Dry river

The river is emptied temporarily on water. Scaffolding must be erected at one of the old industrial buildings, which today is a museum. The building needs renovation. It is interesting to see the river water-drained. Next week the river will be totally without water while they build the scaffolding. After that work the river will be filled with water again.
First extra: shows the river outside the museum. Here you can see that the water level is about 3 meters lower than normal.
Second extra: the waterfall along the walkway. The two pigeons is sitting on normal top of the waterfall-level. 
Last extra: the waterfall which is completely without water, the dry wall is in sight.The water seen comes from another part of the river. The building to the left stands on an island.