According to recent archaeological studies (soil analysis, in the form of carrots, by thermoluminescence), it has been able to show that the decline of the Maya was due to a combination of factors. The region of the empire, located in the tropical environment is unfortunately established on a karstic soil, therefore permeable to water, and therefore who do not retain. Outside, the Mayas were instigating treasures of engineering to retain the water, and especially to cope with a dry season of seven months. In addition, recall that the main crop is the maiuml;s. And the maiuml;s is gourmand in water.