[SEL] O.T. O.T. Need Help On Water Flow Problem

[paulmaples at sbcglobal.net]

Thanks Bob.

I have been told that 1 gallon of water will cover 230 cubic inches to a 
dept of 1". I measured my water flow from the end of the hose coming from my 
water faucet and it is 5 gpm per minute. I know that my actual bed size is 
117.5" X 39.5" or 4641.3 cubic inches of soil surface. 1 gallon of water = 
230 ci so I divide my total soil surface of 4641.3 by 230 which = 20.1 
gallons of water needed to achieve a water penetration depth of 1" over my 
soil surface. Knowing that my flow rate is 5 GPM/minute I now divide the 
20.1 gallons needed by 5 gpm/min (actual flow rate) and find I would need to 
leave the water on for 4 minutes in order to achieve a 1" depth of water 
penetration over the bed area.

In order for this to work I will need to get an equal flow out of each of 
the dispensing holes or some parts of the bed will get more and some get 
less of the water. This is my problem, trying to achieve an equal amount of 
water out of each orifice.

Paul


----- Original Message ----- 
From: "Bob Willman" <blcksmth at wcnet.org>
To: "'The SEL email discussion list'" <sel at lists.stationary-engine.com>
Sent: Tuesday, June 02, 2009 10:21 PM
Subject: Re: [SEL] O.T. O.T. Need Help On Water Flow Problem


> I would think that very very small holes at the 16 locations so that
> the water flow from each is a very small percentage of the flow in the 
> main
> pipe so as to maintain constant pressure throughout the system. As it is 
> the
> pressure drops after each discharge hole. You could start with a larger
> diameter pipe up front and reduce the diameter after each opening which, I
> think, is the accepted method.
> If all the holes are already drilled and the system is level, I
> would try turning all the discharge holes to the top of the pipe and use a
> very slow flow rate in order to fill the entire pipe and let it slowly run
> out over the pipe to keep the flow rate slow but hopefully stabilize the
> pressure along the whole length.
>
>
> Bob Willman