Are Extremal Hypotheses not consistent with alluvial regime channels ?

The paper deals with the "Minimum Stream Power" and "Maximum Sediment Transport" theories that are used to explain the "equilibrium configuration" of both rivers and earthen channels. The approach proposed is based on the utilization of six different relationships existing among the seven variables involved in the problem (i.e., the bottom and surface widths, the hydraulic depth. the mean diameter of sediment existing at river bed and transported by flow, the water and sediment discharges coming from the basin and carried by the reach, and the dynamic equilibrium longitudinal slope), and a "closure" condition given by "Minimum Stream Power" or "Maximum Sediment Transport" theories. The suitability of the approach is tested by using a number of experimental results taken from the literature.