Unit hydrograph method for flood estimation is applied to :

Large basins

Hilly areas

Small and medium sized basin

All of the above

It is a direct run off hydrograph based on linear systems theory.
It can be used to estimate the flood in the entire water shed irrespective of the topographical difference.
Unit hydrograph assumes uniform distribution of rainfall over the catchment.
Also the intensity is assumed constant for the duration of rainfall excess.

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