How much height do you need for gravity return to a pond?


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Your basic plumber's rules of thumb would apply, wouldn't it. Under 2 1/2 inches in diameter - 1/4 inch per foot. 3 to 6 inches in diameter - 1/8 inch per foot.
 
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Well, in my mind if you have a pump on one end... oh wait. You said "gravity". Not only are my math skills bad, my reading skills need work, too!
 
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1/8 inch per foot is the basic pitch for drain lines that way the water doesn't run out of the pipe leaving any solids behind but I believe you'll have a constant flow of water so there realy isn't a degree of pitch.
 

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1/8 inch per foot is the basic pitch for drain lines that way the water doesn't run out of the pipe leaving any solids behind but I believe you'll have a constant flow of water so there realy isn't a degree of pitch.
Good to know! One option I have considered is to use large Rubbermaid stock tanks for the bog(s) as opposed to excavating and using a liner. I am still using my original Skippy (no judgement, it works for me has been going strong for 10 years — OMG, has it been that long?) to filter the goldfish pond/pool, and I am very accustomed to the way it’s plumbed as well as its idiosyncrasies. I have a 300 gal tank that used to be for QT back at the old place, and I think it might work as a turtle-bog. Whenever completed, the edge of the Pond and water level will be slightly above ground level (high water table), so need to be sure I can account for a good gravity return.
 
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Just about any pitch will work. With gravity flow returns, the real thing to look for is flow rate. Need to know what you need to flow and then choose pipe size appropriately. Need bigger pipes for gravity than for pump.
 

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