This question arises due to a problem I'd been solving recently:
The question was to find the average power supplied by the water over the six hour period.
Now I have read this post which distinguishes the average power from instantaneous power. What I found was that one averages power when there is some sort of "repetition" or that the power is varying with a time period. In this case, the water level is varying, so the depth of the water is varying with time. How should I further proceed with this insight?