Herbie's way less messing around than a durso (no drills involved to tune)
Its stupid simple, 1 bulkhead becomes your primary drain, add a grill or leave open - near where that line enters your sump - add a valve, preferably a gate valve. That second bulkhead - is now your emergency overflow, add a standpipe in the overflow, make it tall enough so that it's about as high as you'd want the water to run. Straight run to the sump with that (no valves).
start'er up - take that valve on the primary drain, crank her down until water level is stable in the overflow.
Thats official rule - I crank mine down so that just a trickle's going down the emergency overflow, less fiddly when done that way I find.
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