According to the GW Hatchet, a student newspaper for George Washington University:
"...There are no regulation dimensions for water polo pools according to FINA, the international governing body for aquatic sports, but most NCAA pools are 30 by 20 meters and sufficiently deep to prevent standing. The pool under in Smith Center is only 25 yards, or 22.86 meters, across and only 4.5-feet deep in the shallow end. ..." [Link]
Who is the genius that thought those dimensions up?