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Posted by Ron Rosenfeld on February 9, 2009, 10:03 pm
On Sun, 08 Feb 2009 20:19:08 -0600, david.williams@bayman.org (David
Williams) wrote:

Well, the little bit of research I've done suggests that micro-hydro will
be maybe 53% efficient.

If you also have to supply electricity to fill the upper pond, you'll lose
some more in that transition.

Posted by wmbjkREMOVE on February 10, 2009, 1:39 pm
On Mon, 09 Feb 2009 17:03:50 -0500, Ron Rosenfeld

And don't forget to account for evaporation. Recently I estimated the
energy needs of filling a pond from a 400' well. Based on the owner's
observations of evaporation rates, I found that he needed to supply an
average of 50,000 gallons per day just to keep up. He'd hoped that a
solar pump could do that part of the job. Turned out he'd need 20 of


Posted by Ron Rosenfeld on February 10, 2009, 6:41 pm
 On Tue, 10 Feb 2009 06:39:46 -0700, wmbjkREMOVE@citlink.net wrote:

Good point.  I guess that rate varies with temperature and wind speed.  How
big a pond were you dealing with?

Posted by wmbjkREMOVE on February 11, 2009, 11:18 pm
 On Tue, 10 Feb 2009 13:41:02 -0500, Ron Rosenfeld

1 acre existing pond with a proposed tripling of size. General
evaporation rates here
http://www.grow.arizona.edu/Grow--GrowResources.php?ResourceId  8 and
http://www.ocs.orst.edu/page_links/comparative_climate/arizona/arizona.html ,
but owner's tests and observations proved a higher rate than expected
due to wind. His place is in the valley off the right side of this pic
http://www.citlink.net/~wmbjk/images/snowman.JPG .  :-)


Posted by Ron Rosenfeld on February 12, 2009, 2:08 am
 On Wed, 11 Feb 2009 16:18:18 -0700, wmbjkREMOVE@citlink.net wrote:

Ah, very large.  Thanks for the links.

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