NL-4136001 Pumping polder water off the land

The Molenviergang in the Tweemanspolder in Zevenhuizen consists of four mills that have been connected in succession and which, for almost two centuries, jointly maintained the polder level. In order to bridge the height difference between the polder level and the level of the river Rotte (about 4.5 mtr), four mills are needed, since the height of a mill is at a maximum of 1.2 - 1.5 mtr.  This unique four-mill corridor was in full operation until 1952. In that year, an electric pumping station took over the task. 

The windmills are still completely intact and in the event of any calamity, they can take up their old task again.

This postcard came from Patsy (Postcrossing, 3 July 2018).