Another way of presenting these data is by a histogram or frequency distribution. 另一种展示这些数据的方法是通过直方图或者频率分布。
The overtopping model accounts for the uncertainties involved in hydrological observations and flood frequency models. 水坝溢顶模式考虑水文的观测量之不确定性以及洪水频率分布曲线之不确定。