Rainfall of magnitude 4.3 cm, followed by 3.7 cm, occurred on two consecutive 4 h durations on a catchment area of 25 km2 and there resulted a DRH (after isolation of base flow in the flood flow hydrograph) with the following ordinates starting from the beginning of the rainfall. (Adopt trapezoidal formula)Time (hours)048121620242832364044DRH (ordinate m3/sec)0916202017.813.49.46.23.71.80 What is the ∅ index value?

Rainfall of magnitude 4.3 cm, followed by 3.7 cm, occurred on two cons

1.	Rainfall of magnitude 4.3 cm, followed by 3.7 cm, occurred on two consecutive 4 h durations on a catchment area of 25 km2 and there resulted a DRH (after isolation of base flow in the flood flow hydrograph) with the following ordinates starting from the beginning of the rainfall. (Adopt trapezoidal formula)Time (hours)048121620242832364044DRH (ordinate m3/sec)0916202017.813.49.46.23.71.80 What is the ∅ index value?
A.	0.149 cm/h
B.	0.155 cm/h
C.	0.161 cm/h
D.	0.167 cm/h
Answer» C. 0.161 cm/h

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Rainfall of magnitude 4.3 cm, followed by 3.7 cm, occurred on two consecutive 4 h durations on a catchment area of 25 km2 and there resulted a DRH (after isolation of base flow in the flood flow hydrograph) with the following ordinates starting from the beginning of the rainfall. (Adopt trapezoidal formula)Time (hours)048121620242832364044DRH (ordinate m3/sec)0916202017.813.49.46.23.71.80 What is the ∅ index value?
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