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GATE Exam Questions

Q1:
A-2-hour unit hydrograph can be approximated as trapezoidal as shown in the below figure. The unit hydrograph refers to catchment of area

A 138.24 km2

B 0.0384 km2

C 384 m2

D 3840 m2

ANS:C - 384 m2

If peak discharge is taken as 24m3 means Qp=24m3.

And area of trapezium is h/2(a+b) means=Qp/2(a+b)x60x60=Area x 10^4 by solving this we are getting 138.24km^2.

Just help me out how would you get the catchment as 384 km^2



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