One hour triangular unit hydrograph of a watershed has the peak discharge of 60 m^3/sec. cm at 10 hours and time base of 30 hours. The  index is 0.40 cm per hour and base flow is 15 m^3/sec. (i) Compute the catchment area of the watershed in km^2. (ii) Compute the ordinate of the flood hydrograph at 15th hour, If the rainfall is 5.4 cm. in 1 hour.

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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.