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This is a presentation designed to show examples of practices that are being suggested for the ORCCA land development project in Coos Bay, OR
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ORCCA Mini-charrette meetingJul 16, 2010
Courtesy of Scott Edwards Architecture
The Water Balance Model: typical for CascadiaWater Quantity Before
16.5” interflow(infiltration)
26” e
vap
o-
tran
sp
irati
on
0.2” runoff
65” r
ain
fall
yearl
y a
vg
22” g
rou
nd
wate
r(i
nfi
ltra
tion
)
The Water Balance ModelWater Quantity After
0” baseflow(infiltration)
red
uced
evap
o-
tran
sp
irati
on
63” runoff65” r
ain
fall
yearl
y a
vg
2” e
vap
o-
tran
sp
irati
on
Red
uced
infi
ltra
tion
Impervious SurfacesA Watershed Perspective
The Water Balance ModelWater Quality Before
Some sediment
The Water Balance ModelWater Quality After
Sediment (air particulates), dissolved
pollutants (nitrogen, zinc), heavy metals, Feces, Temperature,
other debris
Sediment/turbidity,
Hydrocarbons, Heavy metals, temp, feces,
other chemicalsSediment/turbidity
fertilizers, pesticidesherbicides,
feces, heavy metals
Air
Soil
Image from Soil Quality Information Sheet, U.S. Department of Agriculture
Best Management Practices (aka BMPs)Two Types
N
ORCCA’s Priority List – reorganizedFILTRATION
• Bioretention/rain gardens
• Vegetated swales• Vegetated filter
strips• Wetland
preservation
Structural BMPsInfiltration and Water Quality
Water quality benefits of infiltration techniques from the “National Pollutant Removal Performance Database for Stormwater Treatment Practices” Center for Watershed Protection, June 2000
PollutantInfiltrati
on
SW Wet-land
Wet Pond Filtering
WQ Swale
Dry Pond
Total Phosphorus
70 49 51 59 34 19
Soluble Phosphorus
85 35 66 3 38 -6
Total Nitrogen 51 30 33 38 84 25
Nitrate 82 67 43 -14 31 4
Copper N/A 40 57 49 51 26
Zinc 99 44 66 88 71 26
Total Suspended Solids
95 76 80 86 81 47
ORCCA’s Priority List – reorganizedRUNOFF REDUCTION
Infiltration• Trenches• Rain gardens &
other vegetated treatment systems
• Porous pavement• Disconnected
downspoutsEvaporation• Eco-roof
Reuse• Cisterns for parking
lot, street, sidewalk, and roof storage
Additional suggestions:
• Limit disturbance• Save trees
Infiltration trenches are a UICnot recommended for our timeline
Rain Gardens
Other vegetated systems: Planters
Other vegetated systems: Vegetated Filter Strips
Pervious pavements: Use with CAUTION here
POROUS ASPHALT IN 1- 2” LIFT
UNCOMPACTED SUBGRADE
NON-WOVEN PROPYLENE GEOTEXTILE
12”
1-1/2” to 1” WASHED CRUSHED AGGREGATE
3”
Downspout Disconnection
Eco-roofs
Cisterns for parking lot, street, sidewalk, and roof storage
ORCCA’s Priority List – additional BMPsRUNOFF REDUCTION
• Trellises and other vertical vegetation
• Limit disturbance• In Planning• Save a tree in design• In construction
• Minimize impervious surfaces
Trellises & other vertical vegetation
Trellises & other vertical vegetation
Limit Disturbance in Planning
Limit Disturbance in DesignSave a Tree
Limit DisturbanceConstruction Practices
Limit DisturbanceConstruction Practices: Don’t cement treat the
soil
Minimize impervious surfaces
ORCCA’s Priority List – reorganizedSTORAGE (aka Peak Flow Attenuation)
Caution: Storage for peak flow attenuation is not necessarily LID but will help us argue against the detention pipe.
• Depressional storage in landscape islands and in tree, shrub, or turf depressions = runoff reduction through infiltration and treatment
• Storage in wetland• Compost amendment and other soil
restoration practices
Storage in wetland at Oleson Woods Apts
ORCCA’s Priority List: additional BMPsSTORAGE (aka Peak Flow Attenuation)
• Compost amendment and other soil restoration practices
Compost Amendment & other soil restoration practices
Photos on left are from Soils for Salmon website
ORCCA’s Priority List – reorganizedCONVEYANCE
• Eliminate curbs & gutters
• Swales• Roughening
surfaces• Long overland flow
paths over landscaped areas
• Installing smaller culverts, pipes, & inlets
• Creating terraces and check dams
Eliminate curb & gutter
Eliminate curb & gutter
Swales & daylighting
Swale & DaylightingDetails
Swale & DaylightingDetails
Check dams
ORCCA’s Priority List: additional BMPsCONVEYANCE
• Don’t impede subsurface flows.
• Use treatment trains to extend the life of the vegetated facilities.
Transportation BMPsTraffic calming woonerf
Photo from Techniques for Urban Sustainability website
Additional BMPs: Source Control
Additional BMPsSource Control in Construction
Additional BMPsSource Control in Construction
Photo excerpted from “BMPs for Stormwater Discharges Associated with Construction Activities”, DEQ, Feb 2006
Additional BMPsSource Control in Construction
Photos and study and text excerpted from “BMPs for Stormwater Discharges Associated with Construction Activities”, DEQ, Feb 2006
Additional BMPsSource Control Post Construction
Biodiversity
Siting Consideration
N
Additional BMPs discussed but no photos
• More landscape practices• Water use• Source control• Materials• Operations &
Maintenance• Social Goals• Passive Solar Design• Construction Management
ORCCA Mini-charrette meetingJul 16, 2010
Sustainability for all the places between the buildings.