An eastern port area was created separated from the rest of the port by the forming an artificial lake 26 m above sea level. The water level is maintained by ensuring that rainwater is channeled into the basin. Excess water is drained to the north side onto a bed of gravel. In case of drought a solar-powered fountain with an annual capacity of 90,000 m³ has been installed by the Hanse canal. Pre-treatment of the water supply is provided by small biotopes at the southern end of the canal.