How to determine the runoff coefficient using rainfall and stream flow
Answers
Question:-
How to determine the runoff coefficient using rainfall and stream flow¿?
Answer:
A = catchment area (ha). The runoff coefficient (Cy) is defined as the ratio of the peak runoff rate of a given ARI to the mean rate of rainfall for a duration equal to the catchment 'time of concentration' and of the same ARI. the ratio of catchment to cultivated area, as described in chapter 4, it is necessary to assess either the annual (for perennial crops) or the seasonal runoff coefficient. This is defined as the total runoff observed in a year (or season) divided by the total rainfall in the same year (or season).
Explanation:
It is measured by determining the soil type, gradient, permeability and land use. The values are taken from the table below. The larger values correspond to higher runoff and lower infiltration.Runoff coefficient is a dimensionless factor that is used to convert the rainfall amounts to runoff. It represents the integrated effect of catchment losses and hence depends upon the nature of land surface, slope, degree of saturation, and rainfall intensity
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