International Science Community Association International Research Journal of Environmental Sciences 2319-1414 8 3 2019 07 22 Comparative study of some estimation methods of evapotranspiration in the tropical zone: case of the region of Pointe-Noire (Congo) 39 52 EN Singh Raj 1 Department of Environmental Science, Baba Farid Institute of Technology, Dehradun–248007, India Mishra Arun P. 2 Department of Environmental Science, Baba Farid Institute of Technology, Dehradun–248007, India Zita Flora Diamouangana Mpissi 1 Laboratoire de Chimie minérale et Appliquée, Faculté des Sciences et Techniques, Brazzaville, Congo Joseph-Marie Moutou 2 Laboratoire de Chimie minérale et Appliquée, Faculté des Sciences et Techniques, Brazzaville, Congo and Ecole Normale Supérieure University, Marien Ngouabi B. P. 69, Brazzaville, Congo Laurent Matini 3 Laboratoire de Chimie minérale et Appliquée, Faculté des Sciences et Techniques, Brazzaville, Congo and Ecole Normale Supérieure University, Marien Ngouabi B. P. 69, Brazzaville, Congo Fraîde Mongo Oladzou Michel Christ 4 Laboratoire de Chimie minérale et Appliquée, Faculté des Sciences et Techniques, Brazzaville, Congo Merline Kouhounina Banzouzi Lady 5 Laboratoire de Chimie minérale et Appliquée, Faculté des Sciences et Techniques, Brazzaville, Congo Meena Vinay Kumar 1 University Department of Civil Engineering, Rajasthan Technical University, Kota– 324010, India Choudhary Mahendra Pratap 2 University Department of Civil Engineering, Rajasthan Technical University, Kota– 324010, India Ogemdi Iwuozor Kingsley 1 Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Nigeria Chidubem Ekpunobi Emmanuel 2 Department of Microbiology, Abia State University, Abia State, Nigeria D. Jadhav Raju 1 Room No. B1/701, Saket Co-op. Hsg. Society Ltd., Saket Road, Thane (W)–400601, Maharashtra, India B. Mali Harishchandra 2 House No. 1910, Opp. Vittal Mandir, Mahatma Gandhi Nagar, Near Anandnagar, Thane (E)–400603, Maharashtra, India Ngoma Frédéric Balounta 1 Laboratory of Mechanics Energy and Engineering, Higher National Polytechnics School, Marien Ngouabi University, Brazzaville, Congo Tathy Christian 2 Laboratory of Mechanics Energy and Engineering, Higher National Polytechnics School, Marien Ngouabi University, Brazzaville, Congo and Department of Exact Sciences, Higher Teacher′s Training School, Marien Ngouabi University, Brazzaville, Congo Niere Romain Richard 3 Laboratory of Mechanics Energy and Engineering, Higher National Polytechnics School, Marien Ngouabi University, Brazzaville, Congo > Research Article 2018 10 19 2019 07 22 Sustainable management of water resources needs a perfect command of the terms of the hydrological balance among them evapotranspiration. This work deals with the comparison of some methods assessing potential evapotranspiration in the tropical zone. It is made using climatic data (temperature, rainfall, relative humidity, sunshine duration, wind speed and Piche evaporation) collected during the period 1990 to 2016 at Pointe-Noire airport in the south-west of Republic of Congo. The results show that, on the monthly scale, the values of potential evapotranspiration (ETP) obtained by the Penman-Monteith method, are closes to those obtained with the measured Piche evaporation. However, during the dry season (August-September), this method of calculation overestimates potential evapotranspiration up to 27.4%. Moreover, the application of the different approaches for estimating the annual ETP, highlights that the Penman-Monteith method, leads also to a better estimate of this climatic component. Nevertheless, this method overestimates Piche ETP in the year 1992, with a relative deviation up to 40.5%. Copyright@ International Science Community Association