Spa Spillover not flowing right

[jsorrels]

Moved from here.
@Pool Clown

The leading edge of the waterfall must have a straight or sharp edge to sheet or keep from hugging the wall. If you want a diffused or "rough" cascade, then you would make the leading edge rounded, and cut a groove on the underside to keep the water off the wall (as stated above).

What is the difference between a sheet and a cascade? I just had my pool renovated and am experiencing the wall hugging spillover. If I disrupt the 20" wide flow momentarily it will begin to sheet temporarily. The new granite does have a rounded edge. Trying to determine if I should cut the under groove or sharpen the leading edge with my grinder (or both).

 

[markayash]

My old one had a rounded edge and I had to put tile on the ends to give it a straight drop