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Jan 1, 2014 · 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.
Runoff coefficient C is defined as the ratio of the peak runoff rate to the rainfall intensity. Values of C for different slopes and land use conditions, determined from field observations are given in Table 3.2.
Some of the important empirical runoff estimation formulae used in various parts of India are given below: 19.1.1 Binnie’s Percentages. Sir Alexander Binnie measured the runoff from a small catchment near Nagpur (Area of 16 km2) during 1869 to 1872 and developed curves of cumulative runoff against cumulative rainfall.
Jun 1, 2022 · Runoff coefficient (C) is defined as the ratio of the volume of water superficially drained during rainfall to the total volume of precipitation during a certain period ( Bedient et al., 2013; Júnior, 2015 ).
Where Q = design discharge (m 3 /s), C = runoff coefficient (dimensionless), I = design rainfall intensity (mm/h), and A = watershed drainage area (km 2). Modified Rational Method. The Modified Rational Method (as shown in Fig. 11.1) provides a way to calculate the hydrograph from a catchment based on rational method, C values and the peak ...
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.
May 9, 2024 · 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.
