Types of absorption trenches and beds:

1. Drainwell plastic leach drains are the most effective absorption trenches or beds surrounded with distribution aggregate.
2. Conventional piped trench. A slotted pvc distribution pipe with distribution aggregate surround.
3. Self-supporting arch trench. An arch covered with distribution aggregate.
4. Boxed Trench. A trench made from brickwork or precast reinforced concrete surrounded by distribution aggregate.

Drainwell Pipe Connection

Pipe connection is very simple due to a 90mm cut out guide and a 150mm cut out guide in the Drainwell panels. The Drainwell Plastic Septic leech drain will accommodate up to 225mm OD PVC pipe.

Drainwell Plastic Leach Drains are used for either new builds or existing homes and buildings. These leach drains are made for the disposal of effluent from septic systems. They can also be used for plastic soakwells. Some examples of applications where leach drains are used include:

• Residential houses
• Residential sub-divisions
• Commercial projects

Are Drainwell Plastic Leach Drains Approved for use by the Dept. of Health WA ?

Yes, the Department of Health WA has approved Drainwell Modules for use specifically as Leach Drains.

Who makes Drainwell Plastic Leach Drains ?

Novaplas Group in Canning Vale manufactures Drainwell Leach Drains as well as Polypropylene Soakwells.

Drainwell Leach Drain Dimensions:

Drainwell modules are 755mm (long) x 400mm (wide) x 440mm (high).
The modules are placed either end-on-end, or side-by-side to achieve the required length.

Why is stormwater detention necessary?

Stormwater Detention is necessary due to an increase in the number of dwellings within Council areas. Increased housing density has resulted in more hard surfaces. Furthermore, the water from these surfaces needs to be discharged into the Council drainage system. As a result, stormwater detention tanks are a Council requirement in many development approval processes.

Plastic vs Concrete Leach Drains

• Drainwell Leach Drains are generally more cost effective than concrete leach drains. This is due to factors including the manufacturing process, as well as transport costs.
• Plastic Leach Drains are light weight and as a result very easy to install. On the other hand, concrete leach drains are heavy and generally need a lifting machine during the leach drain installation.
• Furthermore, Plastic Leach Drains are supplied as an unassembled leach drain kit to minimize transport costs.
• Drainwell leach drains are made from 100% recycled materials, therefore, they are environmentally friendly.
• Plastic leach drains are also chemically inert. As a result, they are not affected by harmful chemicals and will not split or decay.
• Concrete leach drains have steel reinforcing bars internally which provide the needed strength for the structural walls. Consequently, the steel bars could rust and cause the leach drain to break down and fail.

Leach Drain Kit Assembly

Components
Assembly Instructions:		First, place 1 x Large Panel onto a firm flat surface and insert 3 x small panels with the 400mm side (side with long pins) into the large panel. Use a rubber mallet, if required, to lightly tap and lock the panels together at every stage.
		Then, place a large panel on to the top of the small panels.
		Now, turn the module over and place a large panel on to the top.
		Once the above step is completed, turn the module over and place final panel onto the top of the module.

Leach Drain Design