Hi there,
I'll be very appreciate if anyone can help me with this. I Have a small pool (10X4X4 ft), it's next to my house. Because I live on a hill, I want to setup a pump to circulate water from the pool to down the hill (it high about 9ft or so). My water supply is not really strong, anyway I donot know exactly the supply pressure. I also draw a picture as I "imagine" the system, but I'm not sure it'll work. Fisrt thing I wonder about is which type of pump shoud I have, and, secondly, how can I compensate the water in and water out, becase the water supply and water output from the pump are independent. I don't want the pool be full or even run out of water becase the pump does not pump the same amount with the supply.
Thank you so much for your help!
Here is my picture
http://i80.photobucket.com/albums/j1.../PoolSetup.jpg

I'm confused. "circulate" means circle. I don't see a "closed loop" here.

Are you trying to "dump" excess water at the rate it is filling say from a spring?

To size a pump you need to have some idea of the volume and pressure you need. If you just want to move the water down hill, you may not need to have much pressure, and the farther down hill you go, the more pressure you will have at the bottom. Go to Lowe's, HD, etc. and look at their sump pumps. If you put it up on something just below the lowest level you want the pond, the pump will shut off when the water gets down to that level. Water likely will continue to syphon through the pump after it shuts off, but only down to the pump intake.

You could accomplish the same thing by running a pipe through the side of the pond at the level you want. Either way will maintain the level of the pond at the height you want no matter how much or how little water is common in.

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Originally Posted by labman

To size a pump you need to have some idea of the volume and pressure you need. If you just want to move the water down hill, you may not need to have much pressure, and the farther down hill you go, the more pressure you will have at the bottom. Go to Lowes, HD, etc. and look at their sump pumps. If you put it up on something just below the lowest level you want the pond, the pump will shut off when the water gets down to that level. Water likely will continue to syphon through the pump after it shuts off, but only down to the pump intake.

You could accomplish the same thing by running a pipe through the side of the pond at the level you want. Either way will maintain the level of the pond at the height you want no matter how much or how little water is common in.

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Thank you for your fast respond, But I do not understand your idea, "put it up on something just below the lowest level you want the pond" and "accomplish the same thing by running a pipe through the side of the pond at the level you want". I really don't get that, could you please explain more clearly, and if you have some kind of picture I'll be likely more clear, consider it's kind of Stuff for dummies :)
Many thanks!!

Take a 5 gal bucket and put a 1/2" hole n it about 6" from the top. Put t under an outside spigot and vary the amount of water going into the bucket. The water will never be above the hole as long as the hole is the same size or bigger than the pipe feedng it.

Now attach a pipe or hose and make it infinately long to the hole and make it level or pitch it down and the water level still won't rise above the hole.

When water has to flow up at any point from the drain, a pump is necessary since gravity can't do the work.