Overview of Green Infrastructure
Techniques
University of New Hampshire Stormwater Center
Bioreten
Ɵ
on System Designs & Data
Water Quality Performance Data Hydraulic Performance Data
© 20ϭϱ. University of New Hampshire Stormwater Center. All Rights Reserved. 6” Perforated standpipe
with 1” orifice plate 12” Perforated riserw/solid cap (CPv overflow)
Geotextile on walls of excavation
12” 3/4” Crushed stone 4” 3/8” Pea gravel
6” Perforated subdrain 30” Bioretention soil mix
12” Qv bypass 12” Pipe
Not drawn to scale, vertical exaggeration
Riprap pad Impervious surface
Cross section of 72” diameter concrete vault 12” Overflow pipe Vegetation centered in treatment
Native soils
Qv conveyance protection bypass
Mound 6” berm around tree filter rim
100 Tree Filter
Bioreten
Ɵ
on Report Card
© 201ϱ. University of New Hampshire Stormwater Center. All Rights Reserved. target
uop “grade”
category
volume reducƟon
sedimentaƟon
enhanced
sedimentaƟon
filtraƟon
nitrogen phosphorus
Tree Filter Report Card
target
uop “grade”
category
volume reducƟon
sedimentaƟon
enhanced
sedimentaƟon
filtraƟon
Hydrodynamic Separators Design & Data
Water Quality Performance Data Hydraulic Performance Data
100 90 80 70 60 50 40 30 20 10 0
The effect of T and [Cl-] is to nearly double the settling time from 1.6 to 3.4 cm/sec
© 201ϱ. University of New Hampshire Stormwater Center. All Rights Reserved.
Hydrodynamic Separator Report Card
target
uop “grade”
category
hydrologic
physical
chemical biological
flow alteraƟon
volume reducƟon
sedimentaƟon
enhanced
sedimentaƟon
filtraƟon
microbial
vegetaƟve
sorpƟon
divert flow
sediment
sediment
sediment
nitrogen
nitrogen phosphorus
phosphorus
✓
—
Reten
Ɵ
on Pond Design & Data
100 90 80 70 60 50 40 30 20 10 0
Water Quality Performance Data Hydraulic Performance Data
© 201ϱ. University of New Hampshire Stormwater Center. All Rights Reserved.
© 201ϱ. University of New Hampshire Stormwater Center. All Rights Reserved.
Reten
Ɵ
on Pond Report Card
target
uop “grade”
category
hydrologic
physical
chemical biological
flow alteraƟon
volume reducƟon
sedimentaƟon
enhanced
sedimentaƟon
filtraƟon
microbial
vegetaƟve
sorpƟon
divert flow
sediment
sediment
sediment
nitrogen
nitrogen phosphorus
phosphorus
✓
✓
Porous Pavement Design & Data
Water Quality Performance Data
Hydraulic Performance Data
Sand/gravel (filter course)
6” Perforated subdrain Native soils
18”
4” Please subbase and dra soils.
4” 4” Porous concrete
3/4” Stone choker course
3/8” Stone infiltration resevoir
100
© 201ϱ. University of New Hampshire Stormwater Center. All Rights Reserved.
Porous Pavement Report Card
target
uop “grade”
category
volume reducƟon
sedimentaƟon
enhanced
sedimentaƟon
filtraƟon
Stormtech Isolator Row Design & Data
Water Quality Performance Data Hydraulic Performance Data
© 201ϱ. University of New Hampshire Stormwater Center. All Rights Reserved.
100
Inspection port location per engineer’s drawing Non-woven geotextile
Woven geotextile
Crushed stone
Cover entire row with non-woven geotextile
HDPE open-bottom
vaulted chambers 6” Perforated subdrain 24”
minimum sump
Catch basin or manhole 12” Qv bypass
Stormtech Report Card
© 2010. University of New Hampshire Stormwater Center. All Rights Reserved. target
uop “grade”
category
volume reducƟon
sedimentaƟon
enhanced
sedimentaƟon
filtraƟon
Swales Design & Data
Water Quality Performance Data Hydraulic Performance Data
2 ft.
Filter core stone and woodchip blend 50:50 Outer stone casing 6 to 8” stone
Vegetated swale with berm Berm cross-secƟon
100 90 80 70 60 50 40 30 20 10 0
Stone Swale Veg Swale Berm Swale
Swale Report Card (Berm)
© 201ϱ. University of New Hampshire Stormwater Center. All Rights Reserved. target
uop “grade”
category
hydrologic
physical
chemical biological
flow alteraƟon
volume reducƟon
sedimentaƟon
enhanced
sedimentaƟon
filtraƟon
microbial
vegetaƟve
sorpƟon
divert flow
sediment
sediment
sediment
nitrogen
nitrogen phosphorus
phosphorus
✓
✓
✓
—
Gravel Wetland Design & Data
Water Quality Performance Data Hydraulic Performance Data
© 201ϱ. University of New Hampshire Stormwater Center. All Rights Reserved.
12” Qvbypass
6” Subdrain 24” of 3/4”
Crushed stone
Not drawn to scale, vertical exaggeration
8” Wetland soil
Native soils
12” Pipe inlet from sedimentation forebay
6” Perforated riser pipe CPv overflow
© 201ϱ. University of New Hampshire Stormwater Center. All Rights Reserved.
Gravel Wetland Report Card
target
uop “grade”
category
volume reducƟon
sedimentaƟon
enhanced
sedimentaƟon
filtraƟon
