🏛️ Underground Columned Cistern: Hydrostatic Wall Load, Column Buoyancy and Draining (2D long section)

Long section of a vaulted underground cistern with 336 columns. Set the water depth and density from the 3D page, plus wall thickness, outlet size and inflow, and see the stored volume, pressure on the wall, wall overturning margin, buoyancy on the columns and the draining time. Four in-page numerical checks.