🧊 Glacier Moulin: Pond Drainage, Torricelli Outlet and Water Balance (2D cross-section)

Cross-section of a glacier surface pond draining through a weir into a vertical moulin and out to the bed. Set rain, temperature, catchment, pond and shaft size and outlet blockage, and watch runoff, shaft head, overflow and the mass balance. Same engine file as the 3D page, with four in-page numerical checks.