Septic Leach Drainage

Ausdrain™ septic leach drains, otherwise known as absorption trenches, are practical, cost-effective and easy to install.

The EnviroModules are lightweight, have an open structure providing high flow rates and are extremely robust enabling installation under trafficable areas such as carparks and driveways. AUSDRAIN EnviroModules are delivered to site in flat-pack form saving on transportation costs. The modules feature a slide and lock assembly function that minimises the time and effort required to assemble each module. Once assembled the modules are easily carried and lifted by hand into the trench. They are then placed end to end in a line and covered on the top, sides and ends with a recommended geotextile. AUSDRAIN has further simplified the installation of leach drains with the 150mm pipe connector. The connector clips effortlessly to the top, side or end of the module, providing a positive and secure connection for PVC inlet pipes and inspection ports. The fabric can then be easily stretched and clamped over the connector. Reducers can be used for smaller pipe diameters. The AUSDRAIN leach drain system has been approved by councils and regulatory authorities including the Department of Health in Western Australia and the Northern Territory.

Applications of EnviroModule™2 Septic Leach Drains:

Residential projects, sub-divisions, commercial projects

Related Products

Installation Procedure for Septic Leach Drain

1. Excavate trench allowing for 100mm to each side of the drain and 400mm above the drain to the surface. Level base using a 50-100mm layer of sand.

2. Assemble the modules using 4 sides and 3 braces for a non-trafficable landscaped area and 4 sides and 4 braces for a trafficable area. Please note that a suitable pavement consisting of road base and bitumen or a re-enforced concrete slab is required over the drain for trafficable situations.

3. Place the modules end to end along the length
of the trench ensuring the 450mm side is in the upright position.

4. Attach the 150mm pipe connectors where required to the modules for inlet and inspection pipes.

5. Cover the top, sides and ends of the drain with the geotextile provided. If overlaps are required use a minimum of 300mm.

6. Cut an X in the fabric at each connector and seal the fabric to the connectors using adjustable clamps.

7. Backfill with coarse washed river sand to the sides of the drain and 100mm over the surface of the drain.

8. Place a minimum of 300mm of clean fill/topsoil over the sand layer and compact using machinery on tracks not exceeding 8 tonnes.

EnviroModule™2 Technical Data

Length

600mm

MAXIMUM COVER REQUIRED

Width

400mm

Standard Duty Module

1200mm

Height

450mm

Extra Duty Module

1800mm

Weight

4 - 5kg

Heavy Duty Module

1200mm

Void Area

95%

OVERALL MAXIMUM DEPTH

Storage Volume

105L

Standard Duty Module

2400mm

Unrestricted Flow Rate

3510l/m

Extra Duty Module

3000mm

COMPRESSIVE STRENGTH

Heavy Duty Module

2550mm

Standard Duty Module - 3 brace: 27.5 tonnes/m2

MAXIMUM MODULE HEIGHT

Extra Duty Module - 4 brace: 37.5 tonnes/m2

Standard Duty Module

1800mm

Heavy Duty Module - 5 brace: 42.5 tonnes/m2

Extra Duty Module

2250mm

MINIMUM COVER REQUIRED

Heavy Duty Module

1350mm

Standard Duty Module

400mm

Service Temperature

- 30°c + 120°C

Extra Duty Module

400mm

Module Material

Recycled Polypropylene

Heavy Duty Module

1000mm

Want to know more about how to use EnviroModule™2 in septic leach drains?

Download our EnviroModule™2 Septic Leach Drain Brochure below:

Septic Leach Drain Brochure