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[–] StuffThatSandwich 0 points 12 points (+12|-0) ago 

The opening is placed facing the same direction as the wind typically travels (apparently some wind towers can change which side is opened too), this sucks air out the top, which in turn sucks air through the hole in the ground.

https://en.wikipedia.org/wiki/Windcatcher#Function

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[–] Thissandwich 0 points 2 points (+2|-0) ago 

Okay. I see the water canal now. That makes more sense.