Systemic Management of Water Resources with Environmental and Climate Change Considerations

River basin management is very varied and challenging due to the competition in water consumption different parts. Therefore, modeling resources uses complicated, time-consuming, essential catchments with a complex hydro system. In present study, was performed for southeastern part of Aras catchment area located Iran. this area, there intense implementation policies increase cultivation need provide environmental rights, which causes lack supply some sectors. demand five sub-basins were investigated using WEAP MABIA model. Four separate scenarios, including reference scenario (S1), priority meeting demands (S2), climate scenarios (S3, S4) under general circulation models (GCMs) based on IPCC Sixth Assessment Report (AR6) produced near (2021–2040), middle (2041–2060), far (2061–2080) future periods. Scenarios S3 S4 considered policy increasing efficiency cultivated evaluate response changes demand. The simulation results S1 show that current existing requirements wet years but are insufficient dry area. Water shortage will also rise impact change, especially S4. indicated rate rights deficit three aquifers study significantly comparison S2, requires adoption appropriate achieve sustainable all subsections.