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Question

Consider the following statements:
1. A 100 year flood discharge is greater thana 50 year flood discharge.
2. 90% dependable flow is greater than 50% dependable flow.
3. Evaporation from salt-water surface is less than that from fresh-water surface.
Which of the statements are correct?

A
1 and 2
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B
2 and 3
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C
1 and 3
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D
1, 2 and 3
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Solution

The correct option is C 1 and 3
For a return period T, the magnitude of flood is given by equation of hydrologic frequency analysis as
xT=¯¯¯x+kσ
The value of k increases with higher return period. So flood magnitude for 100 year return period is more than that of 50 year return period.
% dependable flow means number of times the given discharge is equalled or exceeded.
%Dependability=100Return period
90% dependable flow has lesser return period while, 50% dependable flow has higher return period. So, 90% dependable flow is less than 50% dependable flow.
When a solute is dissolved in water, the vapour pressure is less than that of pure water and hence causes a reduction in the rate of evaporation.

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