making bioretention work
DESCRIPTION
Making Bioretention Work. Sustainability for all the places between the buildings. Green Girl Land Development Solutions. Certified Woman Owned Business Sole Proprietorship NOT Design & Permitting Technical Assistance & Project Based Mentoring. Agenda. - PowerPoint PPT PresentationTRANSCRIPT
Making Bioretention Work
Sustainability for all the places between the buildings.
Green Girl Land Development Solutions
• Certified Woman Owned Business
• Sole Proprietorship
• NOT Design & Permitting
• Technical Assistance & Project Based Mentoring
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
1. Suitable Infiltration Areasare NOT found on a NRCS soils map
You must test your soil where bioretention is going to be located
2. Flow-Through (Lined) Facilities are NOT nearly as good as infiltration facilties
43
Lined on three sides with an impermeable liner =
“Flow-Through”
Detention Basin & Flow Through Facilities Results
from a Watershed Perspective
3. Don’t Over-engineer It
31
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
4. Consider Contribution Area Don’t Underestimate Flows or WQ Impacts
4. Consider the Contribution AreaDon’t Underestimate Flows or WQ Impacts
• Most gravel roads and parking lots are impervious
4. Consider Contribution Area
• Copper• Zinc (Galvanized)• Iron (Rust=iron)(in roofs &
downspouts)• What else is coming
from YOUR site?
4. Consider Contribution Area
What pollutants are intentionally designed
into your facility?
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
6. Settle out Sediments Before Bioretaining
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)
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
7. Help Water Make 90 degree turns
8. Protect Against Erosionwith overland flow
8. Protect Against ErosionRounded Rock Doesn’t Adequately Slow Water
• Use crushed, angular rock instead
8. Protect Against ErosionDon’t plant vegetation in rows parallel to flows
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.
9. Design to pond water for better WQ
10. Choose Vegetation CarefullyUse a diversity of species… or not
10. Choose Vegetation CarefullyUse Native Vegetation (not “harmless” non-
natives)
10. Choose Vegetation CarefullyUse Native Vegetation (not “harmless” non-
natives)
11. One last best practiceHave fun!
Thank You for Coming Today!
Sustainability for all the places between the buildings.
PollutionPollution
Bioretention is NOT a Silver Bullet
And can make things worse.There’s no substitute for SOURCE CONTROL
PollutionPollution
Some Common Pollutants
Sediment (air particulates)Nutrients
FecesOther debris
Runoff volumes
Sediment/turbidityHydrocarbons
Heavy metals (particles & soluble)Other chemicalsRunoff volume
Sediment/turbidityfertilizerspesticidesherbicides
Runoff volume
Bioretention& Development
Sediment (
air part
icula
tes)
Feces
Other d
ebris
Runoff volu
me
Sed
imen
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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