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
