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

[Keith Kinney]

Paul
Your 5 gpm I assume is from an unrestricted hose.  As soon as you  
restrict the flow won't your gpm decrease thus voiding your  
calculations?
Keith

On Jun 3, 2009, at 10:28 AM, <paulmaples at sbcglobal.net> <paulmaples at sbcglobal.net 
 > wrote:

> 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
>
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Keith Kinney
kkinney at herculesengines.com
WWW.HerculesEngines.com