**Acknowledgements**

This work was supported by Fondo de Apoyo a la Investigación (C17-FAI-06-27-27). We are also grateful to the Catedras CONACyT-UASLP project (No. 553). We appreciate the laboratory and technical support of Alan Lugo-Perez, Ana L. Piña-Cuello, Daniela E. Alviso-Reyna and Marco A. Orta-Salazar of the undergraduate environmental engineering program (project development course) of the UASLP. We also thank Laura C. Martínez-Turrubiartes and Omar Cruz-Santiago for English language editing of the chapter. Finally, we thank Angel S. González-Canuto for the elaboration of the map.
