Rational Method: Peak Runoff Calculation

Use Q = CiA to compute peak runoff from a small urban watershed.

Practice Questions

Q1.A 5-acre residential area (C = 0.45) experiences a design storm with intensity i = 3 in/hr. What is the peak runoff Q using the Rational Method?

Q2.If the same watershed is paved (C increases to 0.85), by what factor does the peak runoff increase compared to the residential scenario?

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