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Approximation of Rainfall Intensity-Duration Frequency for Delta State, Nigeria

Egop S. E.

Abstract


A crucial tool in water resources engineering is the approximation of the Rainfall Intensity-Duration-Frequency (IDF) relationship. Establishing the rainfall intensity-duration-frequency model and curves for Delta State, Nigeria, is the goal of this study. The Nigeria Meteorological Agency (NIMET) provided 32 years of rainfall data, which was sorted for frequency analysis. The IDF model was developed using storm durations of 5, 10, 30, 60, 120, 240, 360, and 720 minutes, as well as the corresponding frequency of recurrence. The IDF curves for this investigation were created using the generalized empirical technique. 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 27.62997974, 47.89321636, 0.967710227 and 0.960404175 which explains the model to be trustworthy for prediction.

 


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