Consider the following statements about the hydrological aspects of rainfall:
A. Cetyl alcohol is used as chemical for evaporation inhibitor
B. Isohyetal, Thiessen polygon and arithematic-mean methods are used to distribute point rainfall into entire catchment area
C. Falling raindrops are intercepted by vegetation called as throughfall
D. Return period is nothing but the probability of occurrence of an event of a random variable whose magnitude is equal or in excess of a specified magnitude
E. DAD curves are used to estimate the severe floods in the area
Choose the correct answer from the options given below:

Question

Given below are two statements:
Statement (I): In small catchments the overland flow phase is predominant over the channel flow. Hence the land use and the intensity of rainfall have an important role on the peak flood.
Statement (II): On large catchments the effects of land use and intensity of rainfall are suppressed as the channel flow phase is more predominant.
In light of the above statements, choose the most appropriate answer from the options given below.

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The Correct Option is D

Solution and Explanation

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