Question
Download Solution PDFA catchment area of 10 km2 has recorded a rainfall of 25 mm/h. Assuming a runoff coefficient of 0.3, the peak discharge from the catchment using the rational method is ________.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Rational method of flood measurement
\({Q_P} = \frac{1}{{36}}k{P_c}A\)
Where,
QP = peak discharge in m3/s.
K = Runoff coefficient
Pc = Rainfall in cm/hr.
A = Area in hectare
Provided,
1) Catchment area should be less than 50 km2
2) Time of rainfall should be greater than time of concentration.
Calculation:
\({Q_P} = \frac{1}{{36}} \times 0.3 \times 2.5\;cm/hr \times 10 \times {10^6} \times \frac{1}{{{{10}^4}}}\)
\({Q_P} = 20.83{m^3}/s\)
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