SUSTAINABLE CLEAN WATER SUPPLY MANAGEMENT IN THE SOUTH BALI, INDONESIA

The South Bali region has a vital function for Bali Province because, as the center of education, trade, and tourism, it has a rapidly growing population. The increasing need for clean water needs to be followed by integrated and sustainable fulfillment without reducing the water supply for Subak’s traditional agricultural irrigation system. This research aims to determine the solution for a sustainable, balanced, clean water supply and demand in anticipating the future rapid population growth, decreased and unpredictable water sources, and Southern Bali as a National center of the tourism industry sector. The research method is a quantitative and qualitative approach to analyze the potential water supply and demand and provisioning designs based on future developments in the South Bali region. The results showed that the projected water demand in this area in 2025 is 5,587.22 liters/second, and in 2040 it is 7,313.10 liters/second while judging from water availability through municipal waterworks company and rural, this area only has water of 3,094.07 liters/second. Based on the analysis results, it can be conveyed that starting in 2025, this area will have a water shortage. The optimization of the extended storage of several rivers and integration of reservoirs with a total capacity of 2,380 liters/second could fulfill the sustainable water supply for Denpasar City. In addition, Badung Regency has long storage and reservoirs with a total capacity of 925 liters/second. The fulfillment of Gianyar Regency is carried out with long storage and pools with a total capacity of 670 liters/second. This result could pave the way for the local Government to manage and integrate the supply from different sources for the water requirement in 2025. While for the water supply beyond 2025, the Government needs to build and invest in new water sources.