Just a quick test with ring saw... I will use a guide for bettter cut. I also have a diamond grinder to smooth edge after ringsaw.
Looks about right. Use lots of cooling to avoid overheating the glass and cracking it. Cut at a moderate pace but take breaks if you can to avoid overheating.
When. You say 0.25" weir height, you are referring to The water layer thickness over the weir, correct?