Question

A triangular direct runoff hydrograph due to a storm has a time base of 90 hours. The peak flow of $60m^3/s$ occurs at 20 hours from the start of the storm. The area of catchment is $300k{m}^2$. The rainfall excess of the storm (in cm), is

• A. 5.40
• B. 6.48
• C. 2.00
• D. 3.24

Answer 1

The correct option is D 3.24



$\frac{1}{2}\times 60\times 90\times 60\times 60=P\times 300\times {10}^6$

P = 0.0324 m = 3.24 cm