increases with discharge in the downstream direction, but in Basin B, depth changes very little
in the downstream direction. Leopold and Maddock (1953) show that the type of relations
illustrated in Figure 5.20 exist in natural rivers.
Figure 5.19. Variation of discharge at a given river cross section and at points downstream
(after Leopold and Maddock 1953). At-a-station relations pertain to individual
sites such as A or B. Downstream relations pertain to a channel (segment A-B)
Figure 5.20. Schematic variation of width, depth, and velocity with at-a-station and downstream
discharge variation (after Leopold and Maddock 1953).