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Flood frequency analysis of Gurara River catchment at Jere,
Kaduna State, Nigeria
Ibrahim, H. Manta and Isiguzo, E. Ahaneku*
National Centre for Agricultural Mechanization (NCAM), P. M.
B. 1525, Ilorin, Kwara State, Nigeria.
*Corresponding author. E-mail:
drahaneku@yahoo.com.
Tel.:
+2348035726641
Accepted
9 June, 2009. |
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A flood frequency analysis (FFA) of Gurara River catchments at
Jere, Kaduna State, Nigeria, was carried out. Four
probability distributions were used in the study namely,
Extreme value type1, Normal, Exponential and Pearson type 3
distributions due to their desirable properties. The
analysis was based on seventeen (17) years daily discharge
data converted from gauge height readings. Partial duration
series with a threshold of 273.95 m3/s, being the
lowest annual maximum discharge of the 17 years annual peak
flow was adapted for the FFA. A reduced variate principle
was applied to fit a distribution to the generated data. Of
the four probability distributions employed, Pearson type 3
distribution exhibited the best fit for the data.
Key
words:
Flood frequency analysis, recurrence interval, reduced variate, probability distribution. |
