stormwater management technical seminar - armtec

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© 2013 Armtec Infrastructure Inc. • Confidential & Proprietary

Webinar

STORMWATER MANAGEMENT

February 2014

TECHNICAL SEMINAR

Webinar


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JOIN THE DISCUSSION!

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CPD CREDIT CERTIFICATES

• Qualifies in Most Jurisdictions in Canada & USA for 1 Hour Technical Informal

• Formal completion certificates are emailed within one week of attending

• Check your local guidelines if unsure of your requirements

Email Your Attendance List:

• Full Name• Title• Email

[email protected]

Will send certificate

mailto:[email protected]

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• Qualifies as 1 hour Informal (20 Professional Development Hours maximum per year)

• If you have provided an e-mail and are logged on throughout the presentation, a formal completion certificate will be sent to you within one week

• Enter CPD activities in the APEGBC On-line Reporting Centre: http://www.apeg.bc.ca/prodev/online.html

• A full copy of the Continuing Professional Development (CPD) Guideline can be viewed at: http://www.apeg.bc.ca/prodev/documents/cpdguideline.pdf

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Professional Development Hours (PDH)

http://www.apeg.bc.ca/prodev/online.html

http://www.apeg.bc.ca/prodev/documents/cpdguideline.pdf

http://www.apeg.bc.ca/prodev/documents/cpdguideline.pdf

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THE HOST

Patrick McDonald, P Eng.Business Development Engineer

Drainage Solutions

Armtec Ltd.

Email: [email protected]

cell: 514-216-8795


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• 43 locations in Canada• Approximately 2,000 employees• Exceptional product range for:

Armtec is a leading global infrastructure and construction materials company.

– Stormwater Treatment– Stormwater Detention and Infiltration


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ABOUT ARMTEC


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AGENDA

1) Regulations Overview

2) Hydrodynamic Separation

• Vortechs

• VortSentry

3) Filtration

• StormFilter

4) Detention & Infiltration

• ChamberMaxx

• Detention (PeHD, CSP, Concrete or DuroMaxx)


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Stormwater Management

REGULATIONS


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WESTERN CANADA REGULATIONS

Calgary currently has the most stringent regulations

• Require calculations showing 90% treatment of the total runoff volume

• Minimum annual TSS removal rate of 85% for particle sizes 50 um and greater for each and

every year

• Minimum one year of sediment storage capacity without scouring

• Maximum hydraulic loading rate of 27 L/s/m2

Most other cities in Alberta and British Columbia require treatment of 80% for

particle sizes 75 um and greater

We have seen quite a bit of interest in the VortClarex coalescing plate oil water

separator for use at power substations and gas stations.


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EASTERN CANADA REGULATIONS

Toronto currently has the most stringent regulations

• Require 90% treatment of the total annual runoff volume

• Require minimum annual TSS removal rate of 80% for particle sizes 20 um and greater

• Typically requires use of a filtration product

Ontario MOE has three levels of treatment, the highest requires 90% treatment of

the total annual runoff volume & 80% TSS removal for particle sizes 50 um and greater

Quebec follows NJDEP guidelines. HDS products are rated for 50% TSS removal.

Levis has unique approval based on Peclet scaling.

Most cities in the Atlantic Provinces require treatment of 80% for particle sizes

75 um and greater


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NEW NATIONAL OGS PROTOCOL/VERIFICATION PROCESS

ETV Canada, TRCA and stormwater stakeholder group created a new

laboratory protocol for oil grit separators

2013 NJDEP lab protocol used as a starting point with revisions made to meet

goals of Canadian program

Resulting protocol is most detailed and thorough created to date

Protocol mandates data collection across wide range of operating conditions

Will take several years before majority of OGS devices complete program due

to complex protocol and limited qualified 3rd party test facilities

Protocol: http://etvcanada.ca/home/protocols-and-procedures/


http://etvcanada.ca/home/protocols-and-procedures/

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HYDRODYNAMIC SEPARATION (HDS)


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HYDRODYNAMIC SEPARATION (HDS)

