Further observations of turbulence in Staveley

I also noticed laminar and turbulent flow on the mill weir at Wilf's cafe in Staveley. The water coming down the duct on the left is quite turbulent but then it emerges onto a wide flagstone. The water in that section is crystal clear suggesting smooth flow over a plate. As it drops over the edge it immediately becomes turbulent. Perhaps the plate forces smooth flow whereas as soon as it drops it can flow anywhere.