ABSTRACT
Owing to the complexities associated with the flow phenomenon, a precise mathematical analysis is only possible in a few, and from the civil engineering point of view, somewhat impractical, cases. It is there fore necessary to solve flow problems either by experimentation or by making certain simplifying assumptions sufficient to facilitate a theo retical solution. The two approaches are not mutually exclusive, since the fundamental laws of mechanics are always valid and enable partially theoretical methods to be adopted in several important cases. Also, it is important to ascertain experimentally the extent of the deviation from the true conditions consequent upon a simplified analysis.
