Field Performance Assessment of

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Presentation transcript:

Field Performance Assessment of Pretreatment Practices for Bioretention Andy Erickson, Research Associate St. Anthony Falls Lab, University of Minnesota Minnesota Stormwater Research Council June 27, 2018. Minneapolis, MN

Bioretention Practices Shallow Depressions Infiltrate Stormwater Runoff Aesthetic Amenity Maintenance?

Bioretention Maintenance Inspection, Inspection and Maintenance of pretreatment unit(s), Pruning, Mowing, Mulching, Watering (first 1-2 months), Vegetation Replacement, Weeding, Trash Removal, Clear Outlet Structures, Sediment Removal.

Study Objectives Synthetic runoff testing to measure removal of sediment and gross solids Rock-lined inlet Grass-lined inlet Rain Guardian Bunker Rain Guardian Turret (matching funds) Non-proprietary Sump/Trench (optional) Report results as mass-based percent removal

Study Site – Anoka, MN 600 ft2 Surface Area 10.5 ac drainage Area

Study Site Adaptations

Preparation for Testing Test Flow Rates = 0.25 cfs & 0.5 cfs

Preparation for Testing Sediment conc. = ~160 mg/L d50 = 1.17mm; d50 = 0.41mm; d50 = 0.12mm Gross Solids Conc. = ~40mg/L

Post-Test Quantification Rock-Lined Inlet Known feed & pre-rinsed rock (influent) Remove and rinse rock (captured) Remove and clean fabric (captured)

Rock Cleaning

Post-Test Quantification Grass-Lined Inlet Known feed & pre-rinsed grass (influent) Remove and clean fabric downstream of grass-lined inlet (effluent or bypass)

Gross Solids Feed

Tests to Date Rock-lined Inlet Grass-lined Inlet 0.25 cfs x 2 reps Procedure Clean site Install pretreatment Pre-rinse, clean Test Collect sediment & gross solids Prepare for next test, or restore site Rock-lined Inlet 0.25 cfs x 2 reps 0.5 cfs x 2 reps Grass-lined Inlet 0.25 cfs x 2 reps 0.5 cfs x 2 reps

Field Tests

Preliminary Results Rock-Lined Inlet

Preliminary Results Grass-Lined Inlet

Summary Approximately 50% of proposed field testing has been completed (analysis still required) Preliminary results suggest Rock-lined and Grass-lined inlets capture sediment and gross solids Next Steps: Complete testing, Consider optional testing, Analyze results, Write report Outreach (LID 2018, WRC, O&M of SCMs 2019, etc.)

Acknowledgements THANK YOU!! Collaborators: SAFL: Matt Hernick, Rob Gabrielson, Peter Olson Anoka Conservation District: Chris Lord, Jared Wagner, Green Corps Sponsors & Partners: Minnesota Stormwater Research Council (MSRC), Anoka Conservation District, City of Anoka THANK YOU!!

Thanks for your attention! Questions? Andy Erickson eric0706@umn.edu