rain flow counting method

例句：

1. 1. The rainflow counting method is used to estimate theamount of water that falls from the sky.
   降雨流量计数法用于估算从天空降落的水量。
2. 2. This method is commonly usedin hydrology to measure the amount ofwater flowing through a river or stream.
   这种方法在水文学中常被用来测量河流或溪流中的水量。
3. 3. The rainflow counting method has been shown to bemore accurate than other methods for predictingflood levels.
   研究表明，与其它方法相比，降雨流量计数法在预测洪水水位方面更为准确。