Rudolf-Harbig-Stadion, Dresden

The full roof covering of the Rudolf-Harbig-Stadion for 32,000 spectators is a flat-roof structure with a total area of over 19,000 m². As with any flat roof, heavy rainfall and snow can quickly add up to immense loads. To convey large volumes of water safely and efficiently, siphonic (negative-pressure) drainage solutions are used. To achieve continuous full-bore flow, the cross-sections of all flat-roof outlets and pipe runs were calculated in accordance with DIN 1986-100 and precisely matched to each other. Head losses arising from the pipe route are compensated by the dimensioning of the downpipes.

The roof of the Dresden stadium is divided into 13 segments. Each segment incorporates three ACO Jet stainless-steel flat-roof outlets, connected directly to GM-X discharge pipework. The individual outlets are hydraulically balanced within the network and achieve an average of around 17 litres per second. Flow velocities are approximately 2 m/s, ensuring sufficient self-cleaning. The height difference between roof and ground is 18.6 metres, with a downpipe length of 15 metres. In the de-pressurisation section—the final part of the downpipe before the transition to the building drain—the flow velocity is reduced to below 2.5 m/s. The challenge posed by the stadium’s long roof area, which channels particularly large volumes of water during rain, was solved by adding an additional water-collecting gutter.

The ACO Jet stainless-steel flat-roof outlets form a modular system consisting of upper frames, gratings, gravel traps, flanges, extension rings, ponding rings, sealing and insulating rings, drain bodies and compensation elements. They fit perfectly with the extensive ACO GM-X system of steel pipes, safety clamps and steel couplings, which are well suited as components of rainwater pipework in siphonic drainage systems.