making bioretention work sustainability for all the places between the buildings
TRANSCRIPT
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Making Bioretention Work
Sustainability for all the places between the buildings.
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Green Girl Land Development Solutions
• Certified Woman Owned Business
• Sole Proprietorship
• NOT Design & Permitting
• Technical Assistance & Project Based Mentoring
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Agenda
• OVERALL MESSAGE: How to create more effective facilities (ones that protect your watershed) that are less costly and lower maintenance!
• Top 10 Common Mistakes to Avoid: Considerations for planning, design, construction & maintenance of common bioretention components
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1. Suitable Infiltration Areasare NOT found on a NRCS soils map
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You must test your soil where bioretention is going to be located
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2. Flow-Through (Lined) Facilities are NOT nearly as good as infiltration facilties
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Lined on three sides with an impermeable liner =
“Flow-Through”
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Detention Basin & Flow Through Facilities Results
from a Watershed Perspective
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3. Don’t Over-engineer It
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OSU Extension - Sea Grant OregonChoose the Right Rain Garden Wizard
Find out where you should and shouldn’t infiltrate!http://extension.oregonstate.edu/stormwater/
choose-right-rain-garden
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4. Consider Contribution Area Don’t Underestimate Flows or WQ Impacts
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4. Consider the Contribution AreaDon’t Underestimate Flows or WQ Impacts
• Most gravel roads and parking lots are impervious
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4. Consider Contribution Area
• Copper• Zinc (Galvanized)• Iron (Rust=iron)(in roofs &
downspouts)• What else is coming
from YOUR site?
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4. Consider Contribution Area
What pollutants are intentionally designed
into your facility?
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5. Undercutting can be protected against
• A curb or impermeable liner (vertically installed) would have prevented damage to the adjacent impervious pavement at this inlet
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6. Settle out Sediments Before Bioretaining
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And make it easy on the maintenance folks
• Rip rap makes it difficult to remove sediment from and re-suspension is more likely than in sumped structures (shown previously)
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7. Help Water Make 90 degree turns
Depressed gutter
Depressed gutter
Make curb cut at least a shovel wide or wider
Make curb cut at least a shovel wide or wider
Round the corners
Round the corners
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7. Help Water Make 90 degree turns
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8. Protect Against Erosionwith overland flow
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8. Protect Against ErosionRounded Rock Doesn’t Adequately Slow Water
• Use crushed, angular rock instead
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8. Protect Against ErosionDon’t plant vegetation in rows parallel to flows
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8. Protect Against Erosionbut don’t use the dry creek bed look
• To maximize water quality treatment, plants must be in the bottom, where the most polluted “water quality” storm flows the most often.
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9. Design to pond water for better WQ
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10. Choose Vegetation CarefullyUse a diversity of species… or not
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10. Choose Vegetation CarefullyUse Native Vegetation (not “harmless” non-
natives)
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10. Choose Vegetation CarefullyUse Native Vegetation (not “harmless” non-
natives)
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11. One last best practiceHave fun!
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Thank You for Coming Today!
Sustainability for all the places between the buildings.
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PollutionPollution
Bioretention is NOT a Silver Bullet
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And can make things worse.There’s no substitute for SOURCE CONTROL
PollutionPollution
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Some Common Pollutants
Sediment (air particulates)Nutrients
FecesOther debris
Runoff volumes
Sediment/turbidityHydrocarbons
Heavy metals (particles & soluble)Other chemicalsRunoff volume
Sediment/turbidityfertilizerspesticidesherbicides
Runoff volume
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Bioretention& Development
Sediment (
air part
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Feces
Other d
ebris
Runoff volu
me
Sed
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t/tu
rbid
ity
Hyd
rocarb
on
sH
eavy m
eta
ls (
part
icle
s &
solu
ble
)O
ther
ch
em
icals
Ru
noff
volu
me
Sediment/turbidity
fertilizers
pesticides
herbicides
Runoff volume
?
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