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Open-Bottom Stormwater Arch Chambers & Leaching System

The cost-effective, high-capacity alternative to pipe-and-stone trenches. Engineered for rapid installation and long-term sediment management.

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High-Capacity Chamber Geometry

1150 × 800 × 510 mm (≈ 45.3 × 31.5 × 20.1 in). Large internal void maximizes water storage volume per unit, reducing the total footprint required for excavation.

Versatile Application Modes

Engineered for Detention, Infiltration, or Reuse. The open-structure design adapts perfectly to septic leach fields or stormwater holding tanks depending on your project needs.

Universal Pipe Integration

Compatible with DN100–DN300 (4–12 in) pipes. Side and end cut-outs allow for fast, direct piping connections without the need for expensive custom manifolds.

AASHTO H-20 Load Certified

Meets AASHTO H-20 / HS-20 live load standards. Robust structural design ensures safety for installation under heavy-traffic roadways and commercial parking lots.

Why Choose Open-Bottom Arch Chambers?

Built-in Sediment Management

Features a dedicated “Isolator Row” capability. Wrapped in geotextile, it traps sediment at the inlet row, protecting the downstream system from clogging. Maintenance is simple and cost-effective using standard jet-vac trucks, eliminating the need for confined space entry.

Superior Structural Integrity

Unlike concrete pipes that can crack over time, our high-density polyethylene (HDPE) chambers are chemically resistant and virtually indestructible. The arched geometry effectively dissipates heavy traffic loads (H-20) into the surrounding stone, ensuring a 50+ year service life.

Rapid, Low-Cost Installation

Lightweight and stackable design drastically reduces shipping costs. One truck can carry the equivalent of hundreds of feet of concrete pipe. The open-bottom design creates a large infiltrative surface area, often reducing the required drain field size by up to 30%.

Technical Specifications

Dimensions (L×W×H)1150 × 800 × 510 mm (45.28 × 31.50 × 20.08 in)
Pipe ConnectionsDN100–DN300 (4–12 in) via couplers or cored openings
Compressive Strength200-600kn（29.0–87.0 psi）
ConfigurationOpen‑bottom, corrugated‑wall chamber on crushed stone reservoir
Installation BaseWell‑graded, clean angular stone; non‑woven geotextile envelope as specified
Design Notes
Select cover depth and traffic loading per local code (e.g., AASHTO‑based criteria in North America) and geotechnical report.
Provide upstream pre‑treatment (sumped structures or fabric‑wrapped isolator row) to limit sediment loading and extend maintenance intervals.
Maintain setbacks to buildings and groundwater separation per local guidance and hydrogeologic conditions.

Applications & Performance

Septic Leach Fields (Drain Fields)

High-Efficiency Infiltration. Our open-bottom chambers offer a 95% void ratio, significantly outperforming traditional gravel pipe trenches. They maximize effluent treatment capacity and reduce the drain field footprint by up to 50%, making them ideal for residential septic upgrades.

Commercial Parking Lots (H-20)

Traffic-Rated Detention. Engineered to withstand AASHTO H-20 / HS-20 axle loads. These high-strength modules can be safely installed under parking stalls and drive aisles, providing large-volume underground storage without sacrificing valuable surface land.

Roadway & Highway Drainage

Flexible Linear Layouts. The modular design adapts easily to narrow roadside verges and utility corridors. Provides robust structural integrity for highway runoff capture and groundwater recharge (LID), significantly reducing the load on municipal storm sewers.

Urban Hardscapes & Podiums

Shallow-Cover Solutions. Ideal for height-constrained sites like urban plazas and podium decks. Systems can be lined with a geomembrane for watertight detention or wrapped in geotextile for infiltration, supporting diverse Low Impact Development (LID) goals.

Residential Dry Wells

DIY-Friendly Drainage. Lightweight, interlocking arches are easy to handle manually without heavy equipment. Perfect for managing roof gutter runoff and driveway drainage, creating a durable, maintainable void space superior to simple gravel pits.

Engineered Reliability (Isolator Rows)

Fully Inspectable Maintenance. Designed with integrated inspection ports and Isolator Rows (sediment traps) wrapped in woven geotextile. This feature captures debris at the inlet, ensuring long-term hydraulic performance and allowing for easy cleaning via standard Jet-Vac trucks.

Project Gallery

Septic drain field trench installation with lightweight interlocking chamber modules

Installation & Stone Backfill Requirements

Excavate and proof‑roll subgrade; remove unsuitable soils.
Place non‑woven geotextile (wrap sides/top as required by design).
Install crushed stone bed to design thickness; screed to level.
Set chambers in rows; connect manifolds and inlets/outlets (DN100–DN300).
Backfill with clean stone around chambers and to cover; compact in lifts.
Place separation layer and pavement or topsoil as specified.
Installing open-bottom leaching chambers on crushed stone base for septic or stormwater infiltration trenches

Compliance & Design Support

Engineered to meet global stormwater standards. Our system aligns with widely used guidance for underground infiltration and detention, offering project-specific compliance support.

USA / Global: Design and installation checks coordinate with ASTM F2418 (Standard Specification for Polypropylene Stormwater Chambers) and AASHTO H-20 load ratings.
Europe: Coordinate with EN 13598 standards for underground plastic drainage components
Design Assistance: We provide sealed calculations, cover depth verification for traffic loads (e.g., parking aisles), and jurisdiction-ready submittals to fast-track your approval process.

Applications & Case‑Study Scenarios

Commercial Parking

Maximize surface use by placing storage under stalls/aisles. Even distribution through headers minimizes localized scour and facilitates maintenance zones.

Roadway/Rail Adjacent

Capture runoff from impervious corridors and stage release to downstream networks per allowable discharge constraints.

Campus & Healthcare

Phased construction friendly; modular arrays adapt as buildings expand while maintaining required treatment volumes.

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