Underground Systems: Workshop & Info Session Dana Hinaman Stormwater Consultant November 8th, 2018
Stormwater Solutions HEL-COR CMP Detention System Jellyfish Filter System CDS Pretreatment System Filterra Bioretention System Terre Arch Concrete Detention System ChamberMaxx Retention System Stormwater Management StormFilter UrbanGreen Rainwater Harvesting with a SRPE Cistern Bridges, Drainage, Storm Sewer, Sanitary Sewer, Stormwater Management, Erosion Control, Retaining Walls, Roadway & Earth Stabilization
Design Example #1
Design Example #2
Design Example #3: Underground Wetpond
Underground Wetpond Weir Details Weir Details Water Quality Weir Sized for the WQ volume and orifice sized for drawdown Detention weir very downstream end of entire system Controls allowable peak flows Sized orifice for draindown time
Design Example #4
Design Example #5 Terre Arch with Water Quality Volume + 20% Sediment Storage + Flood Control
Design Example #1
Design Example #2
NJDEP Certified Products Standardized testing protocol for LAB testing 50% TSS removal for HDS products 80% TSS removal for Filter Products Extended Detention pretreatment units (HDS) should be NJDEP approved and sized / scaled per NJDEP
CDS: Key Features Adds the only non-blocking screening technology available to all the benefits of swirl concentration Captures neutrally buoyant debris, protecting downstream outlet controls and waterways Isolated sump eliminates scour Multiple configurations: multiple inlet pipes; surface inlet; offline; inline Internal or external high flow bypass Lab and 3 rd party field testing, approved by NJDEP and others
Direct Screening CDS Indirect Screening Key Features: CDS Screen captures neutrally buoyant materials missed by other separator systems 4700-MICRON Screen is hydraulically designed to be selfcleaning and will not become blocked Screen pushes debris to center to expedite settling Can be designed for various target particle sizes 2400-MICRON
Installed Internal Components Oil Baffle (over outlet pipe) Diversion Weir Separation Chamber
Installation
Installation
Maintenance Start Finish
TAPE Certified Products Standardized testing protocol for FIELD testing 80% TSS removal for Filter Products Filters should have highest level of testing (GULD) TAPE should really only be referenced for Filter Products
Stormwater Management StormFilter
Small Footprint Three Cartridge Options Low Drop 27 18 12 3.05 2.3 ft 1.5 ft ft System Size System Size System Size
StormFilter Media PhosphoSorb Perlite CSF Leaf Media ZPG Sediments Phosphorous Oil and Grease Soluble Metals Organics Nutrients
Installation
StormFilter Maintenance
What is Filterra? Filterra Pre-engineered and Pre-packaged Stormwater Bioretention Treatment: Pretreatment Top Layer (Mulch) Engineered Biofiltration Media Underdrain System Landscape Tree or Shrub Bucks County Justice Center Doylestown, PA
Key Benefits Crossridge Subdivision Richmond, VA Small Footprint Filterra typically less than 1% of drainage area Contrasts to 5%-10% for standard bioretention cells Full use of land Ideal for urban retrofit High Pollutant Removals 85% TSS 70% TP 43% TN Ease of Maintenance
Detention & Subsurface Infiltration CMP Plastic Concrete DYODS Tool Design Your Own Detention System
Key Considerations Effective depth Limiting widths/lengths Infiltration opportunities / Minimizing footprint Maintenance
Concrete: Terre Arch Terre Arch 26 (TA26) 4 connected arches Each arch: 26 tall x 52 wide Total size: 8 x 19 x 32 238 cf storage per piece Terre Arch 48 (TA48) 3 connected arches Each arch: 48 tall x 72 wide Total size: 8 x 20 x 55 514 cf storage per piece
Terre Arch Benefits Modularity fits into any project size HS-25 load bearing rating with 12 cover from top of arch to top of pavement Quick easy installation minimizes handling & installation cost (30,000 to 50,000 cft/day) Only chamber or crate solution that can be fully physically accessed
Distribution Box
Concrete: Terre Arch
End Caps
Conseal Between Arches
Plastic: ChamberMaxx Plastic open-bottom infiltration chambers Reduce and/or eliminate site runoff Meets LEED and LID objectives Cost effective for shallow applications
Sizing 49 CF of storage per chamber 76.7 CF of installed storage volume Std. = 6 of surrounding stone w/ 40 % porosity 30.3 51.4
Structural Design Can handle HS-20 / HS-25 and HL-93 live loads 18 in minimum cover and 8 ft maximum cover Standard Chamber Spacing 5.6in
ChamberMaxx Installation
Vertical Cross-Section Comparisons 12 (min) 12 (min) 12 (min) 60 78 9 (min) 3 (min) 60 Chamber Effective Depth: 7.75 feet 78 CMP Effective Depth: 7.75 feet
Plastic: DuroMaxx Strength and durability Available up to 120 diameter Joint tightness available for all applications Used for CSO overflow, cistern / tank application, glycol storage
Joint Options - Gasketed & Welded Soil Tight Culvert Joints Plain End Pipe with Flat Steel Bands and Gaskets, Not Watertight Non-Reinforced Bell & Spigot Ends, Watertight to 3 psi Reinforced bell & Spigot, Watertight to 15 psi Welded Joints, Watertight to 30 psi
CMP Flexible configurations and coatings Typically aluminized Fully perforated pipe available Diameters from 12 to 144 Relatively low cover requirements
CMP Larger pipe provides storage at a lower cost per cubic foot 96 Dia 50.2ft 3 /ft 48 Dia 12.5ft 3 /ft 2x the diameter = 4x the storage
Pipe Configuration Barrels Manifold / Header
Manholes
Outlet Control Structures
DYODS
DYODS
Engineering Drawings
Your Local Stormwater Team Dana Hinaman, Stormwater Consultant Kelsey Stevens, Stormwater Design Engineer Nick Rein, Sales Engineer Samantha Brown, Regional Regulatory Manager
QUESTIONS?