Hello all, trying to figure this out. I work at a shipyard and operate/maintain the drydock. The discharge tunnel that flows water out into the ocean has culverts about 24.5' x 15.5' x 8'. Connected to the bottom of the culvert is a 48" pipe that goes to a gate valve of the same diameter. If I were to drain a culvert full of sea water into a lower chamber, what would be the flow rate (in GPM) if the valve were @ 100% open and @ 10% open? Thanks for looking!