Caverdale wrote:I think you wrote that incorrectly and really meant the steep side is on the upstream side and faces downstream. Referring to the diagram, the steep side is directly below the circle with the "1" inside and the tail end of the arrow pointing right or downstream. I am puzzled by Sweeting's explanation which seems backwards from the rest.
I definitely didn't write that incorrectly!
I'd scan Curl's diagram if I had a scanner, but...
The vector 'd' shows the water flow direction. Upstream is to the left, downstream, where the arrow is pointing, is to the right. The scallop crest, underneath the number 1 in a circle, clearly shows the steepest angle on the right, or downstream, side.
Art Palmer's diagram is even simpler and more clear. While I'm no geologist, I just spent all of last week studying under Art at Mammoth Cave, and we spent a great deal of time examining scallops to determine paleo-flow patterns.