本帖最后由 WeSay 于 2009-8-19 22:47 编辑 % r3 Q* m( L" U/ ]" n
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A sump pump is part of a building's foundation drainage system and it has been a requirement since 1988.' C* W! A0 n0 Q9 D8 `" U |( N2 h- Z1 o
5 u: b2 b5 h) |In newer areas the sump pump discharges onto the ground, with the exception of areas that have a very high ground water table, or those adjacent to a lake, ravine or river. In those areas, sump pumps must connect to a storm service pipe to minimize soil erosion. A geotechnical engineer determines if this is necessary before the area is developed.