How to see whether a Chinese handmade teapot is well done or not - quality of the spout is an important standard. 

Laminar flow.

Late night laminar flow painting.

We have a chicken-and-egg situation in Fluid Mechanics. A deep question of which came first. A wavy morphology of the bottom of this very shallow stream would of course cause the surface of the water too to take on this wavy form. But, equally, it could be argued that the undulations of this flowing fluid could carve out the wavy bottom, in such an inextricably intertwined situation of cause exchanging places with consequence as to constitute a complex conceptual conundrum. A queer case of the sculptor exchanging roles with the sculpted.

Be that as it may, there is no dubitation regarding the elegance and beauty of this wavy water surface, it as perfect and pulchritudinous as a mathematical function translated into geometry.

Two other salient points  may be added to the above observation. Note the extraordinary surface detail of that wavy surface. Far from being smooth it is jam-packed with details, ridged and ribbed with complex longitudinal contours.

Furthermore, while that waveform is laminar, without breakage, it  was on occasion observed to break into spontaneous turbulence as seen in one of the photos, a turbulence that just as abruptly disappeared restoring the hitherto unbroken surface, as the photo after the turbulent foam photo shows. The turbulence may be interpreted  as a particular example of Le Chatelier’s Principle, namely that the system will react in a manner as to oppose a change, in this case the fast flow. It can also be interpreted as a type of inertia, that is a resistance to being put into motion.

The undulations gain their maximum magnitude just before the stream debouches out into the surf.