May 28, 2021

INSTITUTO FEDERAL DE SAO PAULO
CAMPUS CARAGUATATUBA
SÃO PAULO, BRAZIL

Dear Sirs:

This letter is to certify that PROF. VASSILIKI T. GALV�O BOULOMYTIS spent the period from 23 September 2020 to 14 October 2020, working remotely as a research collaborator in my laboratory, the Visualab, at the Department of Civil, Construction, and Environmental Engineering, San Diego State University.

During the period of performance, Prof. Boulomytis completed the following assignments in an expeditious and professional manner:

1. Review of the translation, from English to Portuguese, of two (2) chapters and one (1) appendix of the textbook entitled Fundamentals of Open-channel Hydraulics.

2. Review of the translation, from English to Portuguese, of all figure captions of the textbook entitled Engineering Hydrology, Principles and Practices.

3. Collaborated in the research and writing of an article entitled "Diseño de un canal estable con fuerte pendiente utilizando el exponente de la curva de gasto", in Spanish.

Sincerely yours,

Victor M. Ponce
Professor of Civil and Environmental Engineering
Director, Visualab