据他观察，被困人员太多，天还下着雨，一趟救援往返大概需要40分钟左右。救援队只能先救出偏远地方老人和小孩。到了晚上，光线不好，水流速度快，水位在不断上涨，救援人员对水域状况不熟悉，增加了救援难度。

congxuyaozhuanyianzhirenyuanzhegexijiejiunengkanchu，xuzhihongqubingfeiyigexianzhidequyu，hedaolianganwangwangyourenjuzhu、shengchan，qijiansheguanlishejiqianjiawanhu，guanxibaixingminsheng。从(cong)需(xu)要(yao)转(zhuan)移(yi)安(an)置(zhi)人(ren)员(yuan)这(zhe)个(ge)细(xi)节(jie)就(jiu)能(neng)看(kan)出(chu)，(，)蓄(xu)滞(zhi)洪(hong)区(qu)并(bing)非(fei)一(yi)个(ge)闲(xian)置(zhi)的(de)区(qu)域(yu)，(，)河(he)道(dao)两(liang)岸(an)往(wang)往(wang)有(you)人(ren)居(ju)住(zhu)、(、)生(sheng)产(chan)，(，)其(qi)建(jian)设(she)管(guan)理(li)涉(she)及(ji)千(qian)家(jia)万(wan)户(hu)，(，)关(guan)系(xi)百(bai)姓(xing)民(min)生(sheng)。(。)