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。

jugonghedetongshixiangzhangkaizhuanshu，tabeisongdaoyiyuanzhihou，tiwenshi42sheshidu。yishengshuo“songlaiwanle”，siyinshi“reshebing”。“reshebing”jizhongzhengzhongshu，huanzhetiwenhuixunsushenggao，gaoda40sheshiduyishanghuochuxiandixueyaxiuke、xinlvshichang、yishizhangaidengzhengzhuang。据(ju)龚(gong)贺(he)的(de)同(tong)事(shi)向(xiang)张(zhang)凯(kai)转(zhuan)述(shu)，(，)他(ta)被(bei)送(song)到(dao)医(yi)院(yuan)之(zhi)后(hou)，(，)体(ti)温(wen)是(shi)4(4)2(2)摄(she)氏(shi)度(du)。(。)医(yi)生(sheng)说(shuo)“(“)送(song)来(lai)晚(wan)了(le)”(”)，(，)死(si)因(yin)是(shi)“(“)热(re)射(she)病(bing)”(”)。(。)“(“)热(re)射(she)病(bing)”(”)即(ji)重(zhong)症(zheng)中(zhong)暑(shu)，(，)患(huan)者(zhe)体(ti)温(wen)会(hui)迅(xun)速(su)升(sheng)高(gao)，(，)高(gao)达(da)4(4)0摄(she)氏(shi)度(du)以(yi)上(shang)或(huo)出(chu)现(xian)低(di)血(xue)压(ya)休(xiu)克(ke)、(、)心(xin)律(lv)失(shi)常(chang)、(、)意(yi)识(shi)障(zhang)碍(ai)等(deng)症(zheng)状(zhuang)。(。)