发源于河北省涞源县太行山东麓的拒马河流经北京市房山区，流至张坊镇分成南北二支，北支称北拒马河。北拒马河顺涿州而下与大石河、小清河汇流南折流至白沟镇。因此，涿州因山区泄洪造成大量积水。

zhejin300wanyuanxiaoshouedaibiaolezhongduoduzhe、wangyoudeshanxin。tushuchubanxingyeshouzaijigouyeyidiyishijiankaishimouhuafusu，zhengquzaoricongchenzhongdajizhongzhanqilai。这(zhe)近(jin)3(3)00万(wan)元(yuan)销(xiao)售(shou)额(e)代(dai)表(biao)了(le)众(zhong)多(duo)读(du)者(zhe)、(、)网(wang)友(you)的(de)善(shan)心(xin)。(。)图(tu)书(shu)出(chu)版(ban)行(xing)业(ye)受(shou)灾(zai)机(ji)构(gou)也(ye)已(yi)第(di)一(yi)时(shi)间(jian)开(kai)始(shi)谋(mou)划(hua)复(fu)苏(su)，(，)争(zheng)取(qu)早(zao)日(ri)从(cong)沉(chen)重(zhong)打(da)击(ji)中(zhong)站(zhan)起(qi)来(lai)。(。)