① memo 20180916 ~ Mill #2 ~ The second mill of the quartet of windmills working together to keep the polder dry west of the village Aarlanderveen (Alphen) in the Green Heart of Holland . The waterway drains into the Old Rhine nearby.
Mill #2 (dutch ‘Molen 2’ or ‘middenmolen’) is not turning in this video .. it’s the nearby model mill that is turning.
These are the only mills in the world that are still being used as main dewatering for a polder.
Recently the dutch decided to start using again such historic polder water windmills everywhere in the Netherlands to assist the modern electric dewatering pumps if needed .