A 6 hours storm had 4 cm of rainfall and the resulting runoff was 2 cm. If ϕ index remains at the same value, the runoff due to 10 cm of rainfall in 12 hours in the catchment is
A. 4.5 cm
B. 6.0 cm
C. 7.5 cm
D. 9.0 cm
Answer: Option B
Solution(By Examveda Team)
Infiltration Rate =2/6=1/3cm/hrInfiltration=1/3*12=4cm
Run-off= 10-4=6 cm
This Question Belongs to Civil Engineering >> Irrigation Engineering
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Pi index=( precipitation-Runoff) /time
=4-2/6
= 0.33cm/h
Runoff due to 10cm of rainfall= 10- 0.33*12
=10-3.9
=6.04 ie 6 cm