Problem The observed annual peak discharges for a stream gaging station are shown in the below for the period from 1982 to 1997. The peak discharge follows a log-Pearson ty distribution with the station skew. Determine the peak discharges, 5% (upper) confid limits and 95% (lower) confidence limits for the 2-, 5-, 10-, 25, 50-, and 100-year flo Annual peak discharges Year 1982 1983 1984 1985 1986 1987 Discharge Year (cfs) 2301 2151 3381 2731 3001 2951 1988 1989 1990 1991 1992 1993 Discharg e (cfs) 3031 1571 3611 4191 3201 2231 Year 1994 1995 1996 1997 Discharge (cfs) 1831 3221 1721 2411

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Unit Hydrograph

Hydrology is the science which deals with the study of water on the earth’s surface. The word Hydrograph is derived from the word hydro which means water. Hydrograph is basically a graph in which the discharge is plotted against the time interval at a specific point in a river or other channel. In a hydrograph, the discharge is plotted along the y-axis and time interval is plotted along the x-axis. Hydrograph is used to estimate the runoff. The variations in discharges with the change in time is shown by a hydrograph. It was revealed that the total discharge at an outlet increases with time by a kinematic wave model.