Some newer engines also have flow-rate monitors for the discharges, these show the rate of water flowing in GallonsperMinute (GPM) instead of raw pressure.
The rate going in was 900 gallonsperminute, but the flow data of mud coming out was steadily increasing from 900 gallons a minute at 8:20 p.m. to a rate of 1, 200 gallonsperminute at 8:34 p.m.