Idea Tech

Do you have any creative ideas for the Tech Challenge?
The objective of this year's tech challenge is to create a device, powered by the river, to deliver water to the village's water tank. There is no electricity. Use the flow of the stream to generate power.
My teammates and I cannot think up of a creative, unique way to solve this challenge. Do you guys have any good ideas for this?
Thank you!
We were thinking about using a water wheel, but that doesn't sound very creative. We want to come up with an idea that no one else would have.
There is a lot of energy in a river flow. You need very little to raise a small amount to a tank. You might turn a wheel with big paddles (lots of force), then use a a gearbox to increase speed, decrease power, and connect it to a low pressure pump (like a garden pump) you might have something.
Fantasy Goes Wrong!
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