Plumbing question

[cchomistek]

Ok I am thinking of doing a build where I have a tank and sump in two different rooms. My problem is with the drain line going to the sump. My thoughts are to have a small tank sealed with two bulkheads in it like a reservoir tank and then have an external pump that will pump up about 9 ft and then go across about 15ft and drop down into the room where the sump will be located.

My issue is if this pump under the tank ever decides to fail and the return pump in the sump room keeps going what will be the outcome. Since the water will be traveling above the water line in the tank I will assume that it will only rise as high as the water level and then fill up the overflow box and flood that. Now this being the case if I had an emergency overflow going to a small reservoir tank that will hold the amount of water that my return section of my sump holds would this not eliminate cover me in case this happens??

Any suggestions are welcome. The reason I am looking at going this way as there is not room underneath the tank to put a decent size sump.

Thanks
Craig