Permaculture instructor Andrew Millison explains the landscape profile zones of the Keyline® farm design system.
The four zones within the landscape profile are:
1) Water Catchment Zone
2) Water Retention Zone
3) Irrigation Zone
4) Reconstitution Zone
When this system is applied to the landscape, the whole ecosystem and biosphere are benefitted, along with enduring high farm yields.

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https://permaculturedesign.oregonstate.edu/

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