A river is more than water. There’s water in a lake, too. The essence of the river is the current. Paddling upstream is more difficult than going downstream. A snapshot shows you the water, but not its motion, not the relentless force as the water moves from here to there. The river flows. If you want to change the course of a river, you can try to build a dam, but those are expensive and can fail. The alternative is to dig a small channel that helps a river to go where it was going anyway. When you make it easier for the current to flow, the current will respond. A small channel quickly
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