Space Efficient BMP Design for Urban

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Space Efficient BMP Design for Urban
Stormwater Management
Geoff Mok
Stormwater Consultant
Vaikko P. Allen II, CPSWQ, LEED-AP
Director - Stormwater Regulatory Management
CONTECH Engineered Solutions
Phone: 310-850-1736
[email protected]
www.contech-cpi.com
CONTECH Engineered Solutions
Phone: 310-850-1736
[email protected]
www.contech-cpi.com
2014 Montana Stormwater Conference
April 9th, 2014
Billings, Montana
www.ContechES.com
Agenda
1. Regulatory Discussion
o BPSOU Project
2. Defining LID & Design Hierarchy
3. Run-off Reduction & WQ Treatment Methods
o
Reasons for Moving Underground
4. Underground Design Options
o In-depth Look at BPSOU Project
o In-depth Look at Walgreens – Butte & Eisinger Motors - Kalispell
5. Questions & Discussion
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Regulatory Drivers for Post Construction
Stormwater Management
 2010 Statewide Phase II permit requires local stormwater
ordinances to be adopted by 2012 requiring retention of the
0.5 inch, 24-hour design storm with LID BMPs where feasible
 Design storm targets may be larger locally
o Whitefish and Kalispell use 1.1 inch storm
 Hydrodynamic Separators are often used where retention isn’t
feasible and are usually sized to achieve 80% TSS removal
o Washington Dept. of Ecology Pretreatment Use Level Designation
widely used as a performance verification reference
 Filters are used where dissolved or fine particulate pollutants
are targeted
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LID IS AN APPROACH
GREEN INFRASTRUCTURE
ELIMINATES RUNOFF
TREAT STORMWATER
AS A RESOURCE
MAINTAIN HYDROLOGIC
FUNCTION
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CONTECH Design Hierarchy
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Detention / Infiltration Design
Pre-developed runoff
Developed Runoff
Pre-developed
runoff
Detention / Infiltration
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Infiltration BMPs – A Unit
Process Approach
 Detention or Ponding
 Treatment
o
Removal of pollutants through physical, chemical and biological
processes
 Infiltration
o
Dissipation of water into native soil
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Landscape Based Infiltration
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Pervious Pavement
Bioretention
Infiltration Basin
Infiltration Trench
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Permeable Hardscape
Benefits:
•
•
•
•
A “cornerstone” BMP for LID and Green Infrastructure
Infiltration reduces runoff and pollutant export
Reduction in surface ponding
No dedicated landscaping required
Challenges:
•
•
•
•
•
Cost
Installation QA/QC
Cold climate issues
Maintenance and Longevity
Spill control and pretreatment
www.ContechES.com
© 2012 Contech Engineered Solutions LLC
What is the Difference?
Bioretention
Infiltration
Biofiltration
Flow through Treatment
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© 2012 Contech Engineered Solutions LLC
What is the Difference?
Bioretention
Infiltration
Biofiltration
Flow through Treatment
www.ContechES.com
© 2012 Contech Engineered Solutions LLC
Current Bioretention Practice
 Horizontal bed filtration
◦
◦
◦
◦
Pollutants trapped on media surface
Limited head pressure
< 20:1 filter area to land space ratio
Submerged plants
 Open Design
◦ Aesthetics – pollutants/trash exposed
◦ Dedicated land area
 Inlet/Outlet design
◦ Low slope inlets, prone to clogging
◦ Overflow in media bed – prone to washout
 No Flow Control
◦ Oversizing as safety factor
www.ContechES.com
© 2012 Contech Engineered Solutions LLC
Challenges: Gross Pollutants
Challenge
• >5 mm - trash and debris
– Organic matter (Leaves, bud shatter,
landscaping materials)
– Trash
• >500 microns - coarse sediment
– Pavement abrasion, sand, organic
fragments
Impact
• Clogged inlets
• Premature bypass
• Slower infiltration rates
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© 2012 Contech Engineered Solutions LLC
Challenges: Horizontal Bed
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© 2012 Contech Engineered Solutions LLC
Challenges: Inlet Design
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© 2012 Contech Engineered Solutions LLC
Challenges: Outlet Design
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© 2012 Contech Engineered Solutions LLC
Challenges: Winter Weather
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© 2012 Contech Engineered Solutions LLC
UrbanGreen™ BioFilter
 Physical filtration and
biological treatment remove
TSS and nutrients
 Infiltrating design equals
bioretention performance in
small footprint
 Meets site aesthetics and
regulatory goals
www.ContechES.com
Urban Green BioFilter Operation
1.
Runoff Reduction:

