本帖最后由 WeSay 于 2009-8-19 22:47 编辑 6 R+ N, |/ S. f : K+ z, ~, o J' ?; ]' U. yA sump pump is part of a building's foundation drainage system and it has been a requirement since 1988.- T F* ^# Z) F& Z9 w
: M2 i) x3 S. S) o; HIn 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.