 The viceroy, Don Diego Fernández de Córdoba, Marques de Guadalcázar (1612–21), the successor of Fray García Guerra, was sent from Spain with special instructions concerning the work of the draining of the valley.At the same time Philip III commissioned the Spanish ambassador to the Court of France, Don Íñigo Contreras, to find a competent engineer for the work and the Dutchman Adrian Boot, who arrived in Mexico in 1614, was selected.At the suggestion of the viceroy, Boot with Martínez and the auditor Otalora visited the works and each made a report.