RainCatcher Graf Rain Bloc 300 Litre Storm Crate Drainage anti-flooding storm crates for rapid drainage of land. Surface water is diverted or soaks down into crates and from there dissipates into the lower ground clearing water quickly from the surface. HGV load quality and used for drives, carparks, pitches, lawns and areas prone to localised flooding. Drainage anti-flooding blocks or Graf Flood Attenuation Bloc with 300 litre capacity (95% void) for rapid drainage of land. 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 product is HGV load quality and can be used for drives, car parks, pitches, lawns and areas prone to localised flooding. The rigid crates are made in black polypropylene with dimensions 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 to achieve required capacity and design. The crates are wrapped in a non woven permeable geo-textile to slow the drainage of the rain water forming in effect a high capacity, simple and trouble free soakaway system. Where storage and reuse of the water is preferred, the block system can be wrapped in a water-proof membrane forming a large underground tank that can be pumped for other use. Alternative grades of Geo-textile and other membranes are available on request, however for the purpose of this listing you will be supplied with 100 gsm grade, approx. 2.25 sqm per crate
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