it will be 2400 gph of sump flow. i know i have far more than that in flow overflow capacities but dad wants to have it capable of increased flow plus i might start to mess around with a wave in there. for dual drains alone at 2400 total flow i need 2 x 1 3/4" drains as my primary then as per the plan the exiting will take any excess flow and act as an emergency. all will have valves to throttle independently if its necessary to do so. between all three i will have the drainage for about 4000gph although i should never meet that ammount
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