Potential Analysis of Surface Water Balance in the Water District of the Kali Lamong Watershed, Indonesia

This research intends to evaluate the water availability condition and the development in the future in the water district of Kali Lamong Watershed, so the quantitative study that integrates the supply and demand at every water district is integrated from upstream until downstream, is necessary to be carried out. The methodology consists of comprehensive quantitative analysis to the water resources including the supply and demand in the water districts that have been carried out. Missed from the uncertainty that is big enough related with the development in the future, the water management nowadays and in the future can be seen from the analysis result of water balance potency that is carried out in each water district. Based on the analysis result of water balance that is carried out, there is obtained that the water balance in each water district gives the information about water surplus and deficit. Water deficit in the future is happened in the water district of Lamong Hulu, Sabeng, and Kalitemu, meanwhile the water surplus is happened in the water district of Lamong Tengah, Ngrembeng, and Lamong Hilir. The period of water deficit in the water district is very short by the small dimension. In 2100, the water deficit of Lamong Hulu water district will be about -1.024 m 3 /s, in the Sabeng water district - about -2.99 m 3 /s, and in the Kalitemu water district - about -2.128 m 3 /s. Keywords : watershed, water balance, water district, Kali Lamong. https://doi.org/10.55463/issn.1674-2974.50.9.7