🌊 Tidal Basin and Harbour Opening: Torricelli Discharge and Tidal Lag (2D)

Side view of a harbour wall with an opening between the sea and a basin while the tide rises and falls. Set the tide amplitude and period, the basin area and the opening width, height and discharge coefficient, and watch the flood and ebb flows, the head across the opening, the lag of the basin behind the sea and the hydraulic power. The stepped model is checked against Torricelli, the drain-down time, the volume balance and the wide-open limit, with four in-page numerical checks.