inflowing water from the north sea into german speicherbechen

area balance bay beltringharderkoog bird birds boardwalk coast coastal construction crucial delicate dike dock ebb electric electricity engineering ensures environmental flood flow flowing german germany horizon hydraulic inflowing inlet levels maintaining man-made manage management marshlands north plays power protection reflection region regulating reservoir rest resting river role safeguarded sea seawater serves shore sky speicherbechen speicherbecken storm structure supporting surges surrounding tides vacation vital water waterway wave waving windmills