A Question On Chompers DIY Overflow

[Zeetrain]

I was just wondering why the dimensions for the 55 gallon were what they are. Can it be shorter? Would those dimensions work on a 4 foot 90 gallon? Could they be shorter on a 90 gallon? Im gonna be using 1.25" PVC. Does anyone know what dimesnions I should use for the overflow?

 

[kdog]

As long as lenghts 'A' and 'B' are the same length and meet the following length for your pipe diameter you should be fine

Maximum Gravitational Vertical Flow - This is what we look for when sizing drains or DIY overflows. The flow under the power of gravity reaches a maximum in the same way an object reaches Terminal Velocity as it falls through the air. The gravitational force is countered by the waters viscosity (resistance to flow) and the frictional resistance of the pipe. The viscosity creates a minimum vertical length to acheive the maximum flow. If the vertical pipe length is less than the minimum, the flow rate will be somewhat less than the pipes maximum potential.
Min. Vertical Length
1/2 = 2"
3/4 = 5"
1.0 = 9"
1.25= 14"
1.5 = 20"
2.0 = 36"