Of Dust and Light

Head Loss

Canal surface seen from above: a brick bed visible through running water, green algae drawn out by the current.
Concrete arch where the Glatt enters the Rhine; the arches of a barrage in the background to the left.
Close view of a water wheel: water falling from a metal flume onto the blades.
Weir crest seen from above: smooth water passing over the edge and breaking into foam.