Geocell Drainage Crates

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Benefits:

● Quick installation – reduce site access delays
● Increased land usage – tanks are sub surface
● Economical – generally more cost efficient than any other equivalent sealed tank
● Cost effective – reduced costs for excavation and disposal of material
● Modular – easy to create any shape
● Strong – designed to support shear loading
● Lightweight – no cranes required
● Determinate volume – one cubic metre of matrix tank modules contain 950 litres of water, whereas stone fill will only provide 300 litres of storage per cubic metre.

Soakaway:

The soakaway is best assembled as a very long narrow structure. The inlet pipe comes in at roof level and faces downwards so the water may percolate in the tank. The blocks are wrapped in Geotextile, to protect them and to keep clay from filling the vacant space. An air vent pipe is installed on the maximum height stage using a cowl on top or it may be vented into a coil manhole. There’s no socket out of soakaway drainage crates, therefore no flow control unit is necessary.

How it works – Geocell Drainage Crates:

Stormwater enters the soakaway crate attenuation tank through the input manhole, which incorporates a silt collection sump along with a galvanised leaf set basket. Water moves through the tank and leaves through the outlet manhole, which comprises an AquaBrake flow control device. This flow control device modulates the release speed of water in the tank, and in so doing, enables the tank to fill. As a result of water entering the tank at a greater speed than it might leave, the void space subsequently fills with water. The Inlet/Outlet pipe will be a flushing station. This perforated pipe is wrapped completely in High Flow Filtering Geotextile, which prevents silt entering the block area. As the tank continues to empty in a pre-determined pace, air re-enters the tank through precisely the same air port system. The roof of the completed tank has to be lower than the cheapest gully trap onsite.

Design Criteria:

The attenuation tank is constructed using plastic matrix module cubes. These blocks can take passing loads up to 40 tonnes/m2. Every soakaway crates void ratio is 95%. The tank is sealed with a layer of geotextile membrane, which can be fully welded to create a 100% seal. All pipe penetrations should be sealed into the membrane. A layer of heavy duty protection geotextile shields the membrane, to prevent damage from construction or backfilling. A range of air extraction vents/flushing points are subsequently placed in the roof of the tank.

Note:

It is vital that the tanks are sealed because silt particles and dirt water may enter the void space and lower the void capacity. The base of the tank has to be 500mm above the ground water level. Flooring water relief steps have to be put into position.

SPECIFICATION (Single Drainage Crate)

• Weight (maximum): 7.1kg
• Crush Strength (up to): 400kN/m2
• Lateral Strength: 80kN/m2
• Minimum Cover: (green areas) 500mm(trafficked areas) 650mm
• Maximum Cover: 3m
• Material: Polypropylene
• Void Ratio (Internal): >95%

Design Requirements:

• Tank storage capacity (m3)
• Depth restrictions
• Location (Road, Car Park, Green Area)
• Design constraints on site

* Modules tested using UKAS calibrated test machine, range 0 – 60 Tons, UDL, loading rate 0.2 kN/m2
** Modules tested for long term creep testing for 90 days and new on-going test.
# Any cover less than 450 mm – contact us

Geocell Soakaway Crate Brochure
Geocell Installation Guidelines