Question

A 6-hour Unit Hydrograph (UH) of a catchment is triangular in shape with a total time base of 36 hours and a peak discharge of $18m^3/s$. The area of the catchment (in sq. km) is

• A. 233
• B. 117
• C. 1.2
• D. Sufficient information not available

Answer 1

The correct option is B 117



We know that,
Area of UH = area of catchment x 1 cm

$\frac{1}{2}\times 36\times 3600\times 18=A\times \frac{1}{100}$

$A=116.64k{m}^2=117k{m}^2$

Hence option (b) is correct.