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GATE Exam Questions

Q1:
A direct runoff hydrograph due to an isolated storm with an effective rainfall of 2 cm was trapezoidal in shape as shown in the below figure. The hydrograph corresponds to a catchment area (in sq. km) of

A 790.2

B 599.4

C 689.5

D 435.3

ANS:B - 599.4

Area of given DRH = volume of direct run off.

[(1/2)(70+4) * (60)*(60) * (90) ] m3=11988000 m3,
Effective rainfall = 2 cm,
Catchment area = Volume of DRH/Effective rainfall.
11988000 / (2 * 10-2) m2 = 599.4 m2.



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