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。

jiayoubaoshangshihou，zhongtuwangguanwangzai3rishangwuchuxianleyongji，bushaoxiangxiadanzhichidewangyoudabukaiwangzhan。wangyoumokacheng“maileyishangwudoumeichenggong”。jiezhi3ri18shi，jinguanwangqudaojiuyixiaoshou29727tao，17shizhi18shi，yigexiaoshineijiushouchu1600tao，kejianduzhezhichireduzhigao。加(jia)油(you)包(bao)上(shang)市(shi)后(hou)，(，)中(zhong)图(tu)网(wang)官(guan)网(wang)在(zai)3(3)日(ri)上(shang)午(wu)出(chu)现(xian)了(le)拥(yong)挤(ji)，(，)不(bu)少(shao)想(xiang)下(xia)单(dan)支(zhi)持(chi)的(de)网(wang)友(you)打(da)不(bu)开(kai)网(wang)站(zhan)。(。)网(wang)友(you)摩(mo)卡(ka)称(cheng)“(“)买(mai)了(le)一(yi)上(shang)午(wu)都(dou)没(mei)成(cheng)功(gong)”(”)。(。)截(jie)至(zhi)3(3)日(ri)1(1)8(8)时(shi)，(，)仅(jin)官(guan)网(wang)渠(qu)道(dao)就(jiu)已(yi)销(xiao)售(shou)2(2)9(9)7(7)2(2)7(7)套(tao)，(，)1(1)7(7)时(shi)至(zhi)1(1)8(8)时(shi)，(，)一(yi)个(ge)小(xiao)时(shi)内(nei)就(jiu)售(shou)出(chu)1(1)6(6)00套(tao)，(，)可(ke)见(jian)读(du)者(zhe)支(zhi)持(chi)热(re)度(du)之(zhi)高(gao)。(。)