Kammala wannan jumla: An kammala Grevelingendam tsakanin Goeree-Overflakkee da Schouwen-Duiveland a shekarar 1965. Gravelingen da ke kudu da Goeree-Overflakkee har yanzu suna da alaƙa da Tekun Arewa. Saboda haka guguwar ta iya zama mafi girma a nan, saboda haka an ɗaga dams a gefen kudancin tsibirin a 1965. An fara gina Brouwersdam nan da nan bayan an kammala Gavelingendam don rage lokacin ambaliyar ruwa. Bayan fiye da shekara shida, a lokacin bazara na shekara ta 1971, an gama gina madatsar. Tsakanin 1964 da 1971 akwai wasu matakan ruwa masu yawa. A watan Nuwamba na 1966 ruwan ya kasance santimita kaɗan ne kawai a ƙarƙashin matakin sanannen
ambaliyar ranar 1 ga Fabrairu, 1953.