Search results
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.
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.
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.
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 ).
Learn how to calculate the runoff coefficient (C) for different land uses and surfaces using the rational formula and a table of values.
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.
Jan 29, 2022 · The definition of runoff coefficient is the portion of rainfall that turn into direct runoff throughout an occurrence, and it is a significant perception in engineering hydrology and is extensively applied for design and as a diagnostic variable to show runoff creation in catchments.
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.
