Curved Weirs
From ASDSO Dam Safety Toolbox
Many agencies provide design information for Ogee *weirs. IN PROGRESS
https://www.usbr.gov/tsc/techreferences/mands/mands-pdfs/SmallDams.pdf
https://www.hec.usace.army.mil/confluence/hmsdocs/hmstrm/modeling-reservoirs/spillways
https://www.usbr.gov/tsc/techreferences/hydraulics_lab/pubs/PAP/PAP-0609.pdf