In the Fall of 1993, I was invited to give a lecture at the São Carlos School of Engineering, of the University of São Paulo, in São Carlos, Brazil. I spoke about the effect of cross-sectional shape on channel hydraulics, a topic which I had been researching at the time with Pedro J. Porras, one of our graduate students. Some time later, we published a paper in the ASCE Journal of Hydraulic Engineering.1

As he introduced me to his students, my host, Dr. Fazal H. Chaudhry, mentioned that in his opinion, we were one of the very few to research the subject of the cross-sectional effects on the flow hydraulics. He was correct, and I was very pleased with the uncommon recognition.

1 Ponce, V. M., and P. J. Porras. 1995. Effect of cross-sectional shape on free-surface instability. ASCE Journal of Hydraulic Engineering, Vol. 121, No. 4, April, 376-380.
Rolls waves in a lateral irrigation canal, Cabana-Maņazo, Puno, Peru.

Rolls waves in a lateral irrigation canal, Cabana-Mañazo, Puno, Peru.