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What is It? The runoff coefficient (C) is a dimensionless coefficient relating the amount of runoff to the amount of precipitation received. It is a larger value for areas with low infiltration and high runoff (pavement, steep gradient), and lower for permeable, well vegetated areas (forest, flat land). Why is It Important?
The runoff coefficient “C” represents the percentage of rainfall that becomes runoff. The Rational Method implies that this ratio is fixed for a given drainage basin. In reality, the coefficient may vary with respect to prior wetting and seasonal conditions.
The runoff coefficient is a dimensionless number that represents the fraction of total precipitation that will appear as runoff in a given area. It varies based on surface characteristics such as land use, soil type, and slope, making it essential for predicting stormwater behavior.
Definition. 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.
A runoff coefficient is a number that relates the rainfall rate and runoff rate. Using the runoff coefficient, scientists and hydrologists can calculate how much water passes over a given area per second. There are two ways you can find the runoff coefficient.
Definition. The runoff coefficient is a dimensionless factor used to estimate the amount of precipitation that will convert to runoff for a specific area, considering the land use, soil type, and slope.
In practice, the runoff coefficient is adjusted with a frequency coefficient (Cf) for the 25-year through 100-year recurrence intervals. The drainage area is the total area tributary to the point of design.
The runoff coefficient is a dimensionless factor that represents the fraction of total precipitation that becomes surface runoff in a given area. It varies based on factors like land use, soil type, and vegetation cover, affecting how much water runs off into streams and rivers versus being absorbed by the ground.
Learn how to calculate the runoff coefficient (C) for different land uses and surfaces using the rational formula and a table of values.
Runoff Coefficient: The runoff coefficient (C) represents the integrated effects of infiltration, evaporation, retention, flow routing, and interception; all of which affect the time distribution and peak rate of runoff.