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Hydrology & Irrigation

Isohyetal Method

For a large c...

Question

For a large catchment, contours joining points of equal monthly rainfall values were plotted.
The plot is known as:

A

Isohyetal map

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B

Mass curve

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C

Isobar map

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D

Thiessen polygon

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Solution

The correct option is A Isohyetal map

Isohyetal is a line joining points of equal rainfall magnitude.

Mass curve of rainfall is a plot of accumulated precipitation against time.

Isobar map is the plot of line marking places of equal barometric pressure.

Theissen polygon is the area of catchment bounded by perpendicular bisector of line joining raingauge and catchment boundary.

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