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  #1  
Old 06-11-2004, 02:45 PM
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Lombardi Lombardi is offline
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Pump size

What size pump would you recommend for this potential waterfall? They will be getting the water from the lake directly below. It is approximately 35' down to water and on a very steep slope.
Any suggestions on the construction of the waterfall would be helpful also. Thanks in advance.
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  #2  
Old 06-27-2004, 01:40 PM
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The Lawn Boy Pro The Lawn Boy Pro is offline
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something that pumps at LEAST 5000 GPH.
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Old 06-28-2004, 07:03 AM
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Victor Victor is offline
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Hello Dave

That's a really good site to build a waterfall on. I'm sure it will look great when you're done with it. I just read your question and figured I'd try to help.

Let's talk waterfalls....... The sheet of water that flows over a waterfall is called a "weir." There are calculations that will let you determine how many gallons per minute of flow will be required to get a weir of a certain width and thickness. For example, if you had a waterfall weir that was let's say 6" to 11" wide, to have enough flow to make that weir 1" thick, you'd need to have 3300 gallons per minute of flow through that waterfall opening. If you had an opening of let's say 12" to 15" and you wanted your weir to be 1" thick, you'd need to have 4500 GPM of flow to acheive it. There are charts in pond building books (one of mine has one, but that won't do you any good) that lay out how much flow you'll need to achieve a weir of certain thickness given a particular width. Here's the web address of a chart you can look at for weir size calculations. >>
http://www.aquaart.com/pondcalc.html

Here's a rough guide that will get you started. This will at least give you an idea of what you'll need as far as pump capacity.
Waterfall Weir Rates


Width of Weir Thickness of Water


(GPH/GPM per ft) Smooth Weir Stone/rough Weir


360/6 1/4" 3/16"


600/10 3/8" 5/16"


900/15 1/2" 3/8"


1,680/28 3/4" 9/16"


2,400/40 1" 3/4"


4,500/75 1.5" 1.25"


6,720/112 2" 1.75"

Once you figure out how much flow you're going to need to get your weir looking the way you want it to, simply select a high head pump (one that's made to elevate water great distances) that's rated to flow the amount of water that you want to move.

Vic
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Old 06-30-2004, 10:16 PM
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WeatherMan WeatherMan is offline
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Very good answear victor, you just keep amazing me with your knowledge
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  #5  
Old 06-30-2004, 10:26 PM
Ground Master Ground Master is offline
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Victor- you mean 3300 gph and not gpm, right?
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  #6  
Old 07-03-2004, 10:54 AM
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Victor Victor is offline
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That's right....GPH........sorry about that.

Vic
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Old 07-03-2004, 10:56 AM
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Victor Victor is offline
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Thanks Weatherman. I still have a lot to learn though.

Vic
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