Jensen ZeroTrash Baffle Box
Screened stormwater pretreatment for trash, sediment and leaf litter
Jensen ZeroTrash Baffle Box
Trash and leaf litter don’t just look bad — once captured, decomposing organics leach nitrogen and phosphorus right back into the next storm.
The ZeroTrash Baffle Box is a precast hydrodynamic separator with a screened debris-capture system that holds trash and organics in a dry, separated state above the wet sediment zone, reducing nutrient leaching between storms.
Multi-chamber baffles settle sediment and resist scour — capturing trash, TSS, organics, and oils as a pretreatment or primary-treatment device.
Capture the Debris — and Keep Its Nutrients Out of the Next Storm
A conventional baffle box catches trash and organics, then lets them sit in standing water where decomposing leaves and grass leach nitrogen and phosphorus back into the flow.
The ZeroTrash Baffle Box is built to prevent that. Stormwater passes through a multi-chamber baffle layout that slows flow so sediment settles into the sumps, while a screen captures floatables, trash, and organic debris and stores them in a dry, separated state — away from the standing water — to limit nutrient leaching between events.
Internal baffles and deflectors control turbulence and keep previously captured material from scouring back out during larger storms. It’s a physical separation device — sedimentation, screening, and gross pollutant capture — best positioned as pretreatment or primary treatment ahead of other BMPs.
01
Inflow
Storm Drain
02
Multi-Chamber Baffles
Slow + Settle
03
Screen
Capture Floatables
04
Dry Debris Storage
Less Leaching
05
Sumps
Settled Sediment
06
Bypass
No Scour
01
Inflow
Storm Drain
02
Multi-Chamber Baffles
Slow + Settle
03
Screen
Capture Floatables
04
Dry Debris Storage
Less Leaching
05
Sumps
Settled Sediment
06
Bypass
No Scour
The ZeroTrash Baffle Box is a pretreatment stage of a complete treatment train — Jensen builds the filtration, detention storage, and reuse pumping too, so the whole system is engineered together.
How it works.
It’s a physical separation device — not a media filter or biological system. Treatment happens through sedimentation, screening, and hydrodynamic flow control across multiple chambers.
Multi-Chamber Sedimentation
Flow passes through a multi-chamber (triple-chamber) baffle layout that reduces velocity so heavier suspended solids and sediment settle into the sump areas.
Screened Debris Capture
A screen system captures floatables, trash, leaf litter, and organic debris — separating gross pollutants from the treated flow.
Dry-State Organic Storage
Captured organics are held in a dry, separated state above the wet sediment zone — reducing the nitrogen and phosphorus that leach from decomposing debris between storms.
Multi-Chamber Sedimentation
Flow passes through a multi-chamber (triple-chamber) baffle layout that reduces velocity so heavier suspended solids and sediment settle into the sump areas.
Screened Debris Capture
A screen system captures floatables, trash, leaf litter, and organic debris — separating gross pollutants from the treated flow.
Dry-State Organic Storage
Captured organics are held in a dry, separated state above the wet sediment zone — reducing the nitrogen and phosphorus that leach from decomposing debris between storms.
Anti-Scour Baffles & Deflectors
Internal baffles and deflectors control turbulence and keep previously captured sediment from scouring back into the flow during larger storm events.
ZeroTrash Baffle Box
What's inside.
- Inlet pipe
- Inlet Ramp
- Full Capture Trash Screen
- Turbulence Deflectors
- Sediment Baffle
- Oil Skimmer Baffle & Hydrocarbon Booms
- Sliding Screen Lids
- Access Cover
- Outlet Pipe
What it removes.
Targets gross pollutants and the nutrients bound to organic debris and sediment. It is a solids/gross-pollutant separator, not a dissolved-nutrient or media-filtration device.
- Trash & Floatables
- Leaf Litter & Organics
- Sediment & TSS
- Oil & Grease
- Nutrient-Associated Solids (N / P)
Flow Paths
Treatment flows up to the design storm flow up the inlet ramp and into the trash filtration screen. During higher peak flows water bypass around the filtration screen.
