Drain question

[Mydoghasfleas]

How many gph would three 1” drains be able to handle. It will be gravity fed through 1” bulkheads.

 

[jerrod]

This should get you in the ballpark I used the chart below when trying to figure out mine. A plumber friend said it wont be exact cause to find the true flow you would need to know the height, angle etc. as this will create downward pressures and possibly increase the flow and any elbows or junctions could restrict flow.

 

[KStatefan]

It would depend on if they are full siphon or not and how far down the flow is.

There used to be a calculator on the beananimal website but I think that has been taken down.

 

[Mydoghasfleas]

It would depend on if they are full siphon or not and how far down the flow is.

There used to be a calculator on the beananimal website but I think that has been taken down.

How do you get full siphon? I have attached a pic of my overflow. I plan to put three drain holes simply straight on the bottom of the overflow. I will have about 2000 GPH return. Would three 1” be okay, or should I do two 1.5” drains?