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Old 03-11-2010, 09:57 AM
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Niagara Falls Niagara Falls is offline
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Water flow

I am not 100% sure of the type and size of pump I want for my water fall project, but is there one which has a flow control built in. I am looking at about 12,000gph, but that might be too much based on the various methods of formulation I've seen.
And that's another area of concern. I have no less than 3 different formulas for the required GPH, that range from 5,500 up to 20,000. All arived at from the same input data.

Sure not an exact science is it.
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Old 03-11-2010, 12:45 PM
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tadpole tadpole is offline
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On the contrary, it is an exact science if you use the correct method of determining pump size. If you know the waterfall weir width, the desired flow depth, the height of waterfall weir from pond surface, length of piping, size of piping, and the number of elbows, tees, etc.(if you are using rigid PVC), you can pretty accurately determine the size (GPM or GPH rating) of the pump required. More simply put, you must determine total HEAD. Then you find a pump that will give you the flow you want at that HEAD.
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Old 03-12-2010, 02:35 PM
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Niagara Falls Niagara Falls is offline
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That's where I'm probably getting different answers, because of all the extra data I really don't know 100%. I don't know how many elbows or tees I'm going to require until I actually get to the drawings.....if you can call them that. What I have is a picture of where I want the waterfall & pond with rough pencil sketching.
I guess the best and only way is to measure it all and then re-calculate my pump needs. And that will give me my exact HEAD ??

As you are aware, I'm not a pro, just very determined to do it myself.
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Old 03-12-2010, 03:05 PM
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tadpole tadpole is offline
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Looking back over your previous posts, I would recommend using 3" Flex PVC. This will reduce pipe friction loss and completely eliminate any loss from fittings, plus it is easier to install. It is a little pricey but worth the extra costs. There are several Head calculators available for free on the Web. Hint: Use the simplest one, you are not plumbing a high rise.
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Old 03-12-2010, 04:24 PM
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STL Ponds and Waterfalls STL Ponds and Waterfalls is offline
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To add to what Tadpole said. Your better off using flex pvc in your climate, it will withstand freezing a lot better than rigid pvc. If any water gets trapped in the pipe and freezes it will not break like rigid will. 3" flex is pretty big so take that in to account when planning. It's roughly 4.5" OD.
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Old 03-12-2010, 04:57 PM
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I keep forgetting temps. St. Louis is correct. Flex PVC is some tough stuff, tried to cut it with an axe one time just to see how tough. Almost sprained both wrists with the recoil and only put a scratch in the Flex. You are in Hort zone 4b and I am in zone 8b, that's forty degrees F difference. Need to rethink several things in your temps, like how does silicon caulk and waterfall foam react to extended freezing?
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Old 03-12-2010, 05:30 PM
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alf500series alf500series is offline
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do you know how much pipe you will need? i just did a fountain last fall and have 25' of flexible 3" pvc pipe that id be willing to sell.
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Old 03-15-2010, 11:21 AM
pitrack pitrack is offline
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Quote:
Originally Posted by alf500series View Post
do you know how much pipe you will need? i just did a fountain last fall and have 25' of flexible 3" pvc pipe that id be willing to sell.
He lives in Canada, I doubt it would be worth shipping that pipe all the way there.
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Old 03-15-2010, 12:08 PM
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alf500series alf500series is offline
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you might look into pondusa.com i believe their warehouse is in quebec. thats where i got my pump and flexible tubing
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Old 03-15-2010, 05:51 PM
JJE JJE is offline
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LMAO .... pondusa.

Warehouse in Canada

Gotta love the way things done today
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