wild for innovation: stormwater and stream restoration

STORMWATER AND STREAM RESTORATION

Tom BallesteroEnvironmental Research Group

5 March 2010

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UNH STORMWATER CENTER

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The new paradigm for stormwater management is Low Impact Development

Conventional strategies now represent the “dark side” of stormwater

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FIELD FACILITY AT THEUNH WEST EDGE LOT

POROUS ASPHALT

Main UNH SC

Research Facility

TREEFILTER

Watershed

Boundary

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POROUS ASPHALT

TREEFILTER

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TREATMENT STRATEGIES:LOW IMPACT DEVELOPMENT TECHNOLOGIES

Porous Asphalt

Gravel WetlandSand Filter

Bioretention Unit Tree Filter

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I-95 North, June 2005, OGFC overlay

I-95 North, June 2005, NO OGFC overlay

I-95 South, June 2005, NO OGFC overlay on right-hand side

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A.K.A. WHERE’D ALL THAT WATER GO?

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PA VS. OGFC

4”

4”

4’ SHWT

NATIVE

MATERIALS

2’ ROAD BASE

Impervious base

POROUS ASPHALT OGFC - wearing coarse

¾” CHOKER

2’ SANDY RESERVOIR

BASE

NATIVE

MATERIALS

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POROUS ASPHALT PARKING LOT SYSTEM CROSS-SECTION

4” thickness of ¾” crushed stone

4” of porous asphalt

8-12” thickness of open graded reservoir subbase

Soil permeability >0.5 in/hr

4” thickness of ¾”> crushed stone for frost protection

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STREAM RESTORATION

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Pre-Existing Site Looking Upstream

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5 Weeks After Construction Looking Upstream

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2 Years After Construction Looking Upstream