Pond Guy

If I have a 5000 GPH pump and 20 feet of 2 inch pipe collecting water from a pond at 6 feet deep don't I need to drill varying sizes of holes in that pipe to draw the water evenly thru each hole?

Thank You for the Suggestions

Oh, now I get it.

Single horizontal pipe at 6' depth, suction at one end.

Yes, probably is some formula, but it isn't in this brain. I'll have to look at that.

Maybe some of the larger brains here can give you some help.

Still not sure that a single opening at the lowest point won't work as well. Depend on the gradiant of the water and what you are trying to filter.

My pool pump sucks from the lowest point and the skimmer equally.

thank you

I don't know anything about gravel filters, but if you can describe (or give a link to) what you want to do, someone can probably help. But I can tell you 5000 GPH (80+ GPM) is too much for a 2" pipe.

I am assuming that you meant 500 GPH. At 5000 GPH your pipe would probably collapse.

Multiple holes in the pipe for suction will minimize the disturbance of pond sediment. I assume that is why you are doing this.

Drill 64 holes of 1/4" at regular intervals along and around the pipe, and cap the end. The combined area of these holes will match the 2" outlet in terms of area. Each hole will take in 0.13 GPM, which should be adequately reduced velocity.

I'd go down to 64, 3/16" dia. holes so the tube will act as a plunum and distribute the suction over the entire distance.

Assuming that 6 foot depth of the pipe is not too close to the bottom of the pond.

You are right that suction will be more evenly distributed, but velocity will be increased.

Velocity through the holes, OK, but velocity inside the horizontal and riser section? Turbulance will be settled as the stream makes the turn at the elbow and traverses up the verticle pipe, at lower velocity.

The pump won't care, will it?

I'll be going to bed now.

sounds like a water propelled rocket

trial and error, start small then work you way up.You will find a pattern as you increase size or number of holes, this will give you a fair indication on you target.

In other words we don't know either!