Fotovlieger (aka hanselpedia):
Callandkanaal, europort, rotterdam
Fotovlieger (aka hanselpedia):
Maeslantkering near Rozenburg, 1858
Fotovlieger (aka hanselpedia):
Maeslantkering near Rozenburg, 1869
Fotovlieger (aka hanselpedia):
Hartelkering near Spijkenisse: yearly test