Question
Download Solution PDFThe rainfall observed for five successive days in a catchment is 2, 3, 4, 5 and 6 cm. Compute the direct runoff from the catchment due to this rainfall. The ϕ index for the rainfall is assumed to be 2 cm/day.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Runoff depth generated for a given period is given as
R = P - ϕ if P ≥ ϕ
R = 0 if P < ϕ Where,
P is the rainfall and
ϕ is the infiltration loss in that given period.
Calculation:
| Rainfall,p | time(days) | ϕ-Index(cm/day) | Runoff,R(cm) | Remark |
| 2 | 1 | 2 | 0 | p < ϕ |
| 3 | 1 | 2 | 1 | p > ϕ |
| 4 | 1 | 2 | 2 | p > ϕ |
| 5 | 1 | 2 | 3 | p > ϕ |
| 6 | 1 | 2 | 4 | p > ϕ |
It is clear that runoff is the summation of above runoffs per day
which is 10cm (Ans)
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