Stormwater Management Technical Seminar - Armtec
•Download as PPTX, PDF•
1 like•1,978 views
This document provides an agenda and information for a webinar on stormwater management. The webinar will cover regulations for stormwater management, hydrodynamic separation products including Vortechs and VortSentry, filtration with StormFilter, and infiltration using ChamberMaxx chambers. It includes details on the host and qualifications for continuing education credits for attendees.
Recommended
Recommended
More Related Content
What's hot
What's hot (20)
Viewers also liked
Viewers also liked (10)
Similar to Stormwater Management Technical Seminar - Armtec
Similar to Stormwater Management Technical Seminar - Armtec (20)
More from Communications Branding
More from Communications Branding (20)
Recently uploaded
Recently uploaded (20)
Stormwater Management Technical Seminar - Armtec
- 1. Webinar STORMWATER MANAGEMENT TECHNICAL SEMINAR February 2014 1 © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary
- 3. JOIN THE DISCUSSION! 3 © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 3
- 4. 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 webinars@armtec.com © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary Will send certificate 4
- 5. Professional Development Hours (PDH) • 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.pd f 5 © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 5
- 6. THE HOST Patrick McDonald, P Eng. Business Development Engineer Drainage Solutions Armtec Ltd. Email: patrick.mcdonald@armtec.com cell: 514-216-8795 STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 6
- 7. Armtec is a leading global infrastructure and construction materials company. • 43 locations in Canada • Approximately 2,000 employees • Exceptional product range for: – Stormwater Treatment – Stormwater Detention and Infiltration STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 7
- 8. ABOUT ARMTEC STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 8
- 9. STORMWATER MANAGEMENT AGENDA 1) Regulations Overview 2) Hydrodynamic Separation • Vortechs • VortSentry 3) Filtration • StormFilter 4) Detention & Infiltration • ChamberMaxx • Detention (PeHD, CSP, Concrete or DuroMaxx) STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 9
- 10. Stormwater Management REGULATIONS STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 10
- 11. 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. STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 11
- 12. 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 STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 12
- 13. 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/ STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 13
- 14. Stormwater Management HYDRODYNAMIC SEPARATION (HDS) STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 14
- 15. HYDRODYNAMIC SEPARATION (HDS) Standalone Treatment BMP • New Development • Redevelopment • Retrofit LID Pretreatment • Surface Infiltration • Subsurface Infiltration • Rainwater Harvesting STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 15
- 16. HDS FUNDAMENTALS 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 STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 16
- 17. 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 3. Typically set at 80% removal Basis for calculation • Net annual removal • Single event sizing STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 17
- 18. STORMWATER RUNOFF Particle Size Distributions - Stormwater Runoff and Street Dirt 100 90 Sartor & Boyd (1972) NCDNRCD (1983) 80 Fraction Finer by Weight (%) Ball & Abustan ( 1995) Sartor et al. (1974) 70 Shaheen (1975) Ellis (1986) 60 Bellinger (1982) Sansalone (8 April 1995) 50 Sansalone (30 April 1995) Sansalone (15 July 1995) Sansalone (8 Sept 1995) 40 Sansalone (3 Oct 1995) CRC Project (1999) 30 Hopke (1980) Kurahashi & Associates (1997) 20 ME DOT Road Sand Gradation NJCAT TSS Gradation 10 WASDOE Sil-Co-Sil 106 NURP Average 0 1 10 100 1000 10000 Particle Size (micron) STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 18
- 19. “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 STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 19
- 20. 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 STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 20
- 21. SIZING METHODS – NET ANNUAL REMOVAL • Several Common Proprietary Methods o Continuous simulation o Binned rainfall intensities, flow rates and removal efficiencies o 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 STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 21
- 22. 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 STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 22
- 23. 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 STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 23
- 24. 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 STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 24
- 25. Stormwater Management HDS PRODUCTS STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 25
