🌊 Polder Drainage: Tidal Sluice Window, Pump Station and Storm Level (2D)

Cross-section of a low-lying polder behind a sea dike, drained through a sluice gate that can open only while the tide is lower than the polder, with a pump station that takes over when the water rises. Set the polder area, the rainfall of a 24 hour storm, the sluice width, the tidal range, the pump capacity and the starting level, and see the polder level over 48 hours, the hours the sluice is open, the pumped volume, the pump energy and the hours above the flood level. The water balance, the emptying law of the sluice, the length of the sluice window and the time-step convergence are checked numerically, with four in-page numerical checks.