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Hydrology & Irrigation

Hyetograph-Part-1

Rainfall hyet...

Question

Rainfall hyetograph shows the variation of_____.

A

Cumulative rainfall with time

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B

Rainfall intensity with time

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C

Rainfall depth over an area

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D

Rainfall intensity with the cumulative rainfall

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Solution

The correct option is B Rainfall intensity with time
(a) Hyetograph: A hyetograph is a plot of the average intensity of rainfall against the time interval.

The hyetograph is derived from the mass curve and is usually represented as a bar chart.

The area under a hyetograph represents the total precipitation received in the period.

(b) Mass curve of rainfall: A mass curve of rainfall is a plot of the accumulated precipitation against time.

Mass curves of rainfall are used in extracting the information on the duration and magnitude of a storm.

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