Approximation of Rainfall Intensity-Duration Frequency for Port Harcourt City, Nigeria
Keywords:
Coefficient of determination, Intensity-Duration-Frequency (IDF), Mean Absolute Error (MAE), Nash-Sutcliffe Efficiency (NSE), Return period, Root Mean Square Error (RMSE)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 Port Harcourt Metropolis, Nigeria. 40 years rainfall data was obtained from the Nigeria Hydrological Services Agency (NIHSA) and sorted for purpose of frequency analysis. Storm durations of 5, 10, 30, 60, 120. 240, 360 and 720 minutes, and for respective frequency of recurrence 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 24.0576, 35.0875, 0.99124571 and 0.98038 which explains the model to be reliable for prediction.
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