The lower reaches of the Rhine
In the lower reaches after Bonn > slow current > meanders > Rhine splits into Waal, Nether-Rhine and IJssel.
Fall (verval) = difference in altitude between two points along a river
Gradient (verhang) = fall per kilometre
Example: Spijk (12 metres) and Hoek van Holland (0 metres) >> 150 km apart
Fall = 12 metres
Gradient = 12 metres : 150 kilometres = 0.08 metres per km