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Estimate the peak rate of runoff for a 10 year frequency from a watershed of 25 hectares, having 15 hectares under cultivation (C = 0.5), 5 hectares under forests (C = 0.4) and 5 hectares under grass cover (C = 0.45).
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.
There many empirical or Semi-Empirical formulae used to estimate the runoff discharge from catchment area. These formulae can be classify into three categories; . Formulae consider the area only into calculation, like Dickens, Ryves, Ingles and others. The formulae take forms as . Q=CA. n. 2. ; n exponent is almost ˂1. 3.
Jun 6, 2018 · Runoff may be classified according to speed of appearance after rainfall or melting snow as direct runoff or base runoff, and according to source as surface runoff, storm interflow, or groundwater runoff.
Dec 28, 2020 · Scientists and engineers define runoff as the part of precipitation, snow melt or irrigation water that gathers when the land cannot absorb it. From these observations, researchers can them account for factors like how quickly it emerges after rainfall or whether it can be called surface runoff, interflow or ground runoff.
Accurate computation of runoff amount from a watershed is difficult, as it depends on several factors concerned with the atmosphere and watershed characteristics, to evaluate which effect on runoff is not so easy.
In this article we will discuss about:- 1. Meaning of Runoff 2. Types of Runoff 3. Factors Affecting Runoff 4. Runoff Cycle 5. Computation. Meaning of Runoff: Rainfall is the primary source of water for runoff generation over the land surface.
