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ISSN: 2168-9768

Irrigation & Drainage Systems Engineering
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  • Research Article   
  • Irrigat Drainage Sys Eng 2017, Vol 6(3): 196
  • DOI: 10.4172/2168-9768.1000196

Validation of Valiantzas Reference Evapotranspiration Equation under Different Climatic Conditions

Djaman K1*, Koudahe K2, Allen S1, O’Neill M1 and Irmak S3
1Department of Plant and Environmental Sciences, New Mexico State University, Agricultural Science Center at Farmington, Farmington, USA
2Direction des Filières Végétales (DFV), , MAEH, Lomé, Togo
3Department of Biological Systems Engineering, University of Nebraska, Lincoln, Nebraska, USA
*Corresponding Author : Djaman K, Department of Plant and Environmental Sciences, New Mexico State University, Agricultural Science Center At Farmington, P.O. Box 1018, Farmington, USA, Tel: 505-960-7757/7758, Fax: 5053255246, Email: [email protected]

Received Date: Dec 01, 2017 / Accepted Date: Dec 13, 2017 / Published Date: Dec 23, 2017

Abstract

Numerous daily reference evapotranspiration (ETo) equations were developed for different climatic conditions with different performance even within the same climatic region. Their calibration and validation to the local climate usually increase their performance. The objective of this study was to evaluate Valiantzas’ daily grass ETo equation with comparison to Penman-Monteith equation at 61 weather stations across 10 countries in Africa for the period of 1980-2012. The results showed good performance of Valiantzas’ ETo equation with very low RMSE varying from 0.03 to 0.27 mm/day, low percent error PE from 0.87 to 5.46%, MBE from -0.09 to 0.23 mm/day and MAE from 0.03 to 0.23 mm/day. For the pooled data set, RMSE averaged 0.10 mm/day, mean PE was 1.95%, mean MBE was 0.02 mm/day and the mean MAE was 0.08 mm/day. These indexes indicated the very high performance of the Valiantzas’ ETo equation compared to the Penman-Monteith equation and its adaptation to very broad conditions from humid to semiarid climates. *

Keywords: Reference evapotranspiration; Penman-Monteith; Valiantzas; Different climatic conditions

Citation: Djaman K, Koudahe K, Allen S, O’Neill M, Irmak S (2017) Validation of Valiantzas’ Reference Evapotranspiration Equation under Different Climatic Conditions. Irrigat Drainage Sys Eng 6: 196. Doi: 10.4172/2168-9768.1000196

Copyright: © 2017 Djaman K, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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