Evapotranspiration of dry weather
runoff and small storms

Infiltrating vault design and
downstream infiltration chambers
mimic bioretention water balance
2.
Biofiltration:

> 90% removal of silt particles
(d50 < 25 um)
3.
Optional Media Filtration:

4.
StormFilter cartridges can be specified
to increase treatment flow rate
Bypass:

Peak events are bypassed upstream
of the treatment bays
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UrbanGreen BioFilter – Longview, WA
Analyte
SSC
TSS
Total Zinc
Soluble Zinc
Total Copper
Mean
In
mg/L
94
88
ug/L
118
43.8
10
Mean
Out
mg/L
15
13
ug/L
18
10.4
2.8
Removal
Efficiency
(%)
84.6
85.2
85.2
76.2
72.0
Median
In
mg/L
70.1
59
ug/L
81.7
34.5
6.4
Median Removal Summation
Out
Efficiency of Load
mg/L
(%)
(%)
8.5
87.9
85.6
8
86.4
85.2
ug/L
12.1
85.2
85.2
7.68
77.7
76.3
2.5
60.9
72
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Maverik Convenience Store
UrbanGreen BioFilter and ChamberMaxx Infiltration
Mead, WA
Design Challenges
• Meet stringent water
quality standards and runoff
reduction requirements
• Maximize usable land area
• Meet aesthetic goals for the
site with “green” solutions
Solution
• UrbanGreen BioFilter 6’x8’ met
water quality requirements
• ChamberMaxx infiltration
systems reduced runoff
• The tree selected matched site
landscaping design
Support
Outcome
• Product sizing and
• The entire system was
configuration design
installed in just two days
• Specifications
• The complete system
• Contract drawings
achieved Low Impact
• Installation guidance
Development goals
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Subsurface Infiltration
Maximize useable land
Minimize liability
Eliminate vector and wildlife control problems
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Subsurface Infiltration Systems
 Infiltration Trench
 Infiltration Gallery
 Drywell
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Infiltration trench
 Simple design that requires a lot of stone
 Inefficient use of space at 30-40% voids, adjacent
grass strip or swale and dedicated land area
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Infiltration Gallery
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Urban Trash Capture
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Pre-Treatment Options
Fine particles will clog the infiltrating surface over time
 Biofiltration - Removes particles ≥5 µm
 Media Filtration – Removes particles ≥10 µm
 Hydrodynamic Separation – Removes particles ≥ 50 µm
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METAL
Corrugated Metal Pipe
(CMP)
CONCRETE
CON/SPAN
PLASTIC
DuroMaxx
ChamberMaxx
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Detention Project #1
Eisinger Motors
In
Kalispell
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Eisinger Motors
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Eisinger Motors
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Eisinger Motors
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Eisinger Motors
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Detention Project #2
Walgreens Store
In
Butte
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Walgreens Project
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Walgreens Project
28”x20” Arched Pipe
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Walgreens Project
METAL
Corrugated Metal Pipe
(CMP)
CONCRETE
CON/SPAN
PLASTIC
DuroMaxx
ChamberMaxx
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Walgreens Project
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Walgreens Project
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Walgreens Project
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Detention / Infiltration Design Tools
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DYODS
HydroCAD Stormwater modeling software
Stage storage curve calculator
Land value based calculator
CMP durability documented performance
Team of engineers to assist you on your project
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UrbanGreen™ Rainwater Harvesting


