1- A 1:2000 scale tidal model is operated to satisfy Froude’s law. A velocity of 0.02 ft/s is observed in the model. What is the velocity at the corresponding point in the prototype? What length of time in the model corresponds to one day in the prototype?
2- An overflow spillway 1,600 feet long is designed to pass 120,000 ft3/s of water. A 1:20 scale model of the cross section of the structure is built in the laboratory. It is assumed that the flow is two dimensional so only a 1-foot section (rather than the 80-feet section) is built. Calculate the required laboratory flow rate for the 1-ft section assuming that the viscosity and surface tension can be neglected. The pressure at a point in the model is observed to be -1.0 psi. What would be the pressure at this point in the prototype? What is the interpretation of this kind of pressure in the prototype?