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。

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