F(km2)L(km)J(‰)F1/4J1/3θ(流域特征系数)汇水面积主河槽长度主河槽平均纵坡5.2003.8600.1371.5100.5164.958CVKP公式HtP150.292.1932.85350.382.7094.50700.402.82197.40900.463.21288.902.6322.2390.045全面汇流时2.272校核t洪峰流量80.106校核m/洪水总量112.671αt——与历时t相应的洪量径流系数,取αt=0.75历时暴雨递减指数nSpmt=1/6-1hn10.41094.500.30642.272t=1-6hn20.58994.50校核m/校核t=6-24hn30.725120.660.30632.271假定暴雨历时在1-6小时范围内,以n=n2作初试计算:根据,n,查《手册》图3-2,设计洪峰为:洪水计算结果nS0θμQ4.9582.2392.6320.0450.95180.106m(汇流参数)川西南山地,1θ30时,m=0.221θ0.204注:m计算公式由《手册》查表3-20.3064n计算公式公式lg(Htp/HtP)n1,n2,n3Sp公式-0.4590.41094.5-0.3200.58994.5-0.1650.725120.660.9512.2710.3063