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Nwoke HU

Nwaogazie IL

Okoro BC

 

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Volume 1, Issue 3, pp. 24-27

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Full Length Research

 

Dimensional analysis in rainfall intensity modelling

(A case of selected cities in south eastern Nigeria)

 

Nwoke HU, Nwaogazie IL, and Okoro BC

 

Department of Civil Engineering, Federal University of Technology, P.M.B. 1526, Owerri, Imo State, Nigeria.

 

Accepted 22nd August, 2012

 
Abstract

 

Most models of rainfall intensity are empirical equations which are not dimensionally balanced. Talbot, Bernard and some other researchers had come up with relationships of rainfall intensity with duration which could predict very well but dimensionally, such relationships are not balanced.  This research took cognizance of this problem and applied dimensional analysis to develop models of rainfall intensity for the cities of Enugu, Owerri and Onitsha in South Eastern Nigeria.  The statistical method of regression was used to fit the data collected. These models have limitations of two-parameter models; rainfall amount and duration must be known before model can be evaluated, but the models are scientifically more acceptable because of their being dimensionally balanced.  The models also relate the field data very well.

 

Keywords: Rainfall intensity, dimensional analysis, regression.

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