Aquavoid®-Metro storage tanks provide an economic versatile storage system for general use and has been designed specifically to meet the needs of sustainable construction as advocated by the UK Government and provides the means for rainwater, collected from roofs and pavements, to be infiltrated into the soil. The sewage system is relieved of additional loads and drying out of the sub-surface can be prevented.

Used as a soakaway
Rainwater collected through pipes from the roof and/or road can be slowly infiltrated into the soil. By infiltrating relatively clean water into the soil, the drainage system is relieved and drying out of the sub-surface can be prevented. Infiltration of rainwater is part of sustainable construction as advocated by the UK Government.

Used as an attenuation system
When normal drainage systems cannot cope with the volume of surface water this is diverted into the Aquavoid® storage system and released slowly after the storm has passed avoiding localised flooding.

When creating a soakaway, these underground storage units are wrapped in a heavy-duty non-woven, needle-punched geotextile to allow water discharge to the subsurface, but prevent any soil or sand particles to go through.

The construction of an attenuated structure is almost identical to that of a soakaway with the exception of the structure being wrapped within a geomembrane as well as a geotextile to create a sealed system allowing temporary storage of the stormwater until the storm has passed.

Advantages and benefits

• High bearing capacity - sufficient for pedestrian, traffic and general use
• Large storage capacity - 95.5% voids
• Economic to install and maintain
• Prevents extreme peak flows to main drainage and water purification systems
• Rainwater is 'cleaned' by geotextile surround
• Decreases flooding during heavy rain falls
• Promotes the balance in the groundwater position
• Decreases environmental problems caused by development
• Flexible – can easily be expanded in all directions
• Suitable for high and low groundwater situations
• Inlets / outlets: 110, 160 & 200mm dia pipes (larger diameters to order)

Applications

• Car parks
• Landscaped areas
• Recreational areas
• Amenity areas
• Caravan sites
• Commercial sites

Overview

Vertical strength: 400kN/m2 
Lateral strength: 85kN/m2

Crate size: 1200 x 600 x 300mm, Base plate: 1200 x 600 x 20mm.
Void ratio 95.5% (4.63 units/m3) – effective capacity @ 95% 204 litres