Due to indecision and the Second World War , little action was taken . In 1950 two small estuary mouths , the Brielse Gat near Brielle and the Botlek near Vlaardingen were dammed . After the North Sea flood of 1953 , a Delta Works Commission was installed to research the causes and develop measures to prevent such disasters in future . They revised some of the old plans and came up with the " Deltaplan "
North Sea flood of 1953
North Sea flood of 1953
Delta Works