Shape effects on resistance to flow in smooth rectangular channels

A method for dealing with the effects of cross sectional shape on flow resistance in open channels was developed and presented in a previous paper. The new method, which was referred to as kazemipour's method, was tested against the experimental data of other investigators available at the time when it was developed and published. To test further the effectiveness and generality, of kazemipour's method, a series of experiments with smooth and rough rectangular and also with smooth and rough semi circular channels was designed and the first experiments in this series, those in smooth rectangular channels, are described in this paper. The results of these experiments have verified further the effectiveness and generality of kazemipour's method in smooth rectangular channels. In particular, the effectiveness of the psi curve, which was originally derived from independent experimental data, was confirmed when applied to the present data. In addition to the usefulness of these experiments in the study of shape effects, they provide a new set of valuable data about open channel resistance (a).