Water Quality BMPs Near Airports - Sam Jacoby, SSE Nov 2010

1. Water Quality BMPs
Near Airports
Sam Jacoby, P.E.
Stormwater Solutions Engineering
Meeting Stormwater Runoff Quality
Requirements Near Airports

2. Contents
• Corridor Overview
• Need For Water Quality
• Design Examples
– BMP Analysis
– Vegetation Choices
Meeting Stormwater Runoff Quality
Requirements Near Airports

3. Milwaukee County
Corridor Highlights
• Project Corridor in
Milwaukee County
– County Line
– To North of Mitchell
Interchange
– BMPs Within Airport
Concern Area
• 6 Dry Detention Basins
• 5 Biofiltration Devices
• Porous Asphalt Parking Lot
• 2 Stream Relocation
• Floodplain Reconnection
Meeting Stormwater Runoff Quality
Requirements Near Airports

4. Trans 401 Requirements
• Trans 401.106 Post-construction performance
standard
– (3) Total Suspended Solids
• (b) Reconstruction
– 40% TSS Reduction
– Corridor-Wide 40% Requirement
• (State Line to Mitchell)
Meeting Stormwater Runoff Quality
Requirements Near Airports

5. Current Final
Design Projects
• Airport Spur
• South Milwaukee
County Mainline
• Rawson
• Ryan Road
Interchange
Meeting Stormwater Runoff Quality
Requirements Near Airports

6. Ryan Road
Dry Detention Interchange
Bioswale
Porous Pavement
Biofiltration
Dry Detention
Stream
Relocation
Floodplain
Reconnection
Meeting Stormwater Runoff Quality
Requirements Near Airports

7. Airport Spur Project
• The Bad • The Good
– Limited R/W – Wide Ditch System
– Steep embankments • The Solution
• 2.5:1, in excess of 10’ – 3 Biofiltration Devices
vertical
Meeting Stormwater Runoff Quality
Requirements Near Airports

8. Airport Spur Project
• Biofiltration Devices:
Biofiltration Device
– #1 near railroad
Locations
intersection
– #2 at intersection of 6th
and Grange
– #3 within spur median
near Howell
Meeting Stormwater Runoff Quality
Requirements Near Airports

9. Right of
Way Biofiltration
Device #1
Emergency
Spillway
Outlet Structure
600-ft of
Roadway and
ROW
1-ft Ponding
Depth
Underdrain &
Storage Layer
Meeting Stormwater Runoff Quality
Requirements Near Airports

10. Airport Spur Project
Biofiltration Device #1
Biofiltration Device
#1 Location
Biofiltration Device
#1 Location
Meeting Stormwater Runoff Quality
Requirements Near Airports

11. Airport Spur Project
Biofiltration Device #1
Biofiltration Device
#1 Location
Meeting Stormwater Runoff Quality
Requirements Near Airports

12. Airport Spur Project
Biofiltration Device Summary
• 60% combined TSS reduction from three Spur
Biofiltration devices
• Less than 24-Hour Drain Time
Meeting Stormwater Runoff Quality
Requirements Near Airports

13. Airport Spur Project
Vegetation
• Wildflowers such as
Black Eyed Boneset Golden Blue Flag Iris New England
Susan Alexsander Aster
Live plants supplemented with WisDOT Seed Mix No. 75
Meeting Stormwater Runoff Quality
Requirements Near Airports

14. Airport Spur Project
Vegetation
• Grasses, Sedges & Rushes such as
Fox Sedge Big Bluestem Blue Fescue Dark Green Porcupine
Bulrush Sedge
http://www.co.washburn.wi.us/departments/landwatercons/info/planting/grasses/identification.htm
Meeting Stormwater Runoff Quality
Requirements Near Airports

15. Summary
• Water Quality Goals Can Be Achieved
• Drain down of Standing Water Limits the
Attractiveness of Biofiltration devices for
Migratory Birds
Meeting Stormwater Runoff Quality
Requirements Near Airports

16. Questions?
Meeting Stormwater Runoff Quality
Requirements Near Airports