H-20 High-Capacity Leaching Chambers for Septic & Stormwater

The robust, traffic-rated alternative to pipe and stone. Maximize infiltration for septic drain fields and commercial stormwater management. fast installation & 50% space savings.

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Module size

1150 × 800 × 510 mm (≈ 45.3 × 31.5 × 20.1 in)

Configurations

Detention / Infiltration / Reuse

Pipe connections

DN100-DN300（4-12 in）

Raffic rating

AASHTO H-20/HS-20

Why This Chamber Stands Out

Cost & Speed

Fewer trucks, fast setting, and modular arrays reduce project staging needs versus large-diameter pipe systems. Lower labor and crane requirements help accelerate schedules.

Performance & Footprint

High void storage in the stone reservoir and open-bottom infiltration maximize usable volume beneath parking and landscaped areas while protecting groundwater quality with upstream pre-treatment.

Sustainability

Compatible with recycled aggregates and geotextiles; supports Low-Impact Development (LID) with infiltration and groundwater recharge strategies.

Technical Specifications

Dimensions (L×W×H)	1150 × 800 × 510 mm (45.28 × 31.50 × 20.08 in)
Pipe Connections	DN100–DN300 (4–12 in) via couplers or cored openings
Compressive Strength	200-600kn（29.0–87.0 psi）
Configuration	Open‑bottom, corrugated‑wall chamber on crushed stone reservoir
Installation Base	Well‑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, maximizing effluent treatment capacity. Replaces traditional stone trenches to reduce footprint by up to 50% and allows for rapid installation in residential septic systems.

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 driveways, providing large-volume underground storage without sacrificing valuable surface land.

Residential Dry Wells

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

Roadway & Highway Drainage

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

Urban Hardscapes (LID)

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

Engineered Reliability

Fully Inspectable System. Designed with integrated inspection ports and sediment management features (isolator rows). Ensures long-term performance and easy cleaning for both detention and infiltration configurations.

Project Gallery

Large scale underground stormwater retention basin using high-capacity plastic chambers

Septic drain field trench installation with lightweight interlocking chamber modules

Installation Overview

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 Coordination

Aligns with widely used guidance for underground infiltration/detention systems. Project‑specific compliance varies by jurisdiction.

For polypropylene stormwater collection chambers, designers often reference ASTM F2418; installation and design checks may coordinate with AASHTO/ASTM resources and local stormwater manuals.

European projects may coordinate with EN 13598 family for underground plastic drainage components and local stormwater requirements.

Request sealed calculations, cover depth verification under traffic (e.g., parking or drive aisles), and jurisdiction‑ready submittals.

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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FAQ

How is outflow controlled in a detention configuration?

Outflow is governed by outlet device sizing (e.g., orifice/weir) and its invert elevation relative to the chamber bed. A manifolded outlet or header can fine‑tune stage‑discharge. Final settings are per project hydraulic design.

What maintenance does the system require?

Recommended practices include upstream pre‑treatment (e.g., sumped structures or an isolator/pre‑treatment row), routine visual inspection through ports, and sediment removal with a vacuum truck when thresholds are met—minimizing the need for wash water. Inspection frequency is increased after major storm events and adjusted for land use.

Can chambers be installed beneath traffic areas?

Yes—subject to cover depth and live‑load checks per local standards (e.g., AASHTO‑based criteria). The allowable loading depends on soil conditions, cover, and pavement structure verified by a professional engineer.

What is an “isolator row” and when should I use one?

An isolator (pre‑treatment) row—often wrapped in geotextile—concentrates sediment for easy access and cleaning, protecting the main stone reservoir and extending service life.

Do I always need crushed stone backfill?

Clean, angular stone is typical for structural and hydraulic performance. Some well‑graded native soils can be suitable when properly compacted; follow the project specification and local standards.

Is stacking or tiered installation possible?

Some chamber systems have been engineered for multi‑layer installations on specific projects. Whether stacking is appropriate depends on structural design, cover depths, and jurisdictional approval. Consult project‑specific engineering.

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