Virginia Street Tree Box Filters Demonstration Project
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1 Virginia Street Tree Box Filters Demonstration Project HARVESTING WATER IN THE LANDSCAPE: IMPLEMENTING LOW IMPACT DEVELOPMENT November 16, 2007 Chris Conway, CPSWQ, Kennedy/Jenks Consultants E. Terri Svetich, P.E., City of Reno
2 LID = Rainwater Harvesting Source: Brad Lancaster Kennedy/Jenks Consultants
3 Conventional vs. LID Landscaping Runoff Conventional Mounded Landscaping Creates Runoff Native Soil Standard Curb Pavement Native Soil Runoff (Plan Views) (Profile Views) LID - Bioretention Concave Landscaping Infiltrates Runoff Runoff Engineered Soil Standard Curb w/ Cut Pavement Native Soil Runoff
4 Bioretention Systems Kennedy/Jenks Consultants
5 Street Tree / Shrub Filters Kennedy/Jenks Consultants
6
7 Pollutant Removal - Plant Microbe Phytoremediation Translocate Accumulate Metabolize Volatilize Detoxify Degrade Exudates Bioremediation Soils Capture / Immobilize Pollutants Source: Larry Coffman
8 Pollutant Removal Mechanisms Physical Physical / Chemical / Biological Processes Sedimentation Filtration Adsorption Absorption Cation Exchange Capacity Polar / Non-polar Sorption Microbial Action (aerobic / anaerobic) decomposition / nitrification / denitrification Plant Uptake Cycling Nutrients / Carbon / Metals Biomass Retention (Microbes / Plant) Evaporation / Volatilization System Components Mulch Course Sand Pore Space Surface Area Complex Organics Microbes Biofilm Plants Ecological Structure Source: Larry Coffman
9 Virginia Street Storm Water Quality Improvements July 2006 Truckee River Fund grant awarded to the City of Reno $66, August 2006 Kennedy/Jenks retained by City to: Design Tree Box Filters Observe Construction Assist with Monitoring and Maintenance Evaluation Assist with Public Education and Outreach VPOINT Engineers General Civil Engineering TW Construction General Contractor Sept Dec 2006 Construction Period
10 Virginia St. Tree Box Filters Landscape filtration Systems Source: Portland SW Manual 2005 Kennedy/Jenks Consultants
11 Bioretention Systems Pollutant Removal Effectiveness TSS - 95% Heavy Metals - 99% Oil and Grease - 95% Total Phosphorous - 80% Total Nitrogen - 40% Coliform - 80% Treat over 90% of total volume in less than 1% of the urban landscape. Truckee River Pollutants of Concern: Temperature, Total N, Total P & TDS
12 Tree Box Filter Design Details
13 Tree Box Filter Design Details
14 Tree Box Filter Design Details
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16 TBF-4 Virginia St. Tree Box Filter (TBF) locations TBF-3 TBF-1&2
17 TBF-1 & 2 Infiltration Testing
18
19 TBF-1 1 & 2 Installation
20 TBF-1 1 & 2 Installation
21 TBF-1 1 & 2 Installation
22 TBF-1 1 & 2 Installation
23 Virginia Street Storm Water Quality Improvements TBF-3 & 4 Installation - Underdrain System
24 TBF-3 Installation - Underdrain System
25 Misc. Construction Observations Protect Outlet Drain Hole
26 Misc. Construction Observations Protect Curb Inlet Opening
27
28
29 Modified Curb Inlet Design
30 Infiltration only TBFs not draining 5/20/07 Soil mix and trees removed
31 Inappropriate drain rock mixed used Ensure use of Clean Drain Rock with no fines! Use uniformly graded aggregate not road base!
32 4 drainage holes and screen added
33
34 Virginia Street Storm Water Quality Improvements Observations & Lessons Learned Estimated Cost per TBF: ~$15,000 (infiltration only)* ~$23,000 (with underdrain system)* * Does not include irrigation system
35 Virginia Street Storm Water Quality Improvements Observations & Lessons Learned Conduct infiltration testing during the design phase not during construction Ensure standard septic system percolation testing methods are applied Retrofit projects may need to obtain soil infiltration data from soil borings
36 Virginia Street Storm Water Quality Improvements Observations & Lessons Learned Underdrain system with additional cleanout and 2 pipe sizes added to project costs Simplify underdrain system design for future projects Consider development of an approved engineered soil mixture Consider pre-manufactured systems
37 High Flow Media 10 to 50 inches / hour Peat Sand / Aggregate Matrix - PSD Peat 5 to 10% by volume Clay <2% (<0.002 mm) Silt <2% ( mm) Very Fine Sand 5% ( mm) Fine Sand 10% ( mm) Medium to Coarse Sand 70% ( mm) Coarse Sand 10-15% ( mm) Fine Gravel 5-10% ( mm) Source: Larry Coffman
38
39 Filterra Tree Filter Boxes
40 This is Low Income Development Not LID
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