- 26. 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 o • Pretreatment configuration High flows 3’ sump w/ unobstructed access o o STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary Easy to inspect Reduced maintenance costs 26
- 27. VORTECHS Shallow Horizontal Profile STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 27
- 28. VORTECHS Vortech’s System STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 28
- 29. VORTECHS City of Victoria, BC STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 29
- 30. 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 STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 30
- 31. 31 © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary
- 32. NEW MILLENNIUM HOMES STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 32
- 33. 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 STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 33
- 34. VORTSENTRY STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 34
- 35. 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 o STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary Vacuum cleaning sump area o • Maintain when sediment depth is 3’ in sump Visually inspect internals Maintenance Documentation 35
- 36. 36 © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary
- 37. 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 STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 37
- 38. Stormwater Management FILTRATION STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 38
- 39. 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 STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 39
- 40. THREE CARTRIDGE OPTIONS 27” 3.05 ft System Size STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 18” 2.3 ft 12” 1.5 ft System Size System Size 40
- 41. STORMFILTER MEDIA PhosphoSorb™ Perlite CSF® Leaf Media ZPG Sediments Phosphorous Oil and Grease Soluble Metals Organics Nutrients STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 41
- 42. STORMFILTER CONFIGURATIONS Vault Manhole 0.23 cfs capacity at 15 gpm per 18” cartridge (6.5 l/s at 0.95 L/s per cartridge) Up to 1.2 cfs at 15 gpm per 18” cartridge (33 l/s at 0.95 L/s per cartridge) STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary Larger systems are available in panel vaults, box culverts, and CIP vaults 42
- 43. STORMFILTER MAINTENANCE STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 43
- 44. Stormwater Management INFILTRATION STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 44
- 45. CHAMBERMAXX • Plastic open-bottom infiltration chambers • Reduce and/or eliminate site runoff • Meets LEED and LID objectives • Most cost effective for shallow applications STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 45
- 46. CHAMBERMAXX SPECIFICATIONS • 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 STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 46
- 47. SIZING • 76.7 CF Installed Storage Volume per middle chamber • 6” of surrounding stone w/ 40 % porosity is standard for volume calculation STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 47
- 48. OPTIONAL CONTAINMENT ROW • • • • • STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 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) 48
- 49. STRUCTURAL DESIGN 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’ STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 49
- 50. Stormwater Management DETENTION STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 50
- 51. BASSINS IN ALL MATERIALS STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 51
- 52. Stormwater Management QUESTIONS? STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 52
- 53. UPCOMING MONTHLY WEBINARS Monthly Webinars for Armtec Drainage Solutions: www.armtec.com/webinars/ Upcoming: March 21, 12pm EST | Bridge Plate Ron Prychitko Randy McDonald STORMWATER MANAGEMENT © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 53
- 54. Join Us on Social Media! Follow us on social media to learn more about our company, projects and people, while getting all the latest Armtec and industry news. 54 © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary
- 55. Contact Your Local Rep: www.armtec.com/contact-us Today’s Host: Patrick McDonald patrick.mcdonald@armtec.com 514-216-8795 55 © 2013 Armtec Infrastructure Inc. • Confidential & Proprietary 55
Editor's Notes
- Our HDS products work well as standalone, end-of-pipe treatment systems, and can easily be implemented in a retrofit situation. They are particularly effective at removal of solids, trash and debris. Our HDS systems are also an important building block in an LID design. Now there are many challenges to an LID design from a designer’s perspective. And it’s getting a lot of scrutiny because dollars per acre goes up – and developers are always looking for ways to meet requirements more cost-effectively. And our HDS systems can do just that. They are excellent for pretreatment, so in many cases, before you do subsurface infiltration, pretreatment is a very smart practice. By removing solids, trash and debris prior to infiltration you will significantly increase the life of the infiltration system and reduce maintenance costs.
