text: The flow area of each caisson should be maximised. This can be achieved by:
  * Ensuring the greatest possible distance between the caisson walls, with steel diagonals providing sufficient torsional stiffness.
  * Designing the bottom of the caissons to be as thin as possible.
  * Incorporating ballast spaces within the superstructure of the caisson to add necessary weight, thereby generating sufficient friction between the caisson and the sill.