  Extending work of Yang-Zumbrun for the hydrodynamically stable case of Froude
number F < 2, we categorize completely the existence and convective stability
of hydraulic shock profiles of the Saint Venant equations of inclined thin-film
flow. Moreover, we confirm by numerical experiment that asymptotic dynamics for
general Riemann data is given in the hydrodynamic instability regime by either
stable hydraulic shock waves, or a pattern consisting of an invading roll wave
front separated by a finite terminating Lax shock from a constant state at plus
infinity. Notably, profiles, and existence and stability diagrams are all
rigorously obtained by mathematical analysis and explicit calculation.
