QUALITY OF WATER IRRIGATION FOR RICE FIELDS IN SUBAK YEHEMBANG, JEMBRANA DISTRICT, BALI

Subak is the cultural heritage of Bali in the form of an irrigation system that regulates the distribution of water management based on the mindset of harmony and togetherness based on formal and non-formal rules and religious values, arranged properly and flexibly on this subak system in Bali . Subak Yehembang is a subak in Jembrana Regency which was established in 1919 with an area of ​​414,416 hectares that still adheres to the Tri Hita Karana concept which is fortified with strong awig awig (Regulations) that govern the fields based on Religion. This research was conducted in the irrigation waters of Subak Yehembang taken at 4 location points, namely primary channel (SP), secondary channel (SK) tertiary channel (ST) and estuary channel (SIM). Water sampling is carried out twice, namely in the rainy and dry seasons with the same method and location so that the number of samples taken is 8 samples. The sampling technique is done by Purposive Sampling, the Analysis Method is done in two ways namely in-situ and the Laboratory is analyzed at the Analytical and Microbiology Laboratory of Udayana University. The level of feasibility of the results is matched with Class 1 Water Quality Standards based on Pergub Bali No. 16 of 2016, whereas the status of water quality is determined by the Storet Method based on the Decree of the Minister of Environment No. 115 of 2003. The results of the study concluded that the quality of waters of the Subak Yehembang Irrigation Water in the rainy and dry seasons there were 3 parameters namely DO, BOD5, and Coliform Bacteria leveling the first grade water quality standards. The results of the analysis of the status of the waters showed that the waters of the Subak Yehembang Irrigation Water during the rainy and dry seasons were all at 4 points classified as being moderately polluted

Keywords: Irrigation water, water quality, Water quality status. Subak