Past Webinars on YouTube: Or just search Lake Champlain Basin Program YouTube Download the New York Rural Roads Active Management Plan Manual (RRAMP) 6/22/2017 2

3 Rural Roads - Overview Introduction Overview of Issues Associated with Rural Roads Opportunities and Challenges Auxiliary Benefits Practice Selection Case Studies Featured Case Study Rachel Beauregard, VT BBR Program Summary 6/22/2017 3

4 Rural Roads - Introduction Gravel is pervious right? Sadly, no. Gravel roads are too compacted. 6/22/2017 4

5 Rural Roads - Introduction Gravel roads frequently cross many small streams This leads to pollutant transport 6/22/2017 5

6 Rural Roads Poll Question! Does your community have these types of roads and do you have frequent erosion issues with them? Type your answer in the Chat Box on the righthand side of the screen. 6/22/2017 6

7 Rural Roads Stormwater Issues Common Issues Associated with Rural Roads Stormwater Hydrocarbons / Heavy Metals From Cars Organic Deposition (Phosphorus) 6/22/2017 7

8 Rural Roads Stormwater Issues Common Issues Associated with Rural Roads Stormwater Road Shoulder Erosion Road Surface Erosion Ditch Erosion 6/22/2017 8

9 Rural Roads Stormwater Issues Common Issues Associated with Rural Roads Stormwater Flow Increases Pre-Road Development Post-Road Development 6/22/2017 9

10 Rural Roads Opportunities and Challenges Opportunities Typically more open space to work with Practices can often be located ONLY within the road ROW Practices are simple to install Stone armoring, check dams, road re-surfacing, re-grading ditches Challenges Roads are often remote material transport can be hard Roads are often steep Can be constrained by steep slopes on both sides hard to install practices 6/22/

11 Rural Roads Auxiliary Benefits Benefits Practices that improve water quality can improve road durability and resilience less erosion Less erosion means infrastructure protection culverts will last longer Less material will be needed for road reconstruction 6/22/

12 Confined Area Impervious Cover Reduction Rain Garden / Bioretention Captures and filters road runoff; creates wildlife habitat O&M: Road Surfacing Rural Roads Practice Selection Managing a rural road Preservation of Natural Features Unconfined Area Stone Armored Swales Unpaved Culvert Outlet Plunge Pools Regulates runoff velocity and reduces erosion; improves wildlife habitat O&M: Check Dams Operation and Maintenance (O&M) Requirements: Minimal: Moderate: High: Stonearmored Turnouts Directs stormwater off of roads to stable stone-armored areas; prevents erosion O&M: Water Bars Decision Tree (pg. 4) 1) Start by deciding if you can reduce impervious cover (reduce road width or length) or preserve natural features on-site 2) Do you have a confined or unconfined area? 3) If it s confined you ll be working on the surface or in the ditches. 4) If it s not you can install practices outside the road ROW like turnouts, plunge pools, or other infiltration or sedimentation practices. Correct crowning and stable surface materials prevent erosion and improve driving conditions O&M: Lowmaintenance; redirects, slows, and filters stormwater O&M: Slows, and filters stormwater; can be incorporated into existing ditches and swales O&M: Directs stormwater off of unpaved roads to stable vegetated areas; prevents erosion O&M: This Will Guide Your Design Process. 6/22/

13 Rural Roads Practice Selection Outlet Protection Benefits: 1. Reduces water velocity 2. Controls erosion / encourages sedimentation 6/22/

14 Rural Roads Practice Selection Road Surfacing Benefits: 1. Sheds runoff better 2. Reduces risk of erosion 3. Better material = better durability (and maintenance of road shape) 6/22/

15 Rural Roads Practice Selection Stone Armoring Benefits: 1. Hardens surfaces prevents erosion in ditches 2. Filters out sediment (entrapment) 6/22/

16 Rural Roads Practice Selection Stone Check Dams Check Dam Swale Slope (%) Spacing (ft) Benefits: 1. Slows and filters in-ditch runoff 2. Prevents erosion 6/22/

17 Rural Roads Practice Selection Water Bars Benefits: 1. Direct water off road surface 2. Reduces surface erosion by breaking up road in to smaller segments 6/22/

18 Rural Roads Case Studies East Burke, VT Turnouts, stone armoring, road re-shaping Mad River Valley, VT Stone armoring, road re-shaping, impervious reduction 6/22/

19 Rural Roads Poll Question! Which of these practices would you be most likely to implement and why?? Road Outlet Protection Road Surfacing (including material addition) Stone Armoring Stone Check Dams Water Bars Type your answers in the Chat Box on the right-hand side of the screen. 6/22/

20 Rural Roads Featured Case Study Vermont s Better Backroads Manual New York s Rural Roads Active Management Plan Manual (RRAMP) is based on this 6/22/

21 Rural Roads Questions for Rachel? Type your questions in the Chat Box in the right-hand side of the screen. 6/22/

22 Rural Roads - Summary Managing rural roads runoff is important in protection smaller sensitive streams from sediment and other pollutants Practices that are good for water quality can be good for road durability 6/22/

23 Webinar Series June : Parking Lots and Hardscapes July : Building Development 6/22/