[fishytime]

I see one problem with your drawing Sphelps(other than its far more complicated than it needs to be)....with the two drains merging into one, the only way to tell if something has clogged the primary drain is if you visually inspect it....if you run each individually, the primary is plumbed down below the water line of the sump(making it silent) and the emergency is plumbed just above the water line so you can hear it trickle if something has clogged the primary.