Paving system for spillage and flood management

A paving system configured for spillage and flood water management adapted to support repeated vehicular loading comprising:

• a paving layer pervious to passage of fluids;
• a supporting substrate layer of particulate material thereunder which is pervious to passage of fluids;
• and,
• a tank or channel located under the paving layer, configured to receive and retain fluids which pass through said paving layer, said tank or channel being defined by an uninterrupted containment membrane of impermeable material configured to contain the supporting substrate layer and prevent horizontal and downward migration of fluids outward from the supporting substrate layer and thereby prevent escape of fluids from said substrate layer, for retention of liquid therein;
• wherein:
• said paving layer has passages enabling the drainage of spillage or floodwater therethrough into the substrate layer and the introduction of treatment material into said substrate layer;
• the substrate layer is comprised of particular material having a plurality of particles and is of a material which is non-friable and non-susceptible to frost;
• the particles of the substrate layer are of a shape configured to provide interstitial cavities therebetween in which draining spillage or floodwater or introduced treatment material can dwell, and are of a size in the range 15 mm to 300 mm;
• and the system is arranged to enable biological decomposition of pollutants to occur in said substrate layer.