查一下，以前经常发洪水，后来的主要问题是被农业与生活污水污染严重。
最干的时候也没断，当然平时水量也不大，为了维持水量，还修了水泥河道防止渗到土地里。
你要知道洛杉矶应该是世界上最大的城市群了，断流太正常了。
Some water usually reaches the ocean, even in the driest summers; although there are historical accounts of the river running dry, there has been constant flow of the river every month since recording of stream flow began in 1929.[2] This is helped by the concrete channel, which limits absorption of water into the earth. Flow, while generally low in volume, can be extremely brisk even in summer.
【 在 l5m6G7P3 的大作中提到: 】
: 代价是洛杉矶河被抽干？
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