Flood Frequency Analysis at Hadejia River in Hadejia – Jama’are River Basin, Nigeria

Abstract

The maximum annual streamflow data of River Hadejia gauging station obtained from the Hadejia Jama’are Komadugu TrustFund, Damaturu for the period of 1963 to 2014 were subjected to flood frequency analysis. Three probability distribution functions; Extreme Value Type 1 (EV-1), Lognormal (LN), and Log Pearson Type III (LP III) were used for the analysis. The models were used to predict and compare corresponding flood discharge estimates at 2, 5, 10, 25, 50, 100 and 200 years return periods. The results for EV-1, LN and LP III at 200 years return period indicated predicted discharge values of 157.419, 169.43 and 135.21 respectively. From the results, lognormal distribution model gives higher flood discharge estimates and therefore it is recommended to be utilized for safe design.

Keywords: Flood frequency, probability distribution, quantile, recurrence interval, discharge.