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Estimation of Rainfall Duration Frequency Curve for Owerri, Nigeria

Arimieari L. W., Egop S. E., Arigbe O. F.

Abstract


Force Length Recurrence (IDF) relationship is perhaps of the most usually involved device in water assets designing. The motivation behind this study was to foster precipitation power length recurrence models/bends for Owerri City, Nigeria. Precipitation information was gotten from Nigeria Hydrological Administrations Office (NIHSA) and arranged for recurrence examination. Two different frequency analysis techniques namely, Normal and Gumbel distributions were used to develop the IDF relationships for Owerri. Storm durations of 10, 15, 30, 60, 120 and 240 minutes, and return periods of 5, 10, 15, 20, 25, and 30 years were adopted for the derivation of the models. Talbot empirical technique was used to develop the IDF curves for this study. The maximum observed rainfall intensity of 22420 mm/hr was recorded while the lowest observed rainfall intensity was recorded to be 8540 mm/hr. The 30-year mean rainfall intensity was 16606.67mm/hr and the recorded standard deviation was 4288.15mm/hr. Goodness of fit tests were conducted using NSE and R2 with easy fit software to ascertain the best distribution that fits the data.


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References


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