Answer: Given are identical-height dips in two different rivers. There is a waterfall in this section of river A. There is a hydroelectric dam on this section of river B. The potential energy of the water is now transformed into kinetic energy as it falls, with the kinetic energy peaking at the waterfall's base.
Therefore, river A would have greater water kinetic energy than river B at the bottom of the descent. Similar to how, because the river's velocity is zero at that point, the top of the drop in river A has less kinetic energy than the top of the drop in river B