Sustentabilidade e valoração dos recursos hídricos da bacia do rio Moju.

Abstract

Water has multiple uses essential for human development, functioning of ecosystems and maintenance of society. Watersheds, as a management tool, need to be evaluated in terms of their sustainability for their maintenance and / or revitalization, so that they can provide water at quali-quantitative levels acceptable to human and animal consumption. The objective of this research was to discuss the water sustainability of the Moju river basin (PA), evaluating the criteria necessary to assess its water resources considering the hydrological parameters associated with water availability, environmental cover, social and management parameters related to capacity of the basin. The proposed method was structured according to: identification of the main pressures exerted in the Moju river basin (PA) by the forms of land use; Adoption of the WSI - Water Sustainability Index as an indicator that represents the sustainability of the river basins, as well as the interrelation between the pressures in the system and the management responses; And definition of criteria that allow the correct valorization of the water resources, necessary for the basin to develop an internal process of management and revitalization. As a result, by zoning the areas of greatest pressure on natural resources (water and soil), it can be seen that the Upper Moju is the most sub-basin under pressure. Regarding the application of the WSI and the PSA model, the sustainability of the basin is compromised because there is an imbalance in the various variables adopted, as well as the stability of the system. The necessary answers are all linked to the issue of water resources management, because in hydrological terms it is observed that the region has potential that allows in the Q70 in the least rainy period, flow conditions in the main course of the Mojuriver.