whether you have a pipe that just runs over the side and ends close to the bottom, or a pipe that goes over and ends close to the bottom thru a baffle, the physics is the same. the water will not push itself over the side of the tank simply because there is more water above the end of the pipe. you will have to manually start the siphon over the side to get to the pump and if that siphon is broken during a power outage for some reason, the pump will not be able to start it again.