A river has been channelized such that it is straight and rectangular in section. The width is $10$ m$,$ the channel gradient is $0\mathrm{.}001,$ and Manning$$s n is $0\mathrm{.}03.$ The bankfull flow is Q$=30$ m$3/$s$.$ Bankfull means that the flow depth is just at the top of the channel bank. If greater depth is required then flooding occurs because flow spills onto the floodplain. A local fisheries group has convinced the City to improve fish habitat in the river. You have been asked to design rock riffles $($channel$-$spanning$)$ humps$)$ to be installed in the creek to increase the variability of depth and velocity in the river, which will provide a greater variety of habitats for aquatic biota.

determine the maximum size $($vertical dimension$)$

Show your solution on a specific energy plot.