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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 curve number (also called a curve number or simply CN) is an empirical parameter used in hydrology for predicting direct runoff or infiltration from rainfall excess. [1] .
The Runoff Coefficient describes the percentage of rainfall which runs off a particular surface during a storm event. The higher the value, the greater the quantity of water which will need to be dealt with by the drainage system.
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.
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 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 portion of the precipitation seeps into the ground to replenish Earth's groundwater. Most of it flows downhill as runoff. Runoff is extremely important in that not only does it keep rivers and lakes full of water, but it also changes the landscape by the action of erosion.
When it rains, some water is absorbed into the sponge (infiltration) while some runs off the surface of the sponge and into the stream (runoff). Let's do a thought experiment to understand the impacts of urban development on surface runoff.
approaching 1 for humid regions. The runoff coefficient is defined as the ratio Q/P and expresses the percentage of total precipitation that becomes runoff. There is also a scale affect associated with the regional water balance that is different for humid and arid regions. Figure 16, collated by
The Rational Equation is used to calculate amounts of storm water runoff. The runoff coefficient is calculated based on the permeability of the ground surface condition. Q=CIA