3. Given below are observed flows from a storm of 6-h duration on a stream with catchment area of 500 km^2. Assuming the base flow to be zero. Derive the ordinates of the 6-h unit hydrograph. Time (h) Discharge (m3/s) 0 0 6 100 12 250 18 200 24 150 30 100 36 70 42 50 35 54 60 66 72 25 15 5 0

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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.