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homebrew hydro update: coanda water intake

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Posted by z on February 21, 2009, 4:57 am
I finally built a weir in that little stream and got the coanda screen
installed .. its still in testing.  It is amazing how much water flows
through those 1 mm gaps.  Water is still very low .. crazy winter.. snow
and cold but very little rain.  Normally i'd be swimming up there but its
only as much water as you'd expect in the first part of fall or late

So i'm waiting for the big rains to test it .. but not too big .. ain't
asking for a flood :)

here's the pics n stuff i've been doing.  Had a few beers up there today so
i'll have to proofreed tomorrow heh.  Still using the old intake till I get
this set in.. need a few more fittings to get her going where I want before
I glue it all together.  


upshot is the screen looks like it will do the job -- the real test is
coming with the rains -- unless Al Gore is right and my rain forrest turns
into a desert.



Posted by Bob F on February 21, 2009, 5:22 am
z wrote:

That barrel is perfect for the collector. Good job.

How stiff is the screen? Is it strong enough to not need a support in the middle
when loaded down with more water than the pipe can carry?

Posted by z on February 21, 2009, 6:12 am

its plenty stiff.  I'm guessing (without going up the hill and measuring
in the cold of night) that the backing are 1/4th inch (maybe more)
stainless round bar welded to the horrizontal wedge wires -- i'd take
some effor to bend that thing for sure.

It might need support .. i dono.. i'm more worried about the force of
water getting under the barrel and carrying it down stream when the shit
gets going.  Its damn hard to deal with the real rains.. that little
stream will get another 2 feet of water within a few hours when the shit
hits hard.

we'll see!  



Posted by z on February 22, 2009, 6:44 pm

I've been thinking along the same lines, but I think as long as the weir
does its job like I want than it should just wash right over in high
water and allow it to fill in very low water.

I have a six inch pipe up there and I was screwing around with the idea
of using that to feed the pipe, but the downside to that is the low water

We'll see -- thanks for the advice !

Posted by daestrom on February 21, 2009, 6:23 pm
 z wrote:

That's pretty awesome there Z.  I can see that the angle of the screen
allows the debris to just roll/flow right off out of the way.  Is there any
water that doesn't fall through the screen into the collection?

Guess the only thing you might have to do is go up there once in awhile and
clear the piles of debris away from the screen.

Thanks for sharing.


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