With the consequent physical increase of the projects and the region that will be affected, the activity to plan and to implant the projects will take more time having the demand of that the future necessities are foreseen with enough antecedence so that they can be supplied when to occur. 2. TYPES OF DEMANDS the demands related to waters are intensified with the economic development, as much as for the increase of the amount demanded for determined use, how much with respect to variety of these uses. Originally, the water was used mainly for domestic dessedentao and other uses, agricultural creation of animals and other uses from rain and, with suppliment less frequently irrigated. In the measure that the civilization if developed other types of necessities had been appearing, disputing waters many scarce times and establishing conflicts between users. The main categories of demands of water is found inserted in three classrooms: Social infrastructure: one mentions the general demands to it of the society in which the water is a final consumer good.
Agriculture and aquicultura: one mentions the water demands to it as intermediate consumer good aiming at the creation of adjusted ambient conditions for the development of animal or vegetal species of interest for the society. Industrial: demands for activities of industrial and energy processing in which the water enters as intermediate consumer good. How much to the nature of the use three possibilities exist: Consuntivo: the uses are mentioned to it secularly that remove the water of its natural source diminishing its quantitative availabilities, space and. No-consuntivo: the uses are mentioned to it that return to the suppliment source, practically the totality of the used water, being able to have some modification in its secular standard of quantitative availability. Place: one mentions the uses to it that use to advantage the availability of water in its source without any excellent, secular or space modification, of quantitative availability.