Question

Estimate the peak rate of runoff from a 0.15 km^2 drainage basin

that has a runoff coefficient of 0.3 if the rainfall intensity is
60 mm/hr.

Answer 1

To estimate the peak rate of runoff from a drainage basin, you can use the Rational Method, which relates the peak runoff rate (Q) to the drainage area (A), the runoff coefficient (C), and the rainfall intensity (i):

Q = C * A * i

Given:

- Drainage area (A) = 0.15 km² = 150,000 m²

- Runoff coefficient (C) = 0.3

- Rainfall intensity (i) = 60 mm/hr = 60 / 1000 m/hr (convert to meters per hour)

Now, substitute the values into the formula to calculate the peak rate of runoff (Q):

Q = 0.3 * 150,000 m² * (60 / 1000) m/hr

Calculate the value to get the peak rate of runoff in cubic meters per hour.