The Valsequillo Dam is the main water body of the State of Puebla, Mexico, with a surface of 300,000 hectares (740,000 acres). Due to the heavy organic loads that it was receiving, in the year of 1995 90% of its surface was covered by the water hyacinth Eichhornia Crasipes. I participated into the elaboration of its Environmental Management Plan (EMP), developing a 10 days monitoring program to study water quality in rivers Atoyac and Alseseca, its two main tributaries. Together with Mr. Adan Pando Moreno, I oversaw the monitoring program implemented by the UNAM’s Department of Limnology. I analysed data and reported results. To address the water hyacinth problem, I collaborated in the study of its biology and developed some strategies to remove it from the basin into a long-term project. This project included the upstream construction of three wastewater treatment plants (WWTP), dredging of the two rivers, the use of local trophic competitors, and manual harvesting of water hyacinth. The latter would have created employment opportunities for local deprived communities.