Flexible runoff reduction
solution
Integrated turnkey
package systems
• Pretreatment
• Storage
• Pump, treatment and
control systems
Up to 10 LEED® points
for water harvesting!
www.ContechES.com
Systems: Pretreatment, Cisterns, Mechanical Treatment
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Large treatment capacity
Full capture
100% capture of harvested water
Non-clogging
Wall mounted or Underground
On-line and off-line options
Economical
Easy maintenance
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Systems: Pretreatment, Cisterns, Mechanical Treatment
 Permanent watertight storage
 Exceed project design life
 Calming inlet
 Below ground
 Designed for loading (H20)
 Access for maintenance
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Systems: Pretreatment, Cisterns, Mechanical Treatment
Location

Indoor or outdoor enclosure
Make-up water


Mechanical refill
Automatic switch to municipal
Pumps – variable speed


Constant pressure, save energy
Submersible is most common
Controls

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Basic protection – prevent pump damage
Standard treatment – automatic controls
Water management – remote monitoring and water info
Treatment
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On-online RWH Resources
RWH Video
 Runoff reduction SW permitting
 Water conservation
 Financial savings
 Conteches.com, YouTube
Rainwater Harvesting Runoff
Reduction Calculator™ tool
Enter basic site info to…
 Calculate runoff reduction
 Water conservation
 Financial savings
 Conteches.com
www.ContechES.com
Alta Vista Rainwater Harvesting
Redondo Beach, CA
Design Challenges
 Dry weather base flow
 High pollutant loading
 Large volume watertight storage
CDS Pretreatment
145,000 gallon
UrbanGreen
SRPE Cistern
StormFilter Pretreatment
Solution
 CDS and StormFilter pretreatment
 Two SRPE Cisterns, 145,000 gal
storage
 Capture and treat base flow
 Irrigate city park
Support
 Pretreatment design
 Custom layout to fit site restraints
 Hydraulic analysis
 On-site installation support
Outcome
 Reduction of beach closures
 Reduced potable water demand
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Stormwater Management StormFilter:
Designed for Flexibility and Longevity

Extensive lab and field testing and highest approval level with
NJDEP, WADOE and many other agencies

Cartridge height options of 12”, 18”, and 27” accommodate
various hydraulic drop conditions

Customized media options target TSS, Phosphorus, heavy
metals and hydrocarbons

Controlled flow rates through entire media column using siphon
actuated filtration extends media life

Cartridge hood separates media from floating grease and gross
pollutants, further increasing longevity
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Evolution of Filter Technology:
Horizontal to Radial
 Increased longevity
 Smaller structures
 Easier maintenance
 Custom filter media options
Horizontal Bed Filter
Manhole StormFilter
www.ContechES.com
StormFilter Media
PhosphoSorb
™
Sediments
■
Phosphorous
■
Oil and
Grease
■
Soluble
Metals
■
Perlite
CSF®
Leaf Media
ZPG
■
■
■
■
■
Organics
Nutrients
■
■
■
■
■
■
■
■
■
■
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StormFilter – Proven Technology
 140,000+ cartridges installed over the last 20 years
 Extensive lab and field testing to most stringent protocols
• Technology Assessment Protocol – WADOE (TAPE)
o Evaluated 33 storms in the field
o Achieved State of Washington Department of Ecology General Use
Level Designation for basic treatment
• Technology Acceptance and Reciprocity Partnership (TARP): Tier 1
(lab) and Tier II (field) protocol completed and verified
o Achieved State of New Jersey, Department of Environmental Protection
Final Certification: Standalone BMP
• Additional approval criteria and/or 3rd party lab and field testing
requirements met including MD, NC, VA, TN, NY, TX, MO, CA, NV,
OR, CO, OH, GA, ME and many others nationally and internationally
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Filtration Project
BPSOU - Phase II
Project In
Butte
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BPSOU – Phase II
Goal = Metals Removal
Reason for Underground
Design
– No Infiltration & Limited
Space
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BPSOU Phase II
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Jellyfish® Filter Introduction

High surface area membrane filtration

Field tested per TARP protocol and NJDEP
approved for 80% TSS removal at 80gpm per
54” cartridge

