The tried and tested RAINMAXX modular tanks is designed to provide surface water retention, surface water attenuation or surface water infiltration at a variety of depths. It is ideally suited to deeper applications and can accommodate a wide range of traffic loading, from pedestrianized areas to large parks. The modular cells combine to provide water storage structures to help with localized flood alleviation and surface water management. Each cell has a 97% void ratio and provides a highly efficient water retention, attenuation or infiltration solution.