Bypass Flow
Bypass Flow
Treatment Flow
ZeroTrash Baffle Box Configurations
Inline Type
The standard multi-chamber baffle box installed directly in-line on the storm drain; higher flows pass through while captured material is retained without scour.
Offline Type
Set beside the main line with an upstream diversion, so only the treatment flow is routed into the unit while peak flows stay in the main line.
Full Height Trash Cage
Best for offline designs and additional trash capture capacity with where peak flow are minimal and head loss through the system is not a major concern.
Sliding Top Doors
Best for online retrofit applications where head loss needs to be kept at a minimum along with higher peak flow rates that need to be bypassed.
Engineering Support
Get specs, drawings, or application support from our engineering team.
Simple, Routine Maintenance
Maintenance is performed from the surface with a standard vacuum truck — and because organics are held dry and separated, captured trash and leaf litter are easier to remove before they break down.
01
Vacuum-Truck Cleanout
Captured trash, organics, and accumulated sediment are removed from the chambers and sumps with a standard vacuum truck.
02
Dry Debris Is Easier to Service
Holding organics in a dry, separated state means debris is removed before heavy decomposition — and before nutrients leach back out.
03
Routine Inspection
Regular inspection and scheduled cleanout keep the unit performing — frequency depends on trash and sediment loading at the site.
01
Vacuum-Truck Cleanout
Captured trash, organics, and accumulated sediment are removed from the chambers and sumps with a standard vacuum truck.
02
Dry Debris Is Easier to Service
Holding organics in a dry, separated state means debris is removed before heavy decomposition — and before nutrients leach back out.
03
Routine Inspection
Regular inspection and scheduled cleanout keep the unit performing — frequency depends on trash and sediment loading at the site.
Easy Maintenance Access
Sliding top doors can slide open (if applicable) and the bottom of the filtration screen has hinged doors to allow for access and removal of sediment below the screens.
How to Get Started
You have your workflow. We fit into it — not the other way around.
01
Request Sizing
Share your treatment flow rate, inlet/outlet layout, and trash/sediment loading. We’ll size the unit and return a preliminary layout.
02
Get Drawings Fast
With sizing confirmed, we turn around project-specific drawings and submittals in days — not weeks.
03
Engineering Review
We confirm hydraulics and treatment flow, review applicable compliance pathways, and provide stamped submittals.
04
Delivery & Installation Support
The unit sets in a precast vault using standard methods — we coordinate delivery as part of a complete precast package and support installation through final inspection.
ZeroTrash Baffle Box Installation
Complete Your System
The ZeroTrash Baffle Box is a pretreatment stage that protects everything downstream. Add filtration for water-quality polishing, detention storage for volume control, and a pump station for reuse. Jensen engineers and manufactures all of it, often as one complete precast package — one partner, one set of drawings.
01
Conveyance In
RCP / Box Culvert
02
ZeroTrash
Pretreatment
03
Filtration
AtlanFilter / Biofilter
04
Detention
StormVault / Panel Vault
05
Pump Station
Reuse / Lift
06
Discharge
Drain / Infiltrate
01
Conveyance In
RCP / Box Culvert
02
ZeroTrash
Pretreatment
03
Filtration
AtlanFilter / Biofilter
04
Detention
StormVault / Panel Vault
05
Pump Station
Reuse / Lift
06
Discharge
Drain / Infiltrate
Every component above is engineered and manufactured by Jensen.
Other Separators
The JDS hydrodynamic separator offers alternative or complementary trash, sediment and oil capture.
Other Separators
The JDS hydrodynamic separator offers alternative or complementary trash, sediment and oil capture.
Filtration & Polishing
AtlanFilter
AtlanFilter cartridge filtration and the Jensen Biofilter provide advanced water-quality treatment downstream.
Storage
StormVault and Panel Vault systems for detention, retention, and infiltration — volume control that ZeroTrash protects from trash and grit.
ZeroTrash Baffle Box Technical Documents
Everything an engineer needs to design, permit, and build — drawings, specs, manuals, and brochures, available as PDF and CAD (upon request).
Product Downloads & Specs
Product Drawings
Take the next step.
Talk with a Jensen expert to discuss designing in a ZeroTrash Baffle Box for your project, or schedule a Lunch & Learn with our team
Or call us at 775-352-2700