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GATE Exam Questions

Q1: The ordinate of the Instantaneous Unit Hydrograph (IUH) of a catchment at any time t, is

A The slope of the 1-hour unit hydrograph at that time

B The slope of the direct runoff unit hydrograph at that time

C Difference in the slope of the S-curve and 1-hour unit hydrograph

D The slope of the S-curve with effective rainfall intensity of 1 cm/hr

ANS:D - The slope of the S-curve with effective rainfall intensity of 1 cm/hr

The limiting case of a unit hydrograph of zero duration is known as instantaneous unit hydrograph (IUH). The ordinate of one IUH at any time 't' is the slope of S-curve of intensity 1 cm/hr.



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