An annual maximum series for a smallr in Irelandllowing sample statistics for the period990 to 2009Mean annual flood (QBAR) 34.2 m3 s -1 Standard deviation () 10.3 Skewness (g) 1.1 Sample size (N) 20 i) Using thesestatistics together with an EV1 distribution fitted by the standard method of moments, determine the 10, 50 and 100year flow estimates; ii) Estimate the upper and lower 95 - percentile confidence level of QBAR; iii) If the measured mean.annual flood for the remaining record (2010 to 2019) is 25.1 m 3 s -1, comment whether this estimate can be acceptedor rejected at the 95 - percentile confidence interval and briefly give reasons why this flow might have occurred; iv)Explain what is meant by a hydrological outlier and describe, with examples, the main causes of an outlier.
An annual maximum series for a smallr in Irelandllowing sample statistics for the period990 to 2009Mean annual flood (QBAR) 34.2 m3 s -1 Standard deviation () 10.3 Skewness (g) 1.1 Sample size (N) 20 i) Using thesestatistics together with an EV1 distribution fitted by the standard method of moments, determine the 10, 50 and 100year flow estimates; ii) Estimate the upper and lower 95 - percentile confidence level of QBAR; iii) If the measured mean.annual flood for the remaining record (2010 to 2019) is 25.1 m 3 s -1, comment whether this estimate can be acceptedor rejected at the 95 - percentile confidence interval and briefly give reasons why this flow might have occurred; iv)Explain what is meant by a hydrological outlier and describe, with examples, the main causes of an outlier.
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