Question

An S-curve hydrograph has been obtained for a catchment of $360k{m}^2$ from a 5 hour unit hydrograph. The equilibrium discharge for the S-curve is _________ $m^3/sec$

• A. 200

Answer 1

The correct option is A 200
The equilibrium discharge is expressed as

$Q_s=\frac{A}{D}\times {10}^4{m}^3/h$

Where A is area of catchment in $k{m}^2$ and D is duration in hours.

$Q_s=\frac{360}{5}\times {10}^4=72\times {10}^4{m}^3/h$

$=\frac{72\times {10}^4}{3600}{m}^3/s=200m^3/s$