Very nice illustrations. I don't know if you are a teacher, but these are conceptually clear, easy to follow.
The Chimney Effect--one lesson, and I understand it. Not only that, it is a principle I can apply to other situations, besides streams and aquifers.
I look forward to your next installment.
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Many thanks, I am not a teacher but the time passed on the university books permised me to acquire a very schematic model
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