I purchased a home about 8 mos. ago, and everytime we get rain, my basement gets between 3 to 8 inches of water from the sanitary lines. There is a very old backwater preventer inside the house but my belief is that it is shot and needs replacement. is there any way to replace this valve without doing it in the house?(in the yard near the cleanout by the street?) is there any other solutions to stop this water from flooding my house every time it rains?