If you make a small model of a river, what special rule helps you match the way waves and ripples move in the model to the real river?

The special rule that helps match the way waves and ripples move in a small model of a river to the real river is called Froude similarity, or Froude scaling. This rule requires that the Froude number of the model must be equal to the Froude number of the real river, which is known as the prototype. The Froude number is a dimensionless quantity that represents the ratio of inertial fo....