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(一)进行水利水电工程的规划设计,确定泄洪建筑物尺寸,按照下游防洪要求而确定防洪库容的大小,以及为解决某特定目标的防洪问题,都需对有关的地点或河段,按照指定的标准,预估出具有一定特性的洪水,即设计洪水.设计洪水具有两重性质:一是按照什么标准来作为计算的根据,一是对于这种标准如何确定其有关的值及其时程分配,如峰、量和过程线.标准和数据虽然是设计洪水的不同特征,却又是有些关联的,应当根据工程及其下游的特定情况,把安全与经济这一对矛盾,合理地统一起来,以求出最适宜的标准和数据.但是目前常用的办法,多首先按工程规模和等
(1) To carry out the planning and design of water conservancy and hydropower projects, determine the size of flood discharging structures, determine the size of flood control capacity according to the requirements of flood control in the downstream, and solve the flood control problems of a specific target, all relevant sites or river sections shall be designated as specified , And predicts floods with certain characteristics, namely design floods.Design flood has two properties: First, according to what criteria it is used as the basis of calculation, and first, how to determine its relevant value and its time distribution , Such as the peak, the quantity and the process line. Although the standards and data are different characteristics of the design flood but are somewhat related, the contradiction between safety and economy should be reasonably unified according to the specific circumstances of the project and its downstream , In order to find out the most suitable standard and the data.But at present the commonly used method, mainly according to the project scale and so on