A cofferdam has to be built in a river to withstand four consecutive flood seasons (i.e., 4 years) and offer protection against a 20-yr flood. The annual flood series for a period of 30 years at the site indicate a maximum flood peak of 8000 cumec and a minimum of 1800 cumec. Assuming that the annual flood peaks plot as a straight line on a semi-log paper (recurrence interval plot- ted as abscissa to logarithmic scale), estimate the magnitude of the 20-yr flood (without plotting) and determine the probability of its occurrence during the life of the cofferdam. (7200 cumec, 18.6%)

Structural Analysis
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Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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HYDROLOGY

FLOOD ESTIMATION AND CONTROL

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A cofferdam has to be built in a river to withstand four consecutive flood seasons (i.e., 4 years)
and offer protection against a 20-yr flood. The annual flood series for a period of 30 years at the
site indicate a maximum flood peak of 8000 cumec and a minimum of 1800 cumec. Assuming
that the annual flood peaks plot as a straight line on a semi-log paper (recurrence interval plot-
ted as abscissa to logarithmic scale), estimate the magnitude of the 20-yr flood (without plotting)
and determine the probability of its occurrence during the life of the cofferdam.
(7200 cumec, 18.6%)
Transcribed Image Text:A cofferdam has to be built in a river to withstand four consecutive flood seasons (i.e., 4 years) and offer protection against a 20-yr flood. The annual flood series for a period of 30 years at the site indicate a maximum flood peak of 8000 cumec and a minimum of 1800 cumec. Assuming that the annual flood peaks plot as a straight line on a semi-log paper (recurrence interval plot- ted as abscissa to logarithmic scale), estimate the magnitude of the 20-yr flood (without plotting) and determine the probability of its occurrence during the life of the cofferdam. (7200 cumec, 18.6%)
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