ESTIMATION AND COMPARISON OF REFERENCE EVAPOTRANSPIRATION WITHIN KADUNA CENTRAL DISTRICT, NIGERIA, USING FOUR DIFFERENT METHODS

Authors

  • NE Onwuegbunam DEPARTMENT OF BASIC SCIENCE AND GENERAL STUDIES, FORESTRY RESEARCH INSTITUTE OF NIGERIA, FEDERAL COLLEGE OF FORESTRY MECHANIZATION, AFAKA, KADUNA, KADUNA STATE, NIGERIA
  • DO Onwuegbunam DEPARTMENT OF AGRICULTURAL & BIO-ENVIRONMENTAL ENGINEERING, FEDERAL COLLEGE OF FORESTRY MECHANIZATION, AFAKA, KADUNA, NIGERIA
  • A Dare DEPARTMENT OF AGRICULTURAL & BIO-ENVIRONMENTAL ENGINEERING, FEDERAL COLLEGE OF FORESTRY MECHANIZATION, AFAKA, KADUNA, NIGERIA

Keywords:

Estimation and comparison, Reference evapotranspiration, Methods, Kaduna Central District, Nigeria.

Abstract

The reference evapotranspiration (ETo) within Kaduna Central District, Nigeria was estimated from a 30-year climatological data using four different methods namely, Penman-Monteith (PM), Blaney Criddle (BC), Hargreaves (HGRV) and Piche evaporimeter (PiEv) (atmometer) methods. The study shows that the highest ETo values obtained from PM, BC and PiEv were 6.43 mm/day, 7.58 mm/day and 8.63 mm/day, respectively, and these occurred in February, except for HGRV which estimated its highest ETo (3.73 mm/day) in March. The lowest ETo values were obtained in August for all the methods.  By means of the confidence index (c), agreement or concordance index (d) and correlation coefficients (r) statistics the BC, HGRV and PiEv ETo values were correlated with that of PM, as the standard. Results showed that BC, HGRV and PiEv gave c-values of 0.88, 0.48 and 0.67, respectively.  Hence, BC-PM, HGRV-PM and PiEv-PM correlations were adjudged as excellent, bad and good, respectively, on the basis of criteria for interpretation of the performance of methods of ETo estimations. Blaney-Criddle reference evapotranspiration method gave the best estimate in comparison to the Penman-Monteith standard in the study area. Hence, the Blaney-Criddle ETo can be calibrated with the Penman-Monteith ETo and used effectively within the Kaduna Central District conditions for irrigation water management decisions.

 

http://dx.doi.org/10.4314/njt.v39i1.34

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Published

2020-01-04

Issue

Vol. 39 No. 1 (2020): NIGERIAN JOURNAL OF TECHNOLOGY, VOL. 39, NO. 1, JANUARY 2020

Section

Agricultural, Bioresources, Biomedical, Food, Environmental & Water Resources Engineering

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How to Cite

ESTIMATION AND COMPARISON OF REFERENCE EVAPOTRANSPIRATION WITHIN KADUNA CENTRAL DISTRICT, NIGERIA, USING FOUR DIFFERENT METHODS. (2020). Nigerian Journal of Technology, 39(1), 306-314. https://nijotech.com/index.php/nijotech/article/view/2250