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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).
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. One is by using the Rational Method, and the other is by using a runoff coefficient table.
EPA’s National Stormwater Calculator (SWC) is a web-based application tool that estimates the annual amount of rainwater and frequency of runoff from a specific site using green infrastructure as low impact development controls.
Rainfall Intensity Formula. Chow lists 24 rainfall-intensity formulas of the form: Eq. 2. I = K · Fn1 / ( t + b )n. Where: I = rainfall intensity, in/h (mm/h) K, b, n, and n1 = coefficient, factor, and exponents, respectively, depending on conditions that affect rainfall intensity, see Table 1.0.
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.
Rational Equation calculator units: ft 3 =cubic foot, m 3 =cubic meter, mm=millimeter, s=second The Rational equation is the simplest method to determine peak discharge from drainage basin runoff.
To determine the volume of stormwater runoff from precipitation, hydrologic calculations are used to quantify precipitation losses which occur as part of the hydrologic cycle.
Brad Lancaster explains about an important concept in rainwater harvesting: the Runoff Coefficient. Anyone looking to seriously design water retention landsc...
The length and slope of each reach should be measured. Determine the time of concentration, tc, for the catchment. Find the rainfall intensity, I, for the design storm using the calculated tc duration-frequency curve. (See Section 4.0 of the RAINFALL chapter.) Determine the runoff coefficient, C.
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.