I think I will challenge my son to design a set up to help move/filter duck pond water. He is a math science major, and competes using solar and robots at his Jr/sr high school. He built me a solar powered heat lamp recently, wants to solar power a gate opener with remote so if he is helping haul things to the coop he can open and close the gate to the run on his own.
Since he likes challenges and is building a filter system to remove salt from water right now he might find this problem fun to work with. Oh and he is turning 13 this summer (love my young genius)