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A comment on Pre-Inca canal system uses hillsides as sponges to store water. Parent comment

Re:Pre-Inca canal system uses hillsides as sponges to store ... by ptah on Tuesday January 07, 2020 @06:08AM (#21978879)
yes, this is extensively taught in permaculture. it is based on pa yeoman's keyline design. not sure why this article thinks it's new
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