Análise multicritério espacial no gerenciamento dos recursos hídricos no perímetro irrigado de Sumé-PB.

Abstract

Water Scarcity disrupts an economic and social development for the whole Brazilian semi-arid region. In order to minimize this problem, suitable decision-making tools can be used for helping on agriculture and climate change adaptations in irrigated crop areas. In the National Department of Works Against Drought (DNOCS) irrigated areas, it becomes a challenge the water management by the irregular proportionality among offer and demand, compounded by a bad water use planning. In this sense, this dissertation proposes an integrated use of (Analytic Hierarchy Process) AHP and (Geographic Information System) GIS tools for helping an integrated water management in Sumé-PB area. Through a qualitative and quantitative analysis, it shows that the surface water source has a better water quality (microbiological and chemical). It also shows for irrigating the whole area it will be necessary at least two different water sources (as surface water and groundwater as well). The spatial multicriteria modeling comes up the water quality as the most restrictive criteria. It can be proofed by the suitability ranges obtained by the alternatives suggested on the spatial modeling. The waste water revealed a low quality comparing with the groundwater and surface water. Using similar weights for hierarchical analysis of all criterion (technical, economic and environmental), the model shows a wide “no suitability” range for waste water sources (reuse). Based on the generated alternatives for surface and groundwater, a scenario was simulated to an integrated water resources management of the crops areas. Results are approximately 118 hectares recommended by the model to be irrigated by surface water, 112 hectares by groundwater and 58 hectares are not appropriate to use any water resources.