Building a sump - flow numbers

[caspervtx]

I apparently am search challenged.

I can not seem to find any links that tell how to determine the flow rate out of a tank and into a sump and thus the matching flow back up from a pump.
Can someone point me to the right place?

 

[caspervtx]

 

[fraggle rock]

rtcile I found on poump rates/head pressure and gph, hoe it helps
http://www.aquarium-supply.biz/Aquar...m_Pump_s/8.htm