During the construction of dams problems in the dynamic hydrossedimentometric and storage level should be considered, because it directly affects the useful life of the reservoir. This study evaluated three hydrossedimentometric scenarios in the Basin of Araguari River under impact of future reservoir Hydroelectric Plant Cachoeira Caldeirao (UHECC). Scenario 1 considered the maintenance of the present conditions of use and occupation of the watershed, with a low sediment load (2,01.108 kg / year). Scenario 2 considered an increase of 0.7% to 3% per year in hydrossedimentometric production rate. And in the third scenario, the solid discharge was increased by 30 times compared to the first one. The three scenarios were analyzed from the strategic vision of the dynamics of the use and occupation of land in the basin (IEPA/ZEE, 2008). The Borland and Miller equations were used to assess the level of sedimentation and Lara and Pemberton to calculate the apparent specific gravity of the loads ( g ap ). Scenario 1 indicated the maintenance of the current conditions of conservation of the basin, low level of sedimentation of the reservoir in the next 200 years. In scenario 2 the changes become relevant from the next 100 years. In scenario 3 the deterioration of the useful level of the reservoir begins to occur in just 50 years, with a loss of 67% of its initial volume. We concluded that future hydrossedimentometric dynamics will depend on the environmental services provided by conservation areas and surrounding upstream UHECC to ensure the current hydrossedimentometric quality in the basin. Keywords : watershed; sedimentation; environmental modeling; vulnerability. During the construction of dams problems in the dynamic hydrossedimentometric and storage level should be considered, because it directly affects the useful life of the reservoir. This study evaluated three hydrossedimentometric scenarios in the Basin of Araguari River under impact of future reservoir Hydroelectric Plant Cachoeira Caldeirao (UHECC). Scenario 1 considered the maintenance of the present conditions of use and occupation of the watershed, with a low sediment load (2,01.108 kg / year). Scenario 2 considered an increase of 0.7% to 3% per year in hydrossedimentometric production rate. And in the third scenario, the solid discharge was increased by 30 times compared to the first one. The three scenarios were analyzed from the strategic vision of the dynamics of the use and occupation of land in the basin (IEPA/ZEE, 2008). The Borland and Miller equations were used to assess the level of sedimentation and Lara and Pemberton to calculate the apparent specific gravity of the loads ( g ap ). Scenario 1 indicated the maintenance of the current conditions of conservation of the basin, low level of sedimentation of the reservoir in the next 200 years. In scenario 2 the changes become relevant from the next 100 years. In scenario 3 the deterioration of the useful level of the reservoir begins to occur in just 50 years, with a loss of 67% of its initial volume. We concluded that future hydrossedimentometric dynamics will depend on the environmental services provided by conservation areas and surrounding upstream UHECC to ensure the current hydrossedimentometric quality in the basin. Keywords : watershed, sedimentation, environmental modeling, vulnerability.