Typical driving head: 18 inches

Compact system decreases installed cost and
site footprint

Easy to inspect & maintain
◦ Fewer cartridges
◦ Lightweight cartridges
◦ Backwashed after each storm peak
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Jellyfish® Filter Components
Maintenance Access Wall
(MAW)
Hi-flo Cartridges &
Backwash pool
Draindown cartridge
Jellyfish Filter cartridges
Separator skirt
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Jellyfish® Filter Operation
3 functions in 1 system
Pretreatment
Filtration
Passive Backwash
Cartridge
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Hydrodynamic Separation

Targets suspended solids, oils and trash

Ideal for pretreatment and retrofit applications

Accepted as stand-alone treatment in some regulatory
jurisdictions

Manhole or vault configurations available to accommodate
varying site conditions

Internal or external high flow bypass allows inline or offline
designs

Lab and 3rd party field testing, approved by WADOE,
NJDEP and many others
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Hydrodynamic Separation

Captures and retains
100% of trash and debris

Shallow system
profile for easy
installation
VortSentry® HS

Internal bypass simplifies
installation
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Knowledge. Solutions.
Service.
Sedimentation Tank
HDS Fundamentals

Low velocity vortex action
•
•

Flow controls
•
•
•

Increases efficiency by increasing length of
flow path
Concentrates solids in low velocity flow field
Minimizes turbulence and velocity
Prevents flow surges and re-suspension
Retains floating pollutants
Maintenance
•
Pollutants are captured in an easily
accessed structure
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Key Features and Benefits:

Multiple options to meet site-specific needs
•
Inline, offline, grate inlet and drop inlet
configuration
•
Accepts multiple pipe inlets and 90-180 degree
angles – eliminate the need for junction
manholes
•
Internal and external peak bypass options
available
 Excellent pollutant retention
•
Isolated storage sump eliminates scour potential
•
Oil baffle improves hydrocarbon removal
 Proven performance
•
Performance verified by NJCAT, WA Ecology
and 3rd party verified lab and field tests
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Direct Screening
CDS Indirect Screening
4700-MICRON
Key Features and Benefits:

2400-MICRON
One-of-a-kind screening technology
• Captures and retains 100% of floatables and
neutrally buoyant debris 2.4mm or larger
• Effectively removes solids down to 100um
• Self-cleaning-screen – the only non-blocking
screening technology available
• Water velocities within swirls chamber
continually shear debris off the screen to
keep it clean
• Various screening apertures available
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HDS Project
BPSOU Project
In
Butte
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BPSOU
Soil Contamination = No Infiltration
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BPSOU
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BPSOU Project
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BPSOU Project
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Complete Performance Standards
Performance standards preferably include:
 Pollutants of interest
 Probabilistic performance level
o
Preferably addressing both removal efficiency and effluent concentration
 Conditions under which the performance standard must be met
o Water quality design storm (flow or volume based)
o Average annual load reduction
 Should include operation and maintenance feasibility criteria
Clear performance specifications safeguard against a downward spiral of
price based sizing
 Multiple opportunities for “value engineering” in project life cycle can
reduce SCM cost and effectiveness
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Design Your Own Hydrodynamic Separator
 Input design criteria to
select the appropriate HDS
unit(s) for your site
◦ Select appropriate unit based on
sight constraints
◦ Size unit based on multiple
mean particle size and targeted
removal percentage
◦ Localized rainfall data provided
◦ Pdf report includes performance
calculations, specification and
standard drawing for the unit that
was sized
Quickly prepare designs for estimates/project meetings
and be more efficient with billable time
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Leader in Engineered Solutions!
Supporting Every Stage of Your Project
Solution
Development
Design Assistance
Installation
 Customized Designs – Tailored to fit your unique site requirements
 Unique Value Proposition – Offering speed of construction and overall project savings
 Highly Trained Team of Professionals – Unrivaled technical support for your project
 Local Support – Coverage across U.S., Canada, Mexico, Central America, China & Australia
 Proven Track Record – Over 100 years of demonstrated company and product performance
Highway | Airport | Railway | Mining | Military | Energy
Agriculture | Industrial | Commercial | Municipal | Rehabilitation | Residential
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