How do you quiet the overflow box

[Carz]

So I am upgrading for the third time to a 250. Never had the overflow box in the back. I am running a bean animal style overflow. I am running the test water in the whole system now and the overflow is not quiet. The water level never reaches the emergency drain but on the open channel line (the higher drain line) seems to be the problem of the sound. I am just not sure what to adjust. It seems like I am just in the basement turning gate valves and guessing what to do. Anybody know how to do this so I am not running up and down the stairs 30 times an hour.

 

[motortrendz]

Should have put the gates under your tank not in the basement... that's al.long way for back pressure to adjust in the pipe.

 

[Justfebreezeit]

You want it to barely trickle down your secondary. Open/close your main drain valve till it just barely reaches the secondary.

 

[Carz]

I am going to switch the valves. Dont know what I was thinking on that one, but I think I got it flowing pretty good now.
The next question is how can I lower the water level in the tank? Is that the return pump pumping too fast?

 

[motortrendz]

You can slow the return pump with a valve if it's an Ac pump. If it's a dc pump you can lower the flow with the controller.

 

[foxt]

I am going to switch the valves. Dont know what I was thinking on that one, but I think I got it flowing pretty good now.
The next question is how can I lower the water level in the tank? Is that the return pump pumping too fast?

The water level in the tank is set primarily by the height of your weir for the overflow, and then maybe by the height of the drains in the overflow.

That said, if the flow rate is too much for the weir, the water level will increase over the bottom of the weir to increase the volume of water flowing over the weir. You essentially flood the weir because you are pushing too much water through it at the rate you are trying to run.

The other thing that can affect the height of the water against the weir is having the siphon and/or the trickle height set too high in the overflow box.

 

[Carz]

My water level is set about half way at the weir. Does that seem normal? I have the overflow set really good I am assuming since I cant hear and water.

 

[foxt]

Where is the water level in your overflow relative to the water level in your tank?

 

[Carz]

the overflow level is about 1/4" lower

 

[foxt]

You can try lowering the level of the pipes in the overflow box, that should bring the water level down. It just may be that the flow you are pushing through the weir requires a certain amount of height above the weir to function.

You can use this calculator to estimate how high the water should be over your weir. You have to account for the true area of the weir (taking into account the teeth). The height in that calculator will tell you how high above the bottom of the weir the water will rise for the selected flow rate.

Rectangular Contracted Weir Calculator