Rational Method Peak Runoff for 10 ha
Easyrational methodrunoff
A 10 ha catchment has a runoff coefficient of 0.60 and a design rainfall intensity of 50 mm/h. Using the rational method, the peak runoff is most nearly:
- A0.083 m³/s
- B0.833 m³/s
- C1.389 m³/s
- D300.000 m³/s
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Answer: B. 0.833 m³/s
Equation: rational method in SI units, Q = CiA/360 with i in mm/h, A in hectares, Q in m³/s. Values: C = 0.60, i = 50 mm/h, A = 10 ha. Step 1: CiA = 0.60 × 50 × 10 = 300. Step 2: Q = 300/360 = 0.833 m³/s. 300 skips the unit conversion; 0.083 divides by 3,600; 1.389 leaves out C.
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