Frequency and Risk Analyses in Hydrology

2-parameter ALPHA analysis annual applied approximation average base Benson calculated CFS ON AUG Chapter characteristics coefficient of skew computed confidence CONTINUE correlation corresponding CRUZ Cumulative Probability defined derived described determined discharge distribution equal Equation error estimate event magnitudes example expression extremal distribution flood flows FORMAT frequency analysis frequency curve frequency factor function gauging given gives hydrologic independent interval Library limits logarithms lognormal lognormal distribution matrix maximum likelihood mean mean annual method of moments normal normal distribution Note observed obtained occur origin parameters Pearson type plotting position points population precipitation probability probability distribution procedure recorded recorded events reduced regional regression return period risk River sample square standard deviation standard error stations statistical Substituting Table techniques tion University values variable variance variation WRITE zero