本帖最后由 WeSay 于 2009-8-19 22:47 编辑 1 t& d9 P6 m, B" g( |% j" K - O1 A3 T6 g* F- FA sump pump is part of a building's foundation drainage system and it has been a requirement since 1988./ o% j+ }9 }7 m! y
# a8 Z5 g& t1 JIn 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.