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Hydrology & Irrigation

Isohyetal Method

Mean precipit...

Question

Mean precipitation over an area is best obtained from gauged amounts by

A

arithmetic mean method

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B

Thiessen method

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C

linearly interpolated isohyetal method

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D

orographically weighted isohyetal method

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Solution

The correct option is D orographically weighted isohyetal method
Isohyets are contours of equal rainfall. The orographically weighted isohyets are prepared by tracing paper for mountainous areas and therefore they are more accurate than linearly interpolated isohyets.

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