Discussion
The hydrograph that would result from 1cm(or 1mm) of excess rainfall occurring during a storm of particular duration and assumed to be the representative of the runoff process for a watershed is called-
Answer: D
It is the Unit hydrograph.
Sherman's unit hydrograph (1932) is the direct runoff hydrograph resulting from one unit (1 cm, or 1 mm) of excess rainfall falling uniformly over the watershed at a uniform rate during a specified duration. Assuming the watershed responds linearly, it represents the runoff process and is scaled and superposed to predict runoff from other storms.
A natural hydrograph is the observed one, a synthetic hydrograph is built from watershed characteristics where no records exist, and a dimensionless hydrograph expresses flow and time as ratios.
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