This document introduces the ETo calculator, which is a calculator for calculating reference surface evapotranspiration. The document describes the functions and usage of the calculator.
The document is a user guide for the ETo Calculator, Version 3.1, developed by the Food and Agriculture Organization of the United Nations (FAO). It details how to calculate reference evapotranspiration (ETo) from a reference surface using climatic parameters such as radiation, temperature, humidity, and wind speed.
The manual covers the software's menu structure, database management for creating and selecting station files, importing data from various text formats (including FAO Clim 2.0 and CLIMWAT 2.0), and performing ETo calculations based on the FAO Penman-Monteith method.
| Software Version | 3.1 |
|---|---|
| Release Date | January, 2009 |
The FAO Penman-Monteith method is recommended as the standard method.
Station characteristics use .DSC files, while meteorological data uses .DTA files.
The calculator supports importing monthly data exported from FAO Clim 2.0 and CLIMWAT 2.0.