- Essentially they work by creating a low velocity vortex field. We’re optimizing conditions for settling– we’re not filtering we’re settling. We’re doing that by slowing the flow down withflow controls and that helps us minimize the turbulence. We want to retain the floated pollutants inside that structure and again maintenance access is very important to this system. Additional Notes:There are several fundamentals of hydrodynamic separation that should be noted. Most notable is the use of low velocity vortex action (swirling) to enhance settling by increasing the length of the flow path, this leads to improved efficiencyAlso the use of flow controls further enhances the performance of the system. Flow controls regulate the water surface elevation in the system which:Increase system volume maintains lower velocities and helps to sustain higher removal efficiencyreduced turbulence and velocity leading to increased performancehelps prevent flow surges, thus limiting resuspensionincreases water surface elevation to improve retention of floating pollutants. Maintenance - Captures pollutants and allows for easy removal of accumulated material during maintenance. Maintenance is easily performed through a single unobstructed access point.
- Green car –Specifications must be clear and achievable. Will look at the 3 components of a good specification
- PSD varies dramatically.Street dirt tends to be coarser. Receiving waters impacted by fines. May be same particles in different states of degradation.Targeting sediment in the 100 micron range will address a lot the street dirt.
- This slide provides a brief overview of design considerations when choosing an HDS System size, type, and configuration. Use Contech’sStormwater Design Engineers as a resource to help you choose the most effective and cost efficient solution for your site that meets all of your design requirements. This design support team is focused on stormwater treatment design and understands your local regulations and the benefits of each system and layout. They can provide a system design, CAD Detail, and cost estimate that meets your project needs.
- The Vortechs system is another of Contech’s commonly specified HDS systems due to its ability to remove relatively fine particles compared to most other HDS Systems. The Vortechs system was one of the first HDS systems on the market and is still recognized as one of the most effective designs. The Vortechs system has a large diameter swirl chamber, which creates a calm area in the center to settle finer particles. In addition, the large swirl chamber and flow controls allow a shallow system design that provides a great solution in areas of high ground water or shallow bedrock. The swirl chamber is sealed off from the rest of the vault, which reduces the required removal volume during maintenance.
- Talking Points:The horizontal profile of the Vortechs Systems results in a shallower depth of excavation. This provides several benefits:Cheaper to installDon’t have to deal with a ledge, bedrock, groundwaterNo shoring involvedAvoids utility conflicts
- This slide is a graphic of the Vortechs system design and function. The red arrows designate dirty water coming into the swirl chamber and the green arrow show clean water exiting the system.Detailed Description:Inlet – Stormwater runoff is conveyed into the system through the inlet pipe. To provide the necessary tangential inlet to the swirl chamber, the inlet pipe must enter on a corner at a 90° angle to the inlet wall.Swirl Chamber – Gravitational separation of sinking and floating pollutants is enhanced by the gentle vortex motion in the swirl chamber. Over time, settleable solids accumulated in a conical pile on the swirl chamber floor. The swirl chamber is made of marine grade aluminum to ensure a long service life in tough environmental conditions. Floatables Baffle Wall – Floating pollutants, such as hydrocarbons and debris are retained as water flows under this baffle wall.Low Flow Control – Controls discharge rate during frequent low intensity storms. High Flow Control – Controls discharge rate during peak flows.Manholes Access – Unobstructed access to pollutants stored in the swirl chamber is provided. This simplifies inspection and maintenance.
- City of Victoria, Victoria, British ColumbiaThe ChallengeRock Bay identified as the most polluted bay in the Victoria and Esquimalt Harbors, and stormwater runoff was determined to be the primary source. Bay adjacent to six-lane roadway, which serves as a major throughway into the city. Existing storm drain discharged storm flows from a 32.9-hectare (81.3 acre) area that was predominantly impervious. The SolutionVortechs System had to be connected to existing infrastructure directly underneath the roadway among the many existing utilities and fiber-optic cables.Tides and high groundwater also came into consideration due to the close proximity to the shoreline.Review of 28 years of precipitation data, determined that flow from the large drainage area could reach rates of up to 880 l/s (31.1 cfs). Cast In Place Vortechs- sized to treat 1100 l/s (39 cfs) while achieving an 80 percent annual total suspended solids (TSS) removal of particles down to the 50-micron size. Relatively small footprint made it possible to fit the tight site.Unique low profile meant a shallow excavation, which decreased time during installation, and also lessened the need for dewatering in the high groundwater environment.The ResultInstalling Reduced amount of sediments, oils, and debris being released into the harborUnobstructed access to accumulated pollutants through a manhole eases inspection and shallow system has a small pump-out volume.
