本帖最后由 WeSay 于 2009-8-19 22:47 编辑 ' }1 @* e7 A! K0 e U4 Z, ~ " d# S& [! N) yA sump pump is part of a building's foundation drainage system and it has been a requirement since 1988.4 _% d/ v7 O* X5 H/ |1 L0 X
' X5 m$ o5 ^& V5 c" x5 vIn 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.