Standalone Treatment BMP

• New Development

• Redevelopment

• Retrofit

LID Pretreatment

• Surface Infiltration

• Subsurface Infiltration

• Rainwater Harvesting


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Low velocity vortex action

• Increases efficiency by increasing length

of flow path

• Concentrates solids in low velocity flow

field

Flow controls

• Minimizes turbulence and velocity

• Prevents flow surges and re-suspension

• Retains floating pollutants

Maintenance

• Pollutants are captured in an easily

accessed structure

HDS FUNDAMENTALS


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HDS SYSTEM SPECIFICATION

1. Target Pollutant Characteristic

• Targeted particle size or particle size

distribution

2. Numeric Performance Goal

• Removal Efficiency or Effluent

Concentration target

o Typically set at 80% removal

3. Basis for calculation

• Net annual removal

• Single event sizing


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STORMWATER RUNOFF


0

10

20

30

40

50

60

70

80

90

100

1 10 100 1000 10000Particle Size (micron)

Fra

ctio

n F

ine

r b

y W

eig

ht

(%)

Sartor & Boyd (1972)

NCDNRCD (1983)

Ball & Abustan ( 1995)

Sartor et al. (1974)

Shaheen (1975)

Ellis (1986)

Bellinger (1982)

Sansalone (8 April 1995)

Sansalone (30 April 1995)

Sansalone (15 July 1995)

Sansalone (8 Sept 1995)

Sansalone (3 Oct 1995)

CRC Project (1999)

Hopke (1980)

Kurahashi & Associates (1997)

ME DOT Road Sand Gradation

NJCAT TSS Gradation

WASDOE Sil-Co-Sil 106

NURP Average

Particle Size Distributions - Stormwater Runoff and Street Dirt

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“TSS” REMOVAL


There’s more than “TSS” in stormwater

• TSS is a wastewater method that tends to exclude larger

particles

• Suspended Solids Concentration (SSC) is a more

complete measurement of stormwater solids

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PARTICLE SIZE SPECIFICATION

• Settling velocity increases exponentially with particle diameter

• Silica based lab references available for HDS system testing

• Range of effectiveness for HDS systems is 50 microns and larger


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SIZING METHODS – NET ANNUAL REMOVAL

• Several Common Proprietary Methods

o Continuous simulation

o Binned rainfall intensities, flow rates and removal efficiencieso Probabilistic method

• All Methods require many important assumptions

o Is performance data modeled, lab or field generated?

o Are colligative properties assumed for fine particles?

o Does all rainfall produce runoff?

o Is bypassed water always clean?

• The most aggressive, least comparable sizing method


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SIZING METHODS – SINGLE EVENT

Achieve performance target at a peak flow rate

• Water quality flow rate typically calculated using the rational method Q=CiA

o i.e. 0.5”/hr * 1 acre * .9 runoff coefficient = 0.45 cfs

• May also be the peak flow rate resulting from a design storm depth

distributed over a hydrograph

o i.e. Peak intensity in 0.5” Type II storm with 30 min tc = 0.15 cfs

• Annual performance will exceed design storm performance

• Directly comparable between technologies


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SYSTEM DESIGN CRITERIA

• Identify target pollutants (TSS, oil, trash)

• Establish sizing method (WQ flow/point on a curve vs. average annual load)

• Establish water quality flow

• Calculate peak design flow

• Calculate HGL

• Size to meet WQ requirements

• Evaluate bypass requirements if Qmax > Qtreatment


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BENEFITS OF OFFLINE UNITS


• Units are designed to treat

the entire water quality flow

rate

• Offline units are better suited

in shallow applications where

longer weirs are needed to

pass the peak flows.

• Systems installed offline

prevent re-suspension of

solids in high flow situations

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HDS PRODUCTS


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VORTECHS


Key Features:

• Shallow Profile (typically 7’ inside height)

o Reduced excavation costs

• Proven Technology

o Lab + 3rd Party Field Testing, approved by

WADOE, NJDEP and others

• Targets fine particles (typically 50 um)

