Presentation on theme: "Making Bioretention Work Sustainability for all the places between the buildings."— Presentation transcript:
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 Areas are 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 Oregon Choose the Right Rain Garden Wizard Find out where you should and shouldn’t infiltrate! right-rain-garden
4. Consider Contribution Area Don’t Underestimate Flows or WQ Impacts
4. Consider the Contribution Area Don’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 Make curb cut at least a shovel wide or wider Round the corners
7. Help Water Make 90 degree turns
8. Protect Against Erosion with overland flow
8. Protect Against Erosion Rounded Rock Doesn’t Adequately Slow Water Use crushed, angular rock instead
8. Protect Against Erosion Don’t plant vegetation in rows parallel to flows
8. Protect Against Erosion but 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 Carefully Use a diversity of species… or not