On sealed large areas, rainfall can quickly lead to very high flow rates of several hundred litres per second. The ACO Qmax system, with linear surface drainage, has been specially developed for the drainage and retention of large sealed surfaces with traffic loads up to Class F 900. The advantage is the low weight with a particularly robust construction. ACO Qmax system thereby withstands high loads and impresses with its easy handling and laying on the construction site. The Qmax system is an ideal component in the ACO system chain for modern rainwater management.