Vol. 10, Special Issue 10 (2021)

Author(s):
A Archana, M Radha, GA Dheebakaran and G Vanitha

Abstract:
Potential evapotranspiration is important in the ecological, hydrological, and drought assessment processes, as well as agricultural production and irrigation management. It is an important source of moisture returned to the atmosphere. To estimate weekly PET (potential evapotranspiration) for Coimbatore in 2019, the FAO Penman-Monteith, Modified Penman, Penman, Priestley Taylor, Blaney Criddle, and Hargreaves models were utilized in this study. The Penman model was shown to be the most relevant, with the least bias and the highest R² (Coefficient of determination). Multiple Linear Regression was used to create the models, and Root Mean Squared Error, and coefficient of determination (R²) were used to compare their performance. Priestley Taylor's model was chosen as the most practical, with the least bias and the highest R². Predict the PET for 2020 based on the findings of this study.