Warp schrieb:
>   For example, a farmer wants to build an irrigation system which takes some
> water from a nearby (large) river to his crops. Problem: The crops are 10
> meters higher than the surface of the river. How to lift the water to the
> crops?
...
 >   Can you figure out this clever solution?

Yup.

If the river flows fast enough, a whater-wheel can be (and often is) 
used, with some buckets attached in a smart way, using simple lever 
principles to use the running-water's power to lift the water up.

(A modern-times alternative, which can reach quite astonishing lifting 
heights even when just a small height difference is available in the 
water source, would be a hydraulic ram.)

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