Drainage anti-flooding blocks or Graf Flood Attenuation Bloc with 300 litre capacity for rapid drainage of land. Used as part of your SuDS solution. Surface water is diverted or soaks down into weight resistant crates and from there dissipates slowly into the lower ground clearing water quickly from the surface.
This model is HGV load quality and used for drives, car parks, pitches, lawns and areas prone to localised flooding.
The rigid crates are made in black polypropylene (PP) and measure 1200mm (l) x 600mm (w) x 420mm(h) and will hold a maximum capacity of 300 litres gross or a working volume of 285 litres. To build the attenuation system, the blocks are connected together into a matrix.
In areas where water storage is not a consideration, the crates can be wrapped in a geo-textile to slow the drainage of the water – forming in effect a large soakaway.
Where storage and reuse of the water is preferred, the block matrix is wrapped in a water-proof membrane forming a large underground tank that can be pumped for other use.
Geo-textile and other membranes are available.
