If a 4-hour unit hydrograph of a certain basin has a peak ordinate of $80 m^{3} / s,$ the peak ordinate of a 2-hour unit hydrograph for the same basin will be

equal to 80 m^{3} / s

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greater than 80 m^{3} / s

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less than 80 m^{3} / s

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between 40 m^{3} / s t o 80 m^{3} / s

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Solution

The correct option is B $greater than 80 m^{3} / s$
With the reduction of unit hydrograph duration, 1 cm excess rainfall will occur in reduced period. So peak ordinate of UH will increase and time base will decrease. Thus, the peak ordinate of 2 hr UH will be greater than
$80 m^{3} / s .$

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