Question
Download Solution PDFThe rainfall on five successive days on a catchment was 2, 6, 9, 5 and 3 (in cm units). If the ϕ-index for the storm is taken as 3 cm/day, the total direct runoff from the catchment will be:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
The ϕ-index represents an infiltration rate where the infiltration rate surpasses the threshold at which the volume of runoff equals the volume of rainfall.
Calculation:
If, Rainfall < ϕ-index; Runoff = 0
and Rainfall ≥ ϕ-index; Runoff = Rainfall - ϕ-index
The total direct runoff from the catchment = 0+(6-3) + (9-3) + (5-3) + (3-3) =11 cm
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