水利化后設計洪水的估算,目前已提出不少方法。长江流域某地区应用单位过程綫法来推求設計洪水。单位过程綫法有它的优点,但也存在一些缺点和問題,其中主要的是:在大面积上应用单位过程綫很难和它的假定相符,因而計算精度受到限制;計算过程此較复杂,工作量大,最后計算的精度如何,又不便于驗証。因此探求大面积水利化后設計洪水比較合 Design floods after water conservancy estimates, many methods have been proposed. Applying Unit Process Method to Estimate Design Flood in Some Area of ​​Yangtze River Basin. Unit process line method has its advantages, but there are also some shortcomings and problems, of which the main one is that it is difficult to apply unit process line in large area and its assumption is consistent, so the calculation accuracy is limited. The calculation process is more complicated, Heavy workload, the final calculation accuracy, but also not easy to verify. Therefore, after a large area of ​​water conservancy design flood more appropriate