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Above which range should be the unit hydrographs be used?

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in Energy Engineering by (91.0k points)
Above which range should be the unit hydrographs be used?

(a) Around 5000 sq km

(b) Over 2500 sq km

(c) Around 4000 sq km

(d) Below 5000 sq km

I have been asked this question in examination.

This intriguing question comes from Hydrographs in portion Hydro Electric Power Plant of Energy Engineering

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Correct option is (a) Around 5000 sq km

To elaborate: In practice, only a limited number of unit hydrographs are used for a given basin. It is also common practice to neglect the variations in rainfall distribution within the basin area. Hence it is not advisable to use unit hydrograph method for basins over 5000 sq km.

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