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Question
An 8-hour storm with incremental rainfall during each successive hour is tabulated herewith. What will be the correction to total runoff when, whereas the actual φ index was 0.5 cm/hour, a wrong magnitude of 0.6 cm/hour was adopted in computing the total runoff?

Time from start (hour)

Incremental rainfall in each hour (cm)

1

0.4

2

0.8

3

1.2

4

0.9

5

1.8

6

1.0

7

0.3

8

0.8
A.
+ 1.0 cm
B.
+ 0.9 cm
C.
+ 0.8 cm
D.
+ 0.6 cm
Answer ( Option D)

+ 0.6 cm

Solution

Runoff when Φ index = 0.6 cm/hr
Runoff = 6.5 – 0.6 × 6 = 2.9 cm
Runoff when Φ index = 0.5 cm/hr is
6.5 – 0.5 × 6 = 3.5 cm
Correction to be applied
= 3.5 – 2.9 = 0.6 cm

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