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Author Topic: Water pressure  (Read 1873 times)

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Offline Tom_Averwater

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Water pressure
« on: March 05, 2007, 08:27:06 PM »
I am wanting to water my watermelon and sweet corn patch this year using trickle irrigation. I can tap into the neighbors pond that is 500 feet away with approx. 80 feet of rise to the pond. The irrigation lines take 7 to 22 pounds of pressure to operate . I would like to use a piece of 1 inch plastic from the pond for the supply. Does anybody know of a formula for figuring out  water pressure per foot of rise ? Thanks Tom
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Offline Ianab

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Re: Water pressure
« Reply #1 on: March 05, 2007, 09:18:39 PM »
Feet head (of water) x .433 = Pounds per square inch (PSI)

80 x .433 = 34.6 psi

So you prolly want to be pumping at about 50psi ? 1" pipe should be fine as long as you dont need a high flow rate.

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Offline wiam

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Re: Water pressure
« Reply #2 on: March 05, 2007, 09:45:49 PM »
There is also going to be some friction loss in the pipe, but I can not find my table for that right now.

Will

Offline Qweaver

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Re: Water pressure
« Reply #3 on: March 05, 2007, 10:37:56 PM »
This is a little confusing to me.  Is the pond above the field that you want to water?  If so, you should be good to go and in fact may need to regulate.
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Offline Tom_Averwater

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Re: Water pressure
« Reply #4 on: March 06, 2007, 05:47:33 AM »

the pond sits on a hill above the field I want to irrigate .  Thanks for the replies. Tom
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Offline Faron

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Re: Water pressure
« Reply #5 on: March 06, 2007, 05:55:06 AM »
Are you setting up a siphon line, then?  That ought to work fine.
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Online Dana

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Re: Water pressure
« Reply #6 on: March 06, 2007, 06:01:08 AM »
Tom here is the flow rates for plastic pipe. Since you mention trickle watering, flow isn't that big of a deal. All gallons per minute are for your spec/distance of 500 feet.

1/2" - 2 gpm
3/4" - 5 gpm
1"    - 8 gpm
1 1/4" - 19 gpm
1 1/2 "- 26 gpm
 2" - 50 gpm
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Offline Tom_Averwater

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Re: Water pressure
« Reply #7 on: March 06, 2007, 06:02:23 AM »
The neighbor has a pipe running out of the bottom of the dam. He used to water his cattle with it .
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Offline Tom_Averwater

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Re: Water pressure
« Reply #8 on: March 06, 2007, 06:04:53 AM »
dana ,is that for no pressure in the line , just flow ?
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Online Dana

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Re: Water pressure
« Reply #9 on: March 06, 2007, 06:17:52 AM »
Tom, that is the total flow that  size pipe can carry per minute, (max. flow)

Also you will want to consider the fact the pipe comes out of the bottom of the dam. The pressure  of the water above the pipe in the dam should be taken into account. As was said above, you may need to regulate the p.s.i down.
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Offline snowman

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Re: Water pressure
« Reply #10 on: March 06, 2007, 09:21:16 AM »
This is a subject near and dear to me since my new home will have hydro power.Easy way to figure psi is ,2.3 feet of drop=1psi.You mentioned sucking water from bottim of a cow pond, I forsee huge problem with trickle irrigation due to sediment in bottom of pond.Ive been sucking from a clean stream hooked up to my camper where i spent all last summer logging and milling on my future home site and had to clean the screen the hose hooks into every other day or so.Kinda off the subject but ive been using this water to wash my logs, 70psi, 10 gallons per minute, works great,all but debarks them for me :)

Offline Faron

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Re: Water pressure
« Reply #11 on: March 07, 2007, 07:14:07 AM »
I think the setup Tom is talking about doesn't actually pull off the very bottom of the pond.  The pipe goes through the dam and has an intake a few feet off the bottom.  Usually the cattle don't have access to the pond itself, so it stays clean.  I am working on a similiar setup on a farm I just rented. 
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Offline scgargoyle

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Re: Water pressure
« Reply #12 on: March 07, 2007, 05:54:54 PM »
Everyone on our pond draws water for the lawn. I have a perforated PVC well point on the end of the suction pipe, and a float tied to the end of it to keep it out of the muck.
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Offline Tom_Averwater

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Re: Water pressure
« Reply #13 on: March 07, 2007, 09:39:43 PM »
Faron is right about the pond. The cows ,when he has them ,are fenced out of the pond. Y'all have been a big help on this. Now if it does'nt rain I can get some plowing done . Tom
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