$-$Problem $6\mathrm{.}6$

From the Rhine River data in Case Study $6\mathrm{.}1,$ estimate the flood$-$wave celerity of the $1998$ flood. A flood wave in the same reach is shown in Figure P$6\mathrm{.}6$ from a dam break on the M$$hne River in Germany. Comment on whether the wave is amplified or attenuated, and roughly estimate the flood$-$wave celerity.