SCS National Engineering Handbook

0.1 Percent Chance 1-day flow Annual peak discharge Basic coefficient of determination column continuous random variables correlation coefficient criterion variable curve for example data for example degrees of freedom develop discrete random variable drainage area error of estimate F-test Figure flood Flow CFS-Days frequency analysis gage gamma gamma distributions high outliers historic data hydrologic hydrologic data hydrologic studies log-normal distribution log-Pearson logarithmic transformation low outlier mean flow measurement mixed distribution normal distribution NORMAL ORDER STATISTICS Normal Standard Deviates outlier criterion values partial-duration Peak Discharge CFS peak flow Pearson Percent Chance 100 Plot the data plotted data plotting positions prediction equation predictor variables prob probability density function probability levels probability paper procedures quency curve regression coefficients regression equation relationship residuals runoff sample data sample statistics shape parameter skew streamflow Table tion TR-38 K value trend U.S. Geological Survey VALUES OF NORMAL variance Water Weibull WRC Bulletin 17B zero