Journal of Geography and Regional Planning
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Article Number - 057FE3964815


Vol.10(7), pp. 186-196 , July 2017
DOI: 10.5897/JGRP2016.0603
ISSN: 2070-1845



Full Length Research Paper

Analysis of trends in rainfall and water balance characteristics of Awka, Nigeria



Chukwudi P. Nzoiwu
  • Chukwudi P. Nzoiwu
  • Department of Geography and Meteorology, Nnamdi Azikiwe University, Awka, Anambra State, Nigeria.
  • Google Scholar
Emma E. Ezenwaji
  • Emma E. Ezenwaji
  • Department of Geography and Meteorology, Nnamdi Azikiwe University, Awka, Anambra State, Nigeria.
  • Google Scholar
Ifeanyi C. Enete
  • Ifeanyi C. Enete
  • Department of Geography and Meteorology, Nnamdi Azikiwe University, Awka, Anambra State, Nigeria.
  • Google Scholar
Nwabueze I. Igu
  • Nwabueze I. Igu
  • Department of Geography and Meteorology, Nnamdi Azikiwe University, Awka, Anambra State, Nigeria.
  • Google Scholar







 Received: 15 October 2016  Accepted: 30 November 2016  Published: 31 July 2017

Copyright © 2017 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


This paper analyses the trend in rainfall and water balance characteristics of Awka, Nigeria using the monthly rainfall data retrieved from the archives of the Nigeria Meteorological Agency in Lagos from 1976 to 2015. The tools employed for the study are linear regression analysis, cumulative sum (CUSUM) technique, Walter’s cumulative index analysis and Thornthwaite’s method. Rainfall was observed to have declined and generally below the climatological mean in the first decade, while from1988 to early 2000s, rainfall has maintained a steady rise. The length of rainy season has shown significant number of variations, but has recorded a general increase. The rainfall onset and cessation periods were predominantly March/April and October, respectively though significant changes in onset periods has been evident in the last 10 years with 6 out of the 10 having onset occurring in February. This study observed a reduction by one month in the periods of soil moisture utilization and increase by the same amount in the periods of soil moisture recharge. As a consequence, amount of water surplus has increased.  However, this study provides explanation on the current state of rainfall in relation to climatic water budgeting for Awka and as such important for agricultural and water resource planning.

 

Key words: Cumulative sum technique, water balance components, Walter’s cumulative index analysis, Thornthwaite’s method.

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APA Nzoiwu, C. P., Ezenwaji, E. E., Enete, I. C., & Igu, N. I. (2017). Analysis of trends in rainfall and water balance characteristics of Awka, Nigeria. Journal of Geography and Regional Planning, 10(7), 186-196.
Chicago Chukwudi P. Nzoiwu, Emma E. Ezenwaji, Ifeanyi C. Enete and Nwabueze I. Igu. "Analysis of trends in rainfall and water balance characteristics of Awka, Nigeria." Journal of Geography and Regional Planning 10, no. 7 (2017): 186-196.
MLA Chukwudi P. Nzoiwu, et al. "Analysis of trends in rainfall and water balance characteristics of Awka, Nigeria." Journal of Geography and Regional Planning 10.7 (2017): 186-196.
   
DOI 10.5897/JGRP2016.0603
URL http://academicjournals.org/journal/JGRP/article-abstract/057FE3964815

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