Another way of presenting these data is by a histogram or frequency distribution. 另一種展示這些數據的方法是通過直方圖或者頻率分佈。
The overtopping model accounts for the uncertainties involved in hydrological observations and flood frequency models. 水壩溢頂模式考慮水文的觀測量之不確定性以及洪水頻率分佈曲線之不確定。