• Very customizable

o Pretreatment configuration

o High flows

• 3’ sump w/ unobstructed access

o Easy to inspect

o Reduced maintenance costs

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VORTECHS

Shallow Horizontal Profile


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VORTECHS

Vortech’s System


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VORTECHS


City of Victoria, BC

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VORTECHS MANAGEMENT

• Frequency

o Site specific (land use type and human activities)

o Recommend quarterly inspection in first two years

o Most systems require cleanout annually

• Maintenance Procedure

o Floatable materials removal

o Vacuum cleaning sump area

o Visually inspect internals

• Maintenance Documentation


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VORTECHS MANAGEMENT


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NEW MILLENNIUM HOMES


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VORTSENTRY

• Compact design ideal for congested sites

• Houses an internal bypass and treatment in

one structure

• Lightweight design eases installation

• Unobstructed maintenance access

• typically does not require confined space entry


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VORTSENTRY


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VORTSENTRY

• Frequency

o Site specific (land use type and human

activities)

o Recommend quarterly inspection in first two

years

o Most systems require cleanout annually

• Maintenance Procedure

o Maintain when sediment depth is 3’ in sump

o Vacuum cleaning sump area

o Visually inspect internals

• Maintenance Documentation


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VORTSENTRY


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HD SUMMARY

• Target settleable solids and floating pollutants

• Proven Technology

o Performance tested

• Standalone treatment (where regulations allow)

• Ideal pretreatment systems

o Reduce maintenance costs of land based or proprietary systems

• Ability to treat wide range of flows

• Low cost per CFS treated

Easy to inspect and maintain


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FILTRATION


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STORMFILTER: DESIGNED FOR LONGEVITY

• Cartridge hood separates media from floating

grease and gross pollutants

• Scrubbing regulators agitate media surface and

extend service life

• Flow rate controlled at 1gpm or 2gpm/sf to

extend media life

• Siphon actuated cartridge uses entire media

column, even during small events

• Media gradation selected to balance

performance and longevity


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THREE CARTRIDGE OPTIONS


27” 18” 12”

System Size

System Size

System Size

2.3 ft

3.05 ft 1.5

ft

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STORMFILTER MEDIA


PhosphoSorb™ PerliteCSF®

Leaf MediaZPG

Sediments ■ ■ ■ ■

Phosphorous ■ ■

Oil and Grease ■ ■ ■ ■

Soluble Metals ■ ■ ■

Organics ■ ■

Nutrients ■ ■ ■ ■

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STORMFILTER CONFIGURATIONS


Up to 1.2 cfs at 15 gpm

per 18” cartridge (33 l/s at 0.95 L/s per cartridge)

Vault

0.23 cfs capacity at 15 gpm per 18” cartridge

(6.5 l/s at 0.95 L/s per cartridge)

Manhole

Larger systems are available in panel vaults, box culverts, and CIP vaults

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STORMFILTER MAINTENANCE


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INFILTRATION


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CHAMBERMAXX

• Plastic open-bottom infiltration chambers

• Reduce and/or eliminate site runoff

• Meets LEED and LID objectives

• Most cost effective for shallow applications


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• Injection Molded

Polypropylene

• 51.4” Span x 30.3” Rise x

7’7” Long

• Integral End Walls

• 6% greater storage over

competitive systems

*Pre-Treatment Recommended

CHAMBERMAXX SPECIFICATIONS


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SIZING

• 76.7 CF Installed Storage Volume per middle chamber

• 6” of surrounding stone w/ 40 % porosity is standard for volume

calculation


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• Provides Maintenance Access• 20 Mil HDPE Durable Liner• Diversion Manhole w/ bypass & drain

down orifice• Maintain w/ reverse jet nozzle• C+F also available (Containment +

Filtration)

OPTIONAL CONTAINMENT ROW


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Full scale in-ground burial tests HS-20 / HS-25 live loads (AASHTO LRFD Design) 18” Minimum cover (can reduce with design modification) Chamber spacing minimum of 5 inches Maximum cover is 10’

STRUCTURAL DESIGN


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DETENTION


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BASSINS IN ALL MATERIALS


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QUESTIONS?


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UPCOMING MONTHLY WEBINARS

Monthly Webinars for Armtec

Drainage Solutions:

www.armtec.com/webinars/

Upcoming:

March 21, 12pm EST | Bridge Plate

Ron Prychitko

Randy McDonald


http://www.armtec.com/webinars/

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Today’s Host:

Patrick [email protected]

stormwater management technical seminar - armtec

Education