When the operating time is constant, the plastic film cover of precipitation is decided by the rainfall duration and daily evaporation.

当操作时间一定时，塑苫的降水量由降水持续时间和日蒸发量决定。

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Through monitoring farmland runoff and analyzing daily rainfall for 23 years in Shanghai, this paper provided the characteristics of farmland rainfall runoff in Huangpu River Basin.

通过农田降雨径流监测试验，并对上海市历时23年的逐日降雨资料进行汇总与系统分析，确定黄浦江流域农田地表降雨径流特征。

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Its erosivity is usually estimated by the product of rain kinetic energy times the biggest rain density during a certain period, and also, can be determined by the daily rainfall amount.

降雨是影响土壤侵蚀的主要因素，降雨侵蚀力通常用降雨动能和一段时间的最大雨强的乘积表示，简化的计算也可用日降雨量估算。

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He added that long records from upland sites were already rare, and voiced concern that daily rainfall measurements were being halted.

BBC: England's uplands 'get more frequent heavy rainfall'