GIS-Based Prediction and Comparative Analysis of Potential Evapotranspiration using Selected Methods at Omi-Kampe Watershed, Nigeri
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Date
2022-03
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Abstract
The study predicted potential evapo-transpiration (PET) of Omi Kampe watershed upstream in Kogi State, Nigeria using Soil and
Water Assessment Tool (SWAT) based on Priestley Taylor, Penman Monteith and Hargreaves methods. The model input data used
were Digital Elevation Model, Soil map, Land use map and 30-year temporal weather data (January 1987- December 2016) for the
simulation of the hydrological processes. The results showed that Penman Monteith and Hargreaves methods exhibited high
correlation in the predicted values of PET while Priestley Taylor results for PET are least correlated with the other two methods and
suspected to have under predicted PET values. On the other hand, all the three methods predicted the actual evapo-transpiration of
the watershed with insignificant result variations. Outcome of this research could serve as a guide to water professionals and other
stakeholders in selecting appropriate methods for evaluation of PET in the study area and sub region in Nigeria.