Water availability of Akelamo River, Obi Island, South Halmahera Heksantia Rahmadinda Yasya, Muhammad Sonny Abfertiawan, Tonny H. Gultom, Petrus Gunardi and Muