The Hadelner Canal combines with the Bederkesa-Geeste Canal to create the Elbe-Weser continuous inland waterway. The Hadelner Canal lock also fulfils another important function in addition to being a ship lock: This additional function is the drainage of the so-called Sietland area (“siet”" = low) with discharge direction to the Elbe. Since the lock also passes through a coastal protection dyke, which must be brought up to the current coastal protection level, this major project is also classified as an urgent coastal protection measure.
A new sluice structure and lock structure now fulfils all the requirements. As part of the new system, a pumping station comprising three pumps is being built in the area of the outlet towards the Elbe. Each of these pumps will have a capacity of 4 m³/s and will be able to pump the water from one drainage channel via a (DN 1400) pipe into the Elbe.
BÜSCH supplies the executing consortium of Ludwig Freytag/TAGU with three DN 1400 flap covers with impact absorbers for utilisation in pump pressure pipework. The three non-return flaps are built into the area of the pipe outlet and should prevent the water from the Elbe from being forced into the pipework during flooding.