Flow rate of various size pipe
 

ive been searching everywhere to find the flow rate of a 1 inch and 2 inch overflow pipe
thanks

Try this chart.

http://flexpvc.com/WaterFlowBasedOnPipeSize.shtml

awsome thanks thats exactly what i was looking for

see often 1" will drain 600 gph (RC calculator) with no pressure, but there are other factors. eg I've got a 1" bulkhead on a shallow CtoC and can only get about 300 gph.