In the lock system at Brunsbüttel, the tidal difference in water levels between high and low tide can be overcome up to an extreme value of 6 m (from NN +3.00 m to NN – 3.00 m).
In Kiel-Holtenau, this difference averages around 40 cm.
The water is balanced in the lock chamber by circulation channels in the lock structure. No pumps are used.
Following the force of gravity, the water flows into the area with the lower water level. The changing water level raises or lowers a ship. The chambers of the small locks are equipped with stem gates. There are stem gates installed in the chambers of the small locks. There are ebb and flow gates. At corresponding water levels, a pair of gates is opened or closed. In total, there are about 8 wing gates per chamber, which are moved by hydraulic cylinders.
The required dewatering of the NOK at the specified water levels is achieved by the specific water levels required for the drainage of the NOK are achieved by appropriate installations in the star gates.
In the two large lock chambers, sliding gates weighing up to 1.500 tons close the lock. The gates are located in the “heads” of the lock. They are driven by electric motors via gear wheels and chains and run on rails. The inland head is on the canal side, the outer head faces the Elbe or Kiel Fjord.
Pictures: Circuits of the new lock