- Any stormwater treatment system, whether a manufactured BMP or a land based system like a pond requires maintenance to continue to perform according to design. Each of Contech’s HDS systems allows easy access for maintenance and is designed to minimize maintenance costs. Maintenance intervals vary depending on the concentration and type of pollutants on your site. We recommend quarterly inspections of the system for at least the first two years to establish a baseline understanding of pollutant load and maintenance cycle for your site. Most sites require maintenance approximately once per year.
- New Millennium Homes, The Oaks at Calabasas, Calabasas, Calif.The ChallengeThe Oaks of Calabasas, a 550 luxury home gated community, was developed near the headwaters of the Los Angeles River. The 512-acre site is adjacent to the Santa Monica Mountain Conservancy’s permanent and pristine open space. Stormwater treatment, including incorporation of California’s trash Total Maximum Daily Load (TMDL), was of utmost importance.The SolutionTwo Vortechs model 16000 systems include a specially constructed, perforated, aluminum screen to separate the semi-buoyant pollutants and meet the trash TMDL. The systems treat a combined flow of 40.28 cfs. Precast structure splits flow evenly between the systems. HDPE manhole cover inserts, fitted with three-inch midget louvers, provide proper venting and drainage, while preventing the migration of insects into the Vortechs. The ResultThe screened areas trap virtually all neutrally buoyant particles greater than 5 mm and have a combined maximum storage capacity of 16 cubic yards.Combined sediment storage capacity of 14 cubic yards and floating debris storage volume of seven cubic yards. Each has 110 square feet of effective screen area — 51 percent open area. CONTECH Stormwater Solutions laboratory tests have shown that this screen material can pass 0.8 cubic feet per second per square foot of effective area with 1.25 inches of headloss.More Vortechs Systems retrofitted for capturing neutrally buoyant pollutants are on order for future phases of this project.
- Talking Points:Installation Steps:Contractor completes excavation and preps subgradeOrder VortSentryUnit delivered and set by contractor with equipment provided by contractor. Unit is delivered complete.Unit should be in bypass during construction or can be part of sediment control.
- Talking PointsMaintain when sediment depth is 3 feet in the treatment sump The rate at which the system collects pollutants will depend more heavily on site activities than the size of the unit (e.g., unstable soils or heavy winter sanding will cause the grit chamber to fill more quickly but regular sweeping will slow accumulation).The most effective method of excavating pollutants from the VortSentry® is to use a vacuum truck during dry weather.As no internal components block access or view of captured pollutants, maintenance is virtually identical to maintaining a catch basin with a deep sump.
- Soil percolation rates to be verified by design engineer.
- Containment Row is an inferior (as compared to traditional pre-treatment devices) sediment and pollutant collection system. First flush flows are diverted into the Containment Row via a pre-cast concrete diversion manhole with a weir. Flows are then slowly drained down via the drain down orifice located in the weir allowing the sediment and pollutants to settle to the bottom of the Containment Row. The row is wrapped with an impermeable HDPE 20 mil liner, which prevents any contaminants from entering the surrounding stone. This durable liner allows for repeated maintenance cycles as compared to wrapping the row of chambers with a geotextile, which are subject to tearing during maintenance. Again we recommend pre-treatment devices instead of the Containment Row, to provide superior performance and extend the life of the ChamberMaxx system.
- Performance TestingChamberMaxx has undergone a thorough structural analysis by structural engineers and full scale in-ground field burial tests have been performed. The chambers are structurally designed to exceed HS-20/HS-25 live loads in accordance with AASHTO (Section 12) LRFD design specifications for stormwater chambers. Structural performance is dependent on proper installation per ChamberMaxx installation guidelines.