The Ruhr is dammed at the Broicher Schlagd and flows downstream via cascades. Damming the river enables energy to be generated in the Kahlenberg hydroelectric power station [komoot.com/de-de/highlight/314657] and the water station to be operated [komoot.com/de-de/highlight/314649].
Always good to replenish your water supplies! Especially in summer you get nice cold water back in your backpack! However, if you are unlucky you have to stand in line …