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Tool Talk Discussion Forum

water conversions

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Doug

03-05-2004 08:14:49




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Pumps are rated at gallons per minute or hour. Ponds are rated at acre feet (one acre of water, one foot deep is one acre foot or roughly 43 thousand square feet) I'm trying to figure out how many square feet of water a pump can pump at a given gallon/minute rating. Can anyone help me with this conversion?




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John

03-08-2004 23:24:44




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 Re: water conversions in reply to Doug, 03-05-2004 08:14:49  
"I'm trying to figure out how many square feet of water a pump can pump at a given gallon/minute rating. Can anyone help me with this conversion?"

After you plug your pump in, you will probably discover that it doesn't work. the problem is that it is a 3 dimensional pump. 3D pumps pump cubic feet of water. If you want to pump square feet, you need a two dimensional pump. it is a flat pump that can has the ability to remove volume from something that has no volume. it kind of looks like a sheet of paper with a hose and cord coming from the top. you're in luck, because i happen to have a used one sitting right here and you can have it for the bargain price of $1599.99

anyways, the other people are right about there being 7.5 gallons per CUBIC foot of water. but you can still call me if you are interested in the two dimensional pump that pumps square feet. :)

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Hydro-engineer

03-06-2004 07:52:04




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 Re: water conversions in reply to Doug, 03-05-2004 08:14:49  
One acre is equal to 43,560 sq. feet (assume you have one acre one foot deep is equal to 43,560 cubic feet of water (7.5 gallons of water to a cubic foot) I dont have a calculator handy but that would be more than 300,000 gallons of water and if you had a 100GPM pump then it would take 3000 hours to pump out a pond this size. Or you could hire a contrator to pump it out for you with a much larger pump.

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Joe (Wa)

03-06-2004 10:42:54




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 Re: Re: water conversions in reply to Hydro-engineer, 03-06-2004 07:52:04  
Wow, 3000 hrs with a 100 gpm pump. Got your hours & minutes mixed up? Joe



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Heat Houser

03-05-2004 18:35:46




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 Re: water conversions in reply to Doug, 03-05-2004 08:14:49  
There are 7.4805194 gallons in one cubic foot.
Take your pump rating in gallons per minute divided by the number above and you will get cubic feet per minute. If your pump is rated in gallons per hour, your result will be in cubic feet per hour.
Just for information, water weighs right at 62 lbs per cubic foot.



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JOHN (LA)

03-05-2004 13:16:10




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 Re: water conversions in reply to Doug, 03-05-2004 08:14:49  
Doug;
Per the LSU Ag Center there is 27,154 gallons of water per acre INCH.
27,164 x 12 = 325,968 gallons per acre foot.

Go to the LA; MS; AR; ALA; Ag sites and search for catfish ponds or farm ponds. These are all big catfish farm states and the ag center has many publications on ponds. By searching these publications you can find anything you need to know about ponds such as evaporation rate, well size and pump size to replace this water ect..... ...

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JOHN (LA)

03-05-2004 13:23:08




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 Re: Re: water conversions in reply to JOHN (LA), 03-05-2004 13:16:10  
Excuse my adding or transfer of figures

27,154 x 12 = 325,848 gallons per acre foot



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T_Bone

03-05-2004 09:36:37




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 Re: water conversions in reply to Doug, 03-05-2004 08:14:49  
Hi Doug,

I like working in inchs.

1000gpm= 231 (ci in a gallon) X 1000 = 231000ci / 144 (ci in a sq/ft, 12"x12"x1"=144")= 1604sq/ft 1" deep.

4" of water then would cover (1604/4) = 401sq/ft

T_Bone



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Rod (NH)

03-05-2004 08:56:53




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 Re: water conversions in reply to Doug, 03-05-2004 08:14:49  
Hi Doug,

I think you mean cubic feet instead of square feet. That is, 43,560 cubic feet per acre-foot. There are 7.48 gal per cubic foot. Therefore, an acre foot has a volume of about 325,830 gallons. For a pump delivering 1000 gal/min, it would take 326 min to pump 1 acre-foot

third party image Rod

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Roughly

03-05-2004 08:43:45




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 Re: water conversions in reply to Doug, 03-05-2004 08:14:49  
8 gals of water = 1 cubic foot.



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Bob

03-05-2004 11:43:29




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 Re: Re: water conversions in reply to Roughly, 03-05-2004 08:43:45  
8 gallons is a very rough figure for a cubic foot actual is less than 7.5



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