Abstract
The study uses the water stress index (WSI) as a tool to assess water scarcity. Water for the ecosystem is also referred to as the amount of water required by the basin. The MIKE SHE hydrological model is used to simulate the flow in the period 1980–2020 and forecast 2030. The study also found the importance of distinguishing groundwater from surface water when calculating. 1) There is a difference in WSI between the sub-basins, according to the results. Water scarcity is more severe in the downstream regions than it is in the middle and upstream regions, particularly in the region that supplies water to Da Nang city. 2) The bulk of WSI values between March and May 2020 were higher than 0.6, with a severe scarcity WSI peak of more than 3.4. According to the low emission scenario B1, the summer rainfall changes in the Quang Nam - Da Nang region will fall by roughly 1.9% -2.1% in 2030, increasing the likelihood of more severe and extreme droughts. The WSI will also rise by twice as much as it did in 2020. Water shortages will start sooner and stay longer in 2030, starting in February and continuing through September.
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