今年的降雨量接近一般水平。
面雨量峰值出现时间与洪峰的出现时间之间存在着一定的滞后关系，一般是小流域滞后的时间短，而大流域滞后的时间长。
The lag time of the flood peak behind the peak of heavy area rainfall is shorter in small river basins than that in large basins.
面雨量峰值出现时间与洪峰的出现时间之间存在着一定的滞后关系，一般是小流域滞后的时间短，而大流域滞后的时间长。
The lag time of the flood peak behind the peak of heavy area rainfall is shorter in small river basins than that in large basins.
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