A concrete caisson 60 m wide, 120 m long, and 12 m high is to be towed in seawater in the longitudinal direction to an offshore construction site where it will be sunk. The calculated floating depth of the caisson is 8 m, with 4 m remaining above the water surface. A 1:100 model is built to study the operation of the prototype. If the model is towed in a wave tank using seawater, what is the model speed that corresponds to the prototype speed of 1.5 m/sec? The model study considers both the skin drag and form drag (Reynolds number) and the resistance resulting from the generation of gravity waves in motion (Froude number).