CHARACTERIZATION AND DISAGGREGATION OF DAILY RAINFALL DATA OF ONITSHA, ANAMBRA STATE, NIGERIA.

Authors

  • G. I. Ezenne Department of Agric. & Bioresources Engineering, University of Nigeria, Nsukka. Author
  • H. J. Ugwuozor Department of Agric. & Bioresources Engineering, University of Nigeria, Nsukka. Author
  • C. C. Mbajiorgu Department of Agric. & Bioresources Engineering, University of Nigeria, Nsukka. Author

Abstract

Characterization and disaggregation of rainfall data is very important for locations where the existing
rainfall data is scanty. This study characterizes and disaggregates the rainfall data of Onitsha, Anambra
state, Nigeria, using simple mathematical and statistical models; especially the WMO guideline. The
disaggregation process was carried out over a time series below 6hours for as small as 30 minutes to 10
seconds. Analysis of the rainfall characteristics of Onitsha showed a maximum intensity of 146.5mm/day
occurring in March. Highest probability of dryness of 0.98 was observed in January and December.
Maximum mean daily rainfall of 14.81mm and 14.51mm occurred in September and July respectively.
Disaggregated results obtained with WMO guideline was compared with that of USDA SCS Generalized
Accumulated rainfall curves. Both the curves derived from the WMO model and three USDA SCS
Generalized Accumulated rainfall curves (A, B and C) increased together in a positive correlation but the
maximum intensity is usually reached in the middle of the storm duration in the tool.

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Published

2025-05-10

Issue

Vol. 22 No. 2 (2014): JOURNAL OF AGRICULTURAL ENGINEERING AND TECHNOLOGY (JAET)

Section

Articles