1 To check the reasonableness of this computation, the estimated discharges at the Brownsville Ship Channel site were compared with discharges measured at the same site by an ADCP during June 6–7, 1997. The estimated discharges for the survey period ranged from -17,500 to 34,700 cubic feet per second. (Flood tide flows were considered positive discharges, and ebb tide flows were considered negative discharges.) The June 6–7 ADCP discharges ranged from -17,400 to 22,200 cubic feet per second. This comparison shows that the estimated discharges are of the same order of magnitude as the discharges measured on June 6–7. Also, because the 74-hour survey period coincided with the period of annual maximum tidal fluctuation, discharges would be expected to have been greater during the survey than during June 6–7. Therefore, the authors believe the estimated discharges for Brownsville Ship Channel are reasonable, although the assumption of negligible storage was not verified.