Vermont Stormwater Regulations And Low Impact Development Outline

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Vermont Stormwater Regulations And Low Impact Development

Vermont Stormwater Regulations And Low Impact Development

Outline • • The Vermont Stormwater Program Stormwater Management Manual LID Strategy? Future Standards

Outline • • The Vermont Stormwater Program Stormwater Management Manual LID Strategy? Future Standards

Stormwater Permit Programs • • • Construction Industrial Municipal Stormwater Discharge Impaired Waters Restoration

Stormwater Permit Programs • • • Construction Industrial Municipal Stormwater Discharge Impaired Waters Restoration

State Stormwater Permit • Discharges from Impervious Surfaces

State Stormwater Permit • Discharges from Impervious Surfaces

Projects Requiring State Stormwater Permit • 1 Ac. New Impervious Surface • Expansions >

Projects Requiring State Stormwater Permit • 1 Ac. New Impervious Surface • Expansions > 5, 000 ft 2

Technical Requirements • Developed by CWP • Adopted by VT Legislature

Technical Requirements • Developed by CWP • Adopted by VT Legislature

Technical Requirements • • 5 Criteria: Treatment Infiltration Detention of 1, 10, and 100

Technical Requirements • • 5 Criteria: Treatment Infiltration Detention of 1, 10, and 100 -year storms

Is it LID?

Is it LID?

Conventional Stormwater Management

Conventional Stormwater Management

LID

LID

Constructed Wetlands

Constructed Wetlands

Infiltration

Infiltration

Bioretention- Rain Garden

Bioretention- Rain Garden

• • CREDITS Natural Area Conservation Disconnection of Rooftop Runoff Disconnection of Non-Rooftop

• • CREDITS Natural Area Conservation Disconnection of Rooftop Runoff Disconnection of Non-Rooftop Runoff Stream Buffers Grass Channels Environmentally Sensitive Rural Development

Credits Treating at the Source

Credits Treating at the Source

Stream Buffer and Natural Area Credits

Stream Buffer and Natural Area Credits

Reducing Impervious Cover • Decrease in required volumes • Possible elimination of structural practices

Reducing Impervious Cover • Decrease in required volumes • Possible elimination of structural practices

Vermont Stormwater Management Manual • 500 + LID projects in 10 years?

Vermont Stormwater Management Manual • 500 + LID projects in 10 years?

VT Stormwater Manual Non LID • Not zoning –road width, density • Designers can

VT Stormwater Manual Non LID • Not zoning –road width, density • Designers can choose “centralized facilities”

VT Stormwater Manual Unclear • • Pervious Pavement and Concrete Green Roofs Rain Gardens

VT Stormwater Manual Unclear • • Pervious Pavement and Concrete Green Roofs Rain Gardens Rain Barrels / Cisterns

Future Revisions • Based on Maryland ESD • Manage site to reflect a runoff

Future Revisions • Based on Maryland ESD • Manage site to reflect a runoff coefficient of “woods in good condition” • Distributed practice accounting

Future Revisions • How determine if site has maximized GSI? • Raising the bar

Future Revisions • How determine if site has maximized GSI? • Raising the bar on nutrient removal – the best “incentive”? • Collecting the disconnected • Not development standards

No State Permit Required < 1 Acre Impervious Surface

No State Permit Required < 1 Acre Impervious Surface

Questions?

Questions?

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