城市排水与防洪排涝设计中重现期的确定

On Determination of Return Period in Design of Urban Drainage and Flood Control & Draining

城市排水与防洪排涝是关系到城市安全、环境保护的基础工程,但城建的给排水专业和水利专业所涉及的重现期却不一致,使整个城市的水体排放设计不能达到一个统一的标准。该文着重从样本选取方法上,分析了重现期产生差别的原因,指出对某一地区而言,只要根据水利部门由年最大值法和城建部门由年多个样法计算的暴雨强度公式,就能推求出在相同降雨历时重现期的对应关系。

The urban drainage and flood control & draining is a fundamental engineering for city security and environment protection. However, the return periods are different in water & drainage field and water conservancy field, and there is no unified standard for the design of water discharging in a city. Based on taking methods of the samples, analysis is made on producing causes of different return periods, and it is found out that for a certain area, the corresponding relations of return periods in same rainfall durationscould be calculated according to storm intensity formulas computed from maximum value method by water conservancy people and from annual multiple method by municipal engineering people respectively.