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When is the Hydrograph called as a unit hydrograph?

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When is the Hydrograph called as a unit hydrograph?

(a) When 1cm of runoff is resulted from a rain fall

(b) When 3cm of runoff is resulted from rainfall

(c) When 1mm of runoff is resulted from rainfall

(d) When 3mm of runoff is resulted from rainfall

The question was posed to me in examination.

Enquiry is from Hydrographs in portion Hydro Electric Power Plant of Energy Engineering

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Correct option is (a) When 1cm of runoff is resulted from a rain fall

For explanation: If the rainfall distribution in the storms is similar with respect to time and area, the ordinate of each hydrograph will be proportional to volume of runoff. The unit hydrograph is a hydrograph with a volume of 1cm runoff resulting from a rainfall of specified duration and a real pattern.

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