PRET Download Site

Please fill out the following form and “Submit” before downloading PRET and associated documentation.

The program and user’s manual can be downloaded by clicking on the following hyperlinks:

Download PR-ET Computer Program (Version 1.03)*
History of program updates
Installation Instructions
Download PR-ET User’s Manual *

The technical basis of PR-ET can be found in the following articles:
Harmsen, E. W., M. R. Goyal, and S. Torres Justiniano, 2002. Estimating Evapotranspiration in Puerto Rico. J. Agric. Univ. P.R. 86(1-2):35-54.

Harmsen, E. W. and A. Gonzaléz, 2005. Technical Note: A Computer Program for Estimating Crop Evapotranspiration in Puerto Rico, J. Agric. Univ. P.R. 89(1-2):107-113.

Note 1. PR-ET is undergoing continual improvements and therefore, you should periodically check this website for updates. If you would like to be informed of updates as they become available, send your email address to

Note 2. If you want to use the Help command in the PR-ET program, you will have to download the User’s Manual and save it in the same director as the PR-ET.exe file.

Note 3. PR-ET and User’s Manual are provided as is without warranty of any kind, express or implied. Users bear all risk relating to quality and performance or fitness for a particular use.

DISCLAIMER: The information is provided “as is”. The authors and publishers of this information disclaim any loss or liability, either directly or indirectly as a consequence of applying the information provided herein, or in regard to the use and application of said information. No guarantee is given, either expressed or implied, in regard to the accuracy, or acceptability of the information.


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