Bioretention. Matt Scharver Northeast Ohio Regional Sewer District. #ProjectCleanLake
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1 Bioretention Matt Scharver Northeast Ohio Regional Sewer District
2 Stormwater Management Training for MS4 Municipal Employees Training Session Agenda Pre-Training Survey Presentation & Site Visit Post-Training Survey Today s Selected SCM: Bioretention Design features Construction pitfalls Operation & Maintenance activities
3 Stormwater Control Measure Bioretention/Bioswale Bioretention
4 Bioretention Concept Overflow to local sewer or environment
5
6
7 Design Key Design Considerations/Features Hydrology Inlets and Outlets Materials Vegetation
8 Bioretention / Rain Gardens Uses soil media, mulch, and vegetation to reduce runoff and treat stormwater Treatment occurs through: Sediment settling Microbial breakdown Nutrient uptake by plants Infiltration Detention
9 Design Basics Designed to treat the Water Quality Volume Water Quality Volume = runoff from the first ¾ inch of rainfall Drain down in a day s time May be constructed online or offline
10 Bioretenion/Rain Garden Inlets Distributes runoff into bioretention via: Curb cuts Trench Drain Grass swales or berms
11 Pre-Treatment Reduce sediment loads Hydrodynamic separators Grass inlets Forebays
12 Treatment System Clean Out Mulch Bio-soil Sand Pea-gravel #57 Gravel Underdrain Underdrain
13 Bioretention Ponding Depths Should be 12 inches between the top of the bed and the top of the overflow
14 Bioretention Concept Overflow to local sewer or environment
15 Mulch Double shredded hardwood 3 layer Keeps weeds down
16 Soil Media Loamy Sand 2-4 feet By Volume 75% Sand (AASHTO M-6 OR ASTM C-33) 15% fines (Native soil) 10% Organic Matter (Compost) ph Phosphorus mg/kg
17 Bioretention Filter Layer Prevents the planting soil from moving into the stone 3 inches of sand over 3 inches of pea gravel #78 NO FILTER FABRIC
18 Bioretention Gravel Layer/Underdrains May or may not be designed with underdrains inch gravel bed of #57 washed stone Should be 3 inches of gravel above and below underdrain tile
19 Vegetation Tolerate temporary inundation Natives or cultivars depending on look and function Can include trees and shrubs Best to plant in deliberate patterns and plants of the same type together to better identify weeds from intended plantings
20 Construction Pre-Construction Meeting Timing Excavation Structural Components Planting Mulching
21 Construction - Timing Constructed AFTER the upstream drainage area is stabilized Avoid sealing off the native soils Avoid fines contamination of the bio-soil mix
22 Construction - Timing Ideally construct during dry weather Do not leave open for extended periods of time
23 Construction - Excavation Properly sized equipment Work from the sides Avoid bottom compaction Excavate in steps
24 Construction - Excavation Sides of cell vertical Bottom of cells level Use bucket teeth to scarify sides and bottom of cell
25 Construction - Excavation Erosion and Sediment control critical Keep practice off-line for as long as possible Stabilize side-slopes ASAP Protect bio-soils with sheeting or geotextile
26 Structural Components Inlet/outlet elevations critical to function Water needs to get into the practice Water needs to pond in the practice Outlets will be elevated Underdrain may be elevated to encourage infiltration Cleanouts should be provided
27 What s wrong in the photo?
28 Maintenance Key points Reading the practice Interpreting flow paths Listing of major maintenance components
29 Maintenance Key points Shredded vs. pine bark mulch Routine vs. non-routine maintenance Vegetation maintenance
30 Maintenance Key points Standing water, vegetation health, sediment & erosion Note sediment accumulations Note smaller orifice & outfall sizes Note shape of bioswale problem? Note underdrain & inlet configuration
31 Maintenance Final tips Refer to individual SCM project O&M Manual Obtain copies of As-Built Plans Maintain accurate map of feature s designed & constructed drainage area
32 Field Site: place site image here
33 Questions?
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