利用二重积分表示流域降雨总量。
The watershed total rainfall is expressed by using double integration.
目前的降雨总量与往年持平，洪水的危害也不是特别的严重。
So far rainfall has been low compared to recent years, and the damage from flooding has not been particularly severe.
卫星提供了降雨分布的一致数据，而雨量数据记录了各地区当地的降雨总量。
Satellites provide a consistent view of the distribution of rain, while rain gauges record local rainfall totals.
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