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Re: Swales & Mudslides (fwd)
In a message dated 2/17/98 1:52:33 PM, sol3az@igc.apc.org wrote:
<<Great idea..
I have questions, though, based on my confessed ignorance of the issue!
What is the relationship between slope angle and the effectiveness of
swales? (Of course they become dams at the extreme end of the continuum).
Is there a confirmed relationship between slope and frequency/ spacing of
swales and the sheet water flow?
David Fuller.>>
In a message dated 2/17/98 1:52:33 PM, you wrote:
<<Great idea..
I have questions, though, based on my confessed ignorance of the issue!
What is the relationship between slope angle and the effectiveness of
swales? (Of course they become dams at the extreme end of the continuum).
Is there a confirmed relationship between slope and frequency/ spacing of
swales and the sheet water flow?
David Fuller.>>
this would also depend on soil type, rainfall (particularly extreme rainfall),
and vegetation type. In short, you have to figure it out from working on the
site, starting at the top and working down. The original land form with
original vegetation must have handled most of the runoff previous to
settlement by environmentally destructive peoples or the soil would be gone
already (except maybe in recent uplifts and volcanic mountains/islands).
For Mother Earth, Dan Hemenway, Yankee Permaculture Publications (since 1982),
Elfin Permaculture workshops, lectures, Permaculture Design Courses,
consulting and permaculture designs (since 1981), and now correspondence
courses via email. One is now underway. Advanced training in Paraguay this
August. Copyright, 1998, Dan & Cynthia Hemenway, P.O. Box 52, Sparr FL 32192
USA. Internships available. YankeePerm@aol.com
We don't have time to rush.
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