Abstract: This paper recommends a method about how to calculate the permissible velocity correction factors.This method brings on the formula of calculating the correction factors.It can directily calculate the value of permissible velocity correction factors according to the hydraulic radius of the trench and the scabrous factors, instead of the traditional method of estimating the value in a certain range.The example shows the method is easy to do.

Key words: trench, permissible velocity, correction factors, method of calculation

摘要： 介绍计算渠道不冲允许流速修正系数的一种方法.该法提出了计算修正系数的公式,根据渠道的水力半径和壁面的粗糙系数,可直接计算不冲允许流速修正系数的值,无需再采用某一范围内估计取值的传统方法.算例表明,该方法简便易行.

关键词: 渠道, 允许流速, 修正系数, 计算方法