Civil Engineering PE

Answer: A - The heights considered when determining the hydrostatic pressure on cofferdams during various stages of construction are the maximum probable height of water outside the cofferdam and the height of the water inside the cofferdam. The height of water inside the cofferdam can change during construction, which will result in different hydrostatic pressures experienced by cofferdam while it is in use. Other significant forces experienced by cofferdams may include soil loads, water current, and wave action.