流域蒸发又称流域总蒸发或流域蒸散发。流域内陆面蒸发、水面蒸发和植物散发的综合。是流域水分循坏的重要环节。外流流域降水量的60～70%通过蒸散发返回大气；内流流域蒸发是水分循环的唯一排泄出路。
而在一些干旱地区这个物理规律却使得水分蒸发更快、干旱情况更加严重，我们可以从澳洲的莫瑞达令河流域农业旱情严重发现这一情况。
In arid places the same physics amplify evaporation and drought, visible in the dust-dry farms of the Murray-Darling River Basin in Australia.
塔里木河流域深居内陆，气候干旱、降水稀少、蒸发强烈、水资源匮乏，生态环境极其脆弱。
Tarim river basin situated the inland with dry climate, scarce precipitation, intensive evaporation, water shortage, and extremely fragile. ecological environment.
黑河流域冷季主要受西风带水汽控制，局地蒸发水汽较弱；
This probably because that Heihe River Basin was mainly controlled and affected by water vapor of westerlies, and local evaporation was weak in cold season.
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