Abstract

Suitable rainfall-Intensity-Duration-Frequency (IDF) models for Uyo City were developed using the statistical method of least-squares. A total of 18 rainfall models were developed based on 10 years rainfall data. These models are categorically grouped into two sets. The first set contains 10 rainfall models which represent inverse relationship between rainfall intensities and duration for specified frequencies called Intensity-Duration-Models. The second set contains 8 rainfall models which represent rainfall intensities and frequencies for specified duration called Intensity-Frequency Model. The two sets of models developed in this research recorded high and positive values of coefficient of correlation, an indication of good curve fitting with values of Intensity-Duration Models ranging from 0.948 to 0.977 and intensity frequency model ranging from 0.641 to 0.938. These set of models developed will serve as valuable tools for predicting rainfall events in Uyo City as well as for use in the design of hydraulic structures, urban drainage and flood control.

Keywords

Rainfall, Modeling, Intensity, Duration, Frequency, Least, Squares, Uyo City, IDF, Curves, Magnitude, Duration, Meteorological, Hydraulic