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Durham innovative bioretention system, Durham, NH.

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Capstone Development

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Horne Street School, Dover NH

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LID in 2006

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LID in Now

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Show me the data!

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BMP Performance Monitoring

Research Field Facility at UNH Tc ~ 19 minutes

Watershed Boundary

Tree Filter

Porous Asphalt

Bioretention Retrofit

UNHSC Research Facility

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Parallel Performance

Evaluation

•Each system uniformly sized to treat 1” runoff for 1 acre of impervious area

•WQV=3300 cf

•Qwqv=1 cfs

•Uniform contaminant loading

•Uniform storm event characteristics

•Systems lined for mass balance

•Long term record of hydrology and contaminants

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Hydrodynamic Separator Subsurface Infiltration

Filter Unit

Porous Asphalt Retention Pond Stone Swale

Gravel Wetland Sand Filter Bioretention Unit Tree Filter

Pervious Concrete

Isolator Row

Veg Swale

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TSS Removal Efficiencies

100

90

80

70

60

50

40

30

20

10

0

TSS

% R

em

ova

l Eff

icie

ncy

DIN Removal Efficiencies

100

90

80

70

60

50

40

30

20

10

0

DIN

% R

em

ova

l Eff

icie

ncy

TP Removal Efficiencies

100

90

80

70

60

50

40

30

20

10

0

TP

% R

em

ova

l Eff

icie

ncy

Online vs. Offline

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HDS Online vs. Offline Performance

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Rem

ova

l Eff

icie

ncy

Hydrologic Performance Results

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Ru

no

ff R

ate

Time

Post-Development

Post-Development Peak Control

Pre-Development

Pre and Post Development Hydrographs

Courtesy Jeff Dennis, ME DEP, and CEI

Same storm < peak, = volume and > duration Same storm < peak and < volume

Storm with large peak and large volume

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Swale Flow and Volume Attenuation

Average Annual Peak Flow Reduction is 48%

Average Annual Lag Time is 19 min

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Porous Asphalt Flow and Volume Attenuation

Average Annual Peak Flow Reduction is 68%

Average Annual Lag Time is 790 min

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Lag Time (kL) Peak Reduction (kP)

5 2 1 0.5 0.1

Hydraulic Performance

What Have We Learned?

Rea

ctiv

e

Proactive

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Not All BMPs Are Created Equal

– Physical Operations

– Biological Processes

– Chemical Processes

– Hydrologic Operations

Use Unit Operations & Processes (UOPs)

It is not only about water quality! $$$$$$$$$$$$$$$$$$$

Economic impacts of land use change (increased runoff)

1.) Loss of revenue due to impacts to tourism and natural resources

2) Expenses from stress to municipal infrastructure

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Capital savings ranged from 15-80%

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Not Just a Pipe Dream

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Greenland Meadows Commercial Development, NH