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Approximation of Rainfall Intensity-Duration Frequency for Owerri Metropolis, Nigeria

Egop S. E., Arimieari, L. W.

Abstract


Approximation of the Rainfall Intensity-Duration-Frequency (IDF) relationship is one of the most commonly used tools in water resources engineering. The aim of this research is to establish the rainfall intensity-duration-frequency model/curves for Owerri Metropolis, Nigeria. 30 years rainfall data was obtained from the Nigeria Hydrological Services Agency (NIHSA) and sorted for purpose of frequency analysis. Storm durations of 10, 30, 60, 120 and 240 minutes, and for respective return periods of were adopted for the derivation of the models. The generalized empirical technique was used to develop the IDF curves for this study. The Nash-Sutcliffe efficiency (NSE), Mean Absolute Error (MAE), Coefficient of Determination ( ), and Root Mean Square Error (RMSE) were used in the validation of the IDF formulation. The MAE, RMSE NSE and  were 33.9209, 5.8241, 0.9599 and 0.9634 which explains the model to be reliable to prediction.


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References


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