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Urban Roadway Stormwater Runoff Quality

Stormwater Impacts from Urban

Roadways

Carrie Bristoll-Groll, PE, CFM

Principal

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Urban Roadway Stormwater Runoff Quality

Stormwater Impacts from Urban Roadways

Roadway Standards

Need For Water Quality

Design Examples

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Urban Roadway Stormwater Runoff Quality

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Urban Roadway Stormwater Runoff Quality

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Urban Roadway Stormwater Runoff Quality

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Urban Roadway Stormwater Runoff Quality

Roadway Drainage Design Guidelines

(abbreviated)

Water shall not pond on the driving lanes

The flow of water shall not create a spread(width of flow) that exceeds the shoulder

width in a 25-year storm event.

Storm sewer is designed to a 25-year stormevent, check no surcharging occurs at inlets

during a 50-year event.

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Urban Roadway Stormwater Runoff Quality

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Urban Roadway Stormwater Runoff Quality

Roadway Drainage Design Results

Stormwater runoff from roadwaysis getting to inlets as quickly and

efficiently as possible

Public safety is the #1 priority

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Urban Roadway Stormwater Runoff Quality

I-94 So. Milwaukee County Airport Spur

BMPs are Within

Airport Concern Area

5 Biofiltration Devices

Porous Asphalt and

PaveDrain Parking Lot

2 Stream Relocations

Floodplain

Reconnection

6 Dry Detention Basin

Vegetated swales

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Urban Roadway Stormwater Runoff Quality

I-94 So. Milwaukee County

Airport Spur

3 Biofiltration Devices

Vegetated swales

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Urban Roadway Stormwater Runoff Quality

Airport Spur Project

3 Biofiltration Devices

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Urban Roadway Stormwater Runoff Quality

Airport Spur Project

Biofiltration Devices: #1 near railroad

intersection

#2 at intersection of 6thand Grange

#3 within spur mediannear Howell

Biofiltration Device

Locations

Ri ht f

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Urban Roadway Stormwater Runoff Quality

Emergency

Spillway

Outlet Structure

1-ft Ponding

Depth

Underdrain &

Storage Layer

600-ft of

Roadway and

ROW

Right of

Way Biofiltration

Devices

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Urban Roadway Stormwater Runoff Quality

Biofiltration Device

#1 Location

Airport Spur ProjectBiofiltration Device #1

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Urban Roadway Stormwater Runoff Quality

Airport Spur ProjectBiofiltration Device

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Urban Roadway Stormwater Runoff Quality

Airport Spur ProjectBiofiltration Device-Fall Construction

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Urban Roadway Stormwater Runoff Quality

Airport Spur ProjectBiofiltration Device-Spring Runoff

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Urban Roadway Stormwater Runoff Quality

Airport Spur ProjectBiofiltration Device-Spring Runoff

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Urban Roadway Stormwater Runoff Quality

Airport Spur Project

Biofiltration Device Summary

60% combined TSS reduction from AirportSpur using three Biofiltration devices

Less than 24-Hour Drain Time

Maintenance to be performed by airport staff

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Urban Roadway Stormwater Runoff Quality

Airport Spur Project

Vegetation

Wildflowers such as

Black EyedSusan

Boneset GoldenAlexander

Blue Flag Iris New EnglandAster

Live plants supplemented with WisDOT Seed Mix No. 75

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Urban Roadway Stormwater Runoff Quality

Airport Spur Project

Vegetation

Grasses, Sedges & Rushes such as

Fox Sedge Big Bluestem Blue Fescue Dark GreenBulrush

PorcupineSedge

http://www.co.washburn.wi.us/departments/landwatercons/info/planting/grasses/identification.htm

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Urban Roadway Stormwater Runoff Quality

I-94 So. Milwaukee County Ryan Road

BMPs are Within

Airport Concern Area

5 Biofiltration Devices

Porous Asphalt and

PaveDrain Parking Lot 2 Stream Relocations

Floodplain

Reconnection

6 Dry Detention Basin

Vegetated swales

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Urban Roadway Stormwater Runoff Quality

I-94 So. Milwaukee County

Stream Relocations

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Urban Roadway Stormwater Runoff Quality

Ryan Road Park and RideCurrent Proposed Plan

1 bioswale

1 biofiltration device

Porous asphalt pavement Porous pavement system (PaveDrain)

Ryan Road

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Urban Roadway Stormwater Runoff Quality

Porous Pavement

Ryan Road

Interchange

Biofiltration

Bioswale

Dry Detention

Completed

Stream

Relocation

Future

Floodplain

Reconnection

Future Dry

Detention

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Urban Roadway Stormwater Runoff Quality

Ryan Road Park and RideCurrent Proposed Plan

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Urban Roadway Stormwater Runoff Quality

Ryan Road Park and RideCurrent Proposed Plan

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Urban Roadway Stormwater Runoff Quality

Ryan Road Park and RideCurrent Proposed Plan

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Urban Roadway Stormwater Runoff Quality

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Urban Roadway Stormwater Runoff Quality

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Urban Roadway Stormwater Runoff Quality

Ryan Road Park and RideBiofiltration with Native Vegetation

Live plants supplemented with WisDOT Seed Mix No. 75

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Urban Roadway Stormwater Runoff Quality

Ryan Road Park and RideCurrent Proposed Plan

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Urban Roadway Stormwater Runoff Quality

Ryan Road Park and RideCurrent Proposed Plan-

Porous Asphalt and PaveDrain Products

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Urban Roadway Stormwater Runoff Quality

Whats Next

TMDLs (Total Maximum Daily Loads)

Total Suspended Solids

Phosphorus

Bacteria

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Urban Roadway Stormwater Runoff Quality

Summary

Water quality goals can be achieved whileefficiently draining roadways and maintaining

safe driving conditions

All water quality BMPs mentioned complywith FAA Circular for stormwater treatment

near airports.

Maintenance is the key (both in terms ofissues and solutions!)

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Urban Roadway Stormwater Runoff Quality

Questions?

Thank you!

www.stormwater-solutions-engineering.com

moving to Water Council Building233 W. Pittsburgh St., Milwaukee

http://www.stormwater-solutions-engineering.com/http://www.stormwater-solutions-engineering.com/