Detention & Infiltration
Your site has volume requirements and a tight footprint. Our modular precast vault and chamber systems store stormwater underground. We offer the fastest and shortest lead times in the west. Built on 50+ years of box culvert expertise, now optimized for stormwater storage.
Problems Solved
You’re managing peak runoff rates, meeting volume control requirements, and trying to maximize developable land all at once. Detention basins eat up usable acreage. Other systems come with long lead times and inflexible designs. Our underground detention systems handle volume control while giving you back the surface for parking, landscaping, or buildings.
Flood Control
Manage peak discharge rates and meet flood control mandate
Flood Control
Manage peak discharge rates and meet flood control mandate
Infiltration Ready
Meet infiltration requirements with permeable base integration
More Usable Land
Maximize developable land – build above your storage
Faster Delivery
Reduce project risk with fast drawings and short lead times
How Underground Detention Works
Underground detention systems temporarily store stormwater runoff during peak events, then release it at a controlled rate that meets municipal discharge requirements. The system sits beneath parking lots, landscaping, or buildings so you don’t lose usable land to open detention ponds.
Step 1
Stormwater enters
Step 2
Pretreatment
Step 3
Detention storage
Step 4
Controlled release
Step 5
Discharge
For infiltration applications, the vault sits on a permeable aggregate base with openings in the floor slabs. Water percolates into native soil, recharging groundwater and meeting LID requirements. Jensen engineers evaluate your soil conditions and design the system accordingly.
Applications
Commercial
Commercial
Residential
Transportation
Municipal
Configurations
Every site is different. That's why we offer various configurations.
Detention
Detention systems provide temporary storage of runoff beneath the surface during and immediately after storm events, reducing peak discharge rates and helping protect downstream waterways and infrastructure from flooding and erosion.
Detention
Detention systems provide temporary storage of runoff beneath the surface during and immediately after storm events, reducing peak discharge rates and helping protect downstream waterways and infrastructure from flooding and erosion.
Infiltration
Infiltration systems are designed to capture, store, and gradually infiltrate stormwater runoff into the surrounding soil, helping to restore natural groundwater recharge and reduce the volume of runoff leaving a site.
Reuse
Reuse systems are designed to capture, store, and supply harvested stormwater for beneficial non-potable applications such as irrigation, toilet flushing, industrial processes, and vehicle washing.
Products
Panel Vault
When a site needs high-volume underground storage in a footprint that won’t conform to fixed module sizes, a panel vault gives you a custom-built basin.
Dry Well
Our dry well infiltration systems offers effective solutions for stormwater management and groundwater recharge. Designed with sustainable development and water conservation in mind, these systems showcase Jensen’s commitment to quality, durability, and high-performance engineering.
Box Culvert
Precast concrete culvert are box shaped configurations used for transportation infrastructure, stormwater management, and multiple other applications. Engineers and contractors use our culvert products for everything from bridges and streambeds to underground storage and utility vaults.
Contact us for custom solutions
Request Consultation
How to Get Started
You have your workflow.

We fit into it, not the other way around.
01
Request Sizing
Share your hydrology data and storage requirements. Our engineers will size a system and return a preliminary layout.
02
Get Drawings Fast
Tell us your site constraints. We’ll turn around project-specific drawings in days, not weeks.
03
Engineering Review
We’ll review your design, confirm hydraulic calcs, verify agency compliance, and provide stamped submittals.
04
Installation Support
From delivery coordination to on-site technical support, we stay with your project through final inspection.
Complete Your System
Underground detention systems temporarily store stormwater runoff during peak events, then release it at a controlled rate that meets municipal discharge requirements. The system sits beneath parking lots, landscaping, or buildings, so you don’t lose usable land to open detention ponds.
01
Conveyance In
RCP
Box Culvert
02
Pretreatment
JDS
Catch Basin
03
Detention
StormVault
04
Treatment
Filter
Biofiltration
05
Pump Station
Reuse
Lift
06
Discharge
Storm drain
Infiltrate
01
Conveyance In
RCP
Box Culvert
02
Pretreatment
JDS
Catch Basin
03
Detention
StormVault
04
Treatment
Filter
Biofiltration
05
Pump Station
Reuse
Lift
06
Discharge
Storm drain
Infiltrate
Every component above is engineered and manufactured by Jensen.
Treatment
Improve Water Quality
Separators, filters, and biofiltration to meet water quality permit requirements. NJDEP certified, TAPE approved, CA Water Board compliant.
Treatment
Improve Water Quality
Separators, filters, and biofiltration to meet water quality permit requirements. NJDEP certified, TAPE approved, CA Water Board compliant.
Conveyance
Move Water Efficiently
Reinforced concrete pipe, box culvert, and drainage structures manufactured at Jensen plants across the West for fast, local delivery.
Pump Stations
Optimize Water Flowrate
Precast pump stations for stormwater reuse, lift applications, and sites where gravity discharge isn’t feasible.
Engineering Support
Get specs, drawings, or application support from our engineering team.
Take the next step.
Talk with a Jensen expert to find the right solution for your project, or schedule a Lunch & Learn with our team.
Or call us at 775-352-2700