Green Infrastructure and Stormwater PreTreatment Concept Silva Cell Crate System Freno Modular FlowThrough Planters MicroPool Stormwater Swale Streetscape Planting Concepts ID: 694216
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Slide1Slide2
The
Green Corridor Project
Green Infrastructure and
Stormwater
Pre-Treatment Concept
“Silva Cell” Crate System
“
Freno
” Modular Flow-Through Planters
Micro-Pool
Stormwater
Swale
Streetscape Planting ConceptsSlide3Slide4
Design Considerations: Expected Pollutants
Landscaping sites
(fertilizers -- phosphorus and nitrogen): greater cell depth will help filter these.
Studies show that removal of these pollutants increases with the depth of the bio-retention cell, reaching removal levels up to 80% for phosphorus and 60% for nitrogen (TKN) with sufficient depth (study results relating to nitrogen vary).
Parking lot or streetscape applications
(metals, oils, grease and solids): Thicker mulch layer
Studies support that a significant mulch layer will effectively remove greater than 90% of copper, zinc and lead.
In urban areas where heavy metals are the focal pollutants, shallow bioretention facilities with a significant mulch layer may be recommended. In residential areas, however, where the primary pollutants of concern are nitrogen and phosphorus, the depth dependence will require deeper cells that reach approximately 2 to 3 feet
http://www.lid-stormwater.net/bio_benefits.htmSlide5
Bio-retention removes Pollutants (survey of studies)
Pollutant
Pollutant Removal
Copper
43%-97%
Lead
70%-95%
Zinc
64%-95%
Phosphorus
65%-87%Total Kjeldahl Nitrogen (TKN)52-67%Ammonium (NH4+ )92%Nitrate (NO3-)15%-16%Total nitrogen (TN)49%Calcium27%
Bioretention BMP, http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index. Slide6
Fairfax Boulevard
Stormwater
Pre-Treatment Filtration Based System
Filtration Systems provide temporary storage and filtration of
stormwater
, contributing to:
Water quality control
Percentage Reduction of Stormwater VolumeChannel protection,Overbank protection, andExtreme flood controlUsed where soils are not suitable for infiltration
The system stores and treats
stormwater
before returning it to the stormwater drainage system typically through a perforated under-drain.Use of small scale, natural drainage features to slow, clean and capture runoff to reduce the impacts of development on rivers, streams, lakes, coastal waters, and ground water.Slide7
Fairfax Boulevard
Lancaster Cir. To 6
th
Ave
“Silva Cell” Crate System
Suspended Concrete and Brick Paving
Stormwater
Distribution/Irrigation Lines
“Silva Cell” Structural Crates Containing
Uncompacted
Engineered Soils for Tree Root Growth and Water RetentionPerforated Under Drains for Large Storm EventsGeomembrane Liner to prevent Infiltration beyond the Structural Crate SystemConnection to the Underground Storm Sewer SystemSlide8
How the “Silva Cell” Crates worksSlide9Slide10
Washington DC- SW 1
st
street- Silva Cells 2008- 2010Slide11
Willow Oak (
Quercus
phellos
) Planted 1985, 25 years old in 2010
Avg
DBH 16 inches;
Avg 44 feet; Avg Soil Volume 700 cubic feet
City of Charlotte Soil Vaults- 1985Slide12
Fairfax Boulevard
6
th
Ave. to 12
th
Ave.
Modular Flow-Through Planters
Precast Concrete Curb Drain/Inlet
Gravel Filter Strip
Overflow Drain for Large Storm Events
Geomembrane Liner to prevent Infiltration beyond the Flow-Through PlanterModular Precast Concrete Flow-ThroughPlanter WallsConnection to the Underground Storm Sewer SystemHerbaceous Plantings2 inch Mulch LayerEngineered SoilsSand and Gravel Drainage BedPerforated Under DrainsSlide13
“
Freno
” Modular Flow-Through PlantersSlide14Slide15
Life Cycle Benefits
As a modular system the
Freno
Flow-Through Planter can be removed and reused.
Similarly, components can be removed and reconfigured if the site is redesigned.
The system can be repaired with replacement parts if accidental damage occurs.Slide16
Suggested Modular Flow-Through Planter Maintenance
Activity
Schedule
Water plants daily for 2 weeks
At project completion
Inspect soil and repair eroded areas
Remove litter and debris
Re-mulch void areas
As Needed
Remove and replace dead and diseased vegetation
Twice per year Add mulch Cut back herbaceous plantings during winter dormancy Once per year Test soil treatment performance and replace soil/plants Testing 3 yearsAs needed (7-10years)Bioretention BMP, http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm Slide17
Fairfax Boulevard
6
th
Ave. to Fairfax Crossing
Micro-Pool
Stormwater
Swale
Landscape Micro-Pool Plantings w/ Street Trees
Weir Wall Spillways
Overflow Drain for Large Storm Events
Connection to the Underground Storm Sewer System3 ft. Turf Filter StripHerbaceous Plantings with Formal Planting BorderPerforated Under DrainsSlide18
Layered and “Over” Planting Approach to Micro-Pool PlantingSlide19
Suggested Micro-Pool Weir Planting Maintenance
Activity
Schedule
Water plants daily for 2 weeks
At project completion
Inspect soil and repair eroded areas
Remove litter and debris
Re-mulch void areas
As Needed
Mow monthly for the First year
First year Only Add mulch Mow and/or cut back plantings during winter dormancySelectively Remove Invasive exotic Plants Once per year Re-plant eroded and bare areas after large storm events As neededBioretention BMP, http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm Slide20
The Key to the Overall Success of the Micro-Pool Planting is to not over maintain after the First Year
Mow and/or cutback once a year
No irrigation needed
No fertilizing neededSlide21
Bio-diverse Planting of Street TreesSlide22
Layered and “Over” Planting Modular Flow-Through PlantersSlide23
Micro-Pool Strategic Combination Plantings Slide24
Brick and Concrete Paving between Lancaster Cir. And 6
th
Ave. Slide25Slide26Slide27Slide28Slide29Slide30Slide31Slide32Slide33