Dyrhoff is a designer and supplier of pneumatic water control systems. Its products include inflatable rubber dams and pneumatic spillway gates for applications such as hydropower, flood management, water supply, inland navigation, sewer flow management and surge control. Dyrhoff has installed over 60 systems since the early 1990s and holds the exclusive worldwide license to design and supply Sumitomo manufactured rubber dams. It is also the European agent for the Obermeyer spillway gate.