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<br />Valves can be jammed open by debris. This is less likely <br />in a manual valve but manual valves have been known to <br />"freeze up" if they are not turned periodically. Both <br />types of valves should have a manhole or other access so <br />they can be cleaned out or repaired. <br /> <br />Overhead sewer: This is the most expensive but the most <br />dependable and convenient method. Your sewer lines would <br />have to be rebuilt so that all house sewage drains to a <br />pump. Sewage is then pumped up to the height of the sewer <br />system's manhole or inlets. From this height, it flows by <br />gravity into the system. With this set up, the sewer system <br />will back up onto the street before it could get high enough <br />to back up into your house. <br /> <br />EXi'?TINC, <br />~~K~ <br /> <br />(Flrz~ Flall. <br /> <br />11> <;e,NEtZ <br /> <br /> <br />NEW <br />t-- DUtil <br />Olf(.1( <br />..-----~ve <br /> <br />J <br /> <br />~v ~:f' <br /> <br />'--~I'" <br />f'UM1'" <br /> <br />Pressures: If you use any of these methods, you should <br />account for two types of water pressure: <br /> <br />1. Your sewer pipes are probably made of clay and were <br />not designed to operate under pressure. Once they <br />become filled up, a valve or plug could create enough <br />pressure to break the pipe. A standpipe or overhead <br />sewer will not relieve this pressure (the pressure at <br />the bottom ~f a four foot column of water is <br />62.5 lbs/Ft X 4 Ft = 250 pounds per square foot). <br /> <br />The best way to deal with this pressure is to minimize <br />the amount of sewer line exposed to the pressure. This <br />could be done by installing a backup valve near your <br />property line. Of course, this merely transfers the <br />problem to the City. Because of this, some communities <br />prohibit backup valves. <br /> <br />25 <br />