I bought a home last year that is a raised rancher. The previous owner added a bath in the lower level and put the sewer pump in the sump pump hole. The sewer pump/sump pump now pumps both sewerage and drain tile water to a public owned pump in the yard that carries it to a holding tank which in turn, pumps it the a sewerage treatment plant. During bad weather, we loose our electricity, while I can add a battery back up to the sewer/sump pump in the lower level, it has no where to go because the sewer pump in the yard will be inoperable. What do I need to do to rectify this problem?