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Two successive Iso-hyetes in the basin drawing of catchment area are measured using _______

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Two successive Iso-hyetes in the basin drawing of catchment area are measured using _______

(a) Planimeter

(b) Manometer

(c) Mass flow meter

(d) Chronometer

This question was addressed to me at a job interview.

Question is taken from Rainfall and its Measurement topic in chapter Hydro Electric Power Plant of Energy Engineering

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Right option is (a) Planimeter

Easiest explanation: Generally interval of iso-hyete is one cm. after drawing the iso-hyetes; the area between two successive iso-hyetes is measured by using a Planimeter. The rest of the procedure of finding out the mean rainfall is similar to that described in the second method.

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