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In which of the following rain gauging method is contour joining the points of equal rainfall is done?

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In which of the following rain gauging method is contour joining the points of equal rainfall is done?

(a) Arithmetic mean method

(b) Thiesson method

(c) Iso-hyetol method

(d) Recording type

The question was posed to me in exam.

This interesting question is from Rainfall and its Measurement in chapter Hydro Electric Power Plant of Energy Engineering

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The correct answer is (c) Iso-hyetol method

The explanation: In iso-hyetol method, contour joining the points of equal rainfall in the given catchment area is done. Iso-hyetes have following properties:

i) Two different iso-hyetes do not cross each other.

ii) Each iso-hyete closes on itself.

iii) Iso-hyete of higher value indicates the higher rainfall.

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