5:15 PM - 6:45 PM
[AHW21-P03] Water Supply-Demand Evaluation Using Swat and Weap Models in Srepok River Basin, Vietnam
Keywords:SWAT-WEAP model, unmet water demand, Srepok River Basin
The Srepok River Basin (SRB) is not only one of the most crucial areas for agricultural development, but it also plays an indispensable role in water usage in Central Highland Vietnam and the downstream parts of the Mekong River Basin. Because of the geographical location in the monsoon climate and the presence of fertile red basalt soil, these conditions make the SRB ideal for growing perennial crops such as coffee, pepper, cashews, and fruit. However, despite the perception that it has an abundance of water resources, ineffective management in the SRB has led to increased incidences of water shortages during the dry season, which is the time for crop irrigation. To address this issue, the SWAT model was utilized to simulate the water balance components and the WEAP model was employed to assess the water supply-demand in the SRB. This combination of the SWAT and WEAP aims to mitigate the limitations of the individual models and provide strong support for integrated water resource management. The results of the study indicated that water shortages were more noticeable in the middle of the SRB during the period of 2006 – 2019, with serious water competition among various water usage (irrigation, domestic, livestock, and industry) occurring in 2012, 2015, and 2018. Additionally, the unmet demand for coffee irrigation was the highest in comparison with other demand sources. In the seasonal analysis, the unmet water demand volume of around 10 MCM was recorded in the second half of the dry season (February and March). These findings will provide useful information for water resource management to promote more effective and efficient water usage in SRB.