Development of Models for Rainfall Intensity- duration-frequency for Akure, South-west, Nigeria

Main Article Content

A. O. David
Ify L. Nwaogazie
J. C. Agunwamba

Abstract

The rainfall Intensity-Duration-Frequency (IDF) relationship is widely used for adequate estimation of rainfall intensity over a particular catchment. A 25 year daily rainfall data were collected from Nigerian Meteorological Agency (NIMET) Abuja for Akure station. Twenty five year annual maximum rainfall amounts with durations of 5, 10, 15, 20, 30, 45, 60, 90, 120, 180, 240, 300 and 420 minutes were extracted and subjected to frequency analysis using the excel solver software wizard. A total of six (6) return period specific and one (1) general IDF models were developed for return periods of 2, 5, 10, 25, 50 and 100 years using Gumbel Extreme Value Type-1 and Log Pearson Type -3 distributions. Anderson Darling goodness of fit test was used to ascertain the best fit probability distribution. The R2 values range from 0.982 to 0.985 for GEVT -1 and 0.978 to 0.989 for Log Pearson type -3 while the Mean Squared Error from 33.56 to 156.50 for GEVT -1 and 43.01 to 150.63 Log Pearson Type III distributions respectively. The probability distribution models are recommended for the prediction of rainfall intensities for Akure metropolis.

Keywords:
Akure, excel solver, IDF models, log Pearson type-3 & Gumbel extreme value type -1 distributions

Article Details

How to Cite
David, A. O., Nwaogazie, I. L., & Agunwamba, J. C. (2019). Development of Models for Rainfall Intensity- duration-frequency for Akure, South-west, Nigeria. International Journal of Environment and Climate Change, 9(8), 457-466. https://doi.org/10.9734/ijecc/2019/v9i830131
Section
Original Research Article

References

Bernard MM. Formulas for rainfall intensities of long duration. Transactions, ASCE, 96 (Paper No.1801). 1932;592624.

Hosking JRM, Wallis JR. Regional frequency analysis: An approach based on L-moments. Cambridge University Press, Cambridge, U.K.; 1997.

El-Syed EA. Generation of rainfall intensity duration frequency curves for ungauged sites. Nile Basin Water Science & Engineering Journal. 1961;4(1):112-124.

Chow VT, Maidment DR, Mays LW. Applied hydrology. McGraw-Hill International Editions, New York, USA. 2. Gupta, B.L. and Gupta, A. 2008; 1988.

Mohammad Zakwan. Application of optimization technique to estimate IDF parameters. Water and Energy International; 2016.

Ekeng BE. Effective implementation of urban storm water drains: A case study of Calabar. In Tropical Environmental Forum, Conference Proceeding in the Polytechnic Calabar, Calabar; 1998.

Hershfield DM. Estimating the probable maximum precipitation. Journal of the Hydraulic Division, Proceeding of the ASCE, HY5. 1961;99–116.

Kothyari UC, Garde RJ. Rainfall intensity duration frequency formula for India. J. Hydr. Engrg. ASCE. 1992;118(2):323-336.

Chow VT. Generalized formula for hydrologic frequency analysis. Trans. Am. Geophys. Union. 1951;32:231–237.

Nwaogazie IL, Ekwueme MC. Rainfall intensity-duration-frequency (IDF) models for Uyo city, Nigeria. International Journal of Hydrology. 2017;1(3).
DOI: 15406/ijh.2017.01.00012

Chen CL. Rainfall intensity-duration –frequency formulas. Journal of Hydraulic Engineering. ASCE. 1983;109(12):1603-1621.

Nwaogazie IL, Masi S. Probability and non-probability rainfall intensity – duration – frequency modelling for Port-Harcourt metropolis, Nigeria. International Journal of Hydrology. 2019;3(1):66-75.

Ologhadien I, Nwaogazie IL. Rainfall-intensity-duration-frequency models for selected cities in Southern Nigeria. Nigerian Journal of Technology. 2016;36(4):1296–1302.
Available:http://dx.doi.org/10.4314/njt.v36i4.40

Nwaogazie IL, Okonkwo SC. Rainfall-intensity-duration-frequency modelling and comparative analysis of developed models for Abakaliki, Ebonyi State, Nigeria. Int’l Journal of Trend Res & Dev. 2017;4(2):776-783.
Available:[email protected]

David AO, Nwaogazie IL, Agunwamba JC. Modelling rainfall intensity by optimization technique in Abeokuta, South-West, Nigeria. Journal of Engineering Research and Reports. 2019;6(4):1–10.

Sherma CW. Frequency and intensity of excessive rainfalls at Boston, Massachusetts. Am. Soc. of Civil Engrgs. 1931;95:951–960.