I've seen more as-built detention pond surveys with the word spelled "Oriface" than orifice.
Face? Really? Ori Face? It calls visions of some sort of Alice in Wonderland hole where a cheshire cat is staring out at me, gobbling up my stormwater with creepy eyes. Accusingly.
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com