Explain the Rational method of peak runoff estimation. Write its assumptions.

Word Count : 436

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The Rational Method is a widely used method for estimating the peak runoff rate in a watershed. It is based on the principle that runoff from a watershed is directly proportional to the rainfall intensity and the area of the watershed. The method uses a simple mathematical formula to calculate the peak runoff rate, which is then used to design drainage systems, such as storm sewers, channels, and culverts.

 

The assumptions of the Rational Method are as follows:

1. The runoff from a watershed is directly proportional to the rainfall intensity and the area of the watershed.

2. The runoff rate is constant for a given rainfall intensity and watershed area.

3. The rainfall intensity decreases as the duration of the rainfall event increases.

4. The runoff rate is independent of the soil type and land use in the watershed.

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Degree : CERTIFICATE PROGRAMMES
Course Name : Certificate in Water Harvesting & Management
Course Code : CWHM
Subject Name : Basics of Hydrology
Subject Code : ONR 2
Year : 2023