River regime

River regime can describe one of two characteristics of a reach of an alluvial river: River regime can describe one of two characteristics of a reach of an alluvial river: The latter is described by the fact that the discharge through a river of an approximate rectangular cross-section must, through conservation of mass, equal where Q {displaystyle Q} is the volumetric discharge, u ¯ {displaystyle {ar {u}}} is the mean flow velocity, b {displaystyle b} is the channel width (breadth) and h {displaystyle h} is the channel depth.