雨(yu)(yu)(yu)水(shui)(shui)口的泄(xie)水(shui)(shui)能(neng)(neng)(neng)力(li),平箅式(shi)(shi)雨(yu)(yu)(yu)水(shui)(shui)口約(yue)為20l/s,聯合式(shi)(shi)雨(yu)(yu)(yu)水(shui)(shui)口約(yue)為30l/s。大雨(yu)(yu)(yu)時易被雜物堵(du)塞(sai)的雨(yu)(yu)(yu)水(shui)(shui)口泄(xie)水(shui)(shui)能(neng)(neng)(neng)力(li)應乘以0.5~0.7的系數。多箅式(shi)(shi)雨(yu)(yu)(yu)水(shui)(shui)口、立式(shi)(shi)雨(yu)(yu)(yu)水(shui)(shui)口的泄(xie)水(shui)(shui)能(neng)(neng)(neng)力(li)經計算確定(ding)。
通過雨水箅子滯(zhi)留部分(fen)雨(yu)水中攜帶的體(ti)積(ji)較大的污物,如(ru)塑料袋,紙殼,食品垃圾等等,截留污物能(neng)(neng)夠防止污染物質(zhi)進入管道沉積(ji),同時也降低過流能(neng)(neng)力,而且一旦塑料凳(deng)將箅(bi)子封死,就(jiu)可能(neng)(neng)導(dao)致積(ji)水等問題,因此需要維護。