二、原理与理论基础 (四)设计暴雨量按洪水评价的方法,预测长重现期的暴雨量,其精度要受到降雨记录长度(这里引用的只有十年降雨资料)的限制,然而从降雨量曲线和洪水频率曲线的平缓的坡率来看,得到一合理的罕见事件的级别特征并不一定必须有长时期的记录。如果得到的降雨频率曲线的形态与气候特征类比区的降雨频率曲线相似,那么,对仅 II. THEORY OF PRINCIPLES AND THEORY (IV) DESIGN OF RAINBED RAINFALL According to the method of flood evaluation, the heavy rain amount in the long-term heavy rainfall period is predicted. The precision is limited by the length of rainfall record (only 10-year rainfall data quoted here). However, Volume curves and the gentle slope of the flood frequency curve show that it is not always necessary to have long-term records to obtain a level characteristic of a reasonable rare event. If the shape of the rainfall frequency curve obtained is similar to the rainfall frequency curve of the climatic features, then only