Precipitation of 20cm was observed due to 24hr storm over a catchment area of 2 km. The initial infiltation capacity of the infiltration capacity curve was 0.5 cm/hr. After 15hrs, the infiltraion capacity attained a constant value of 0.1 cm/hr. Horton's constant k = 5hr'. The readings of the pan installed in the catchment showed a decrease of 0.5cm in the water level during 24hrs of its operation. Determine the runoff from the catchment Assume a pan coefficient of 0.7. All other losses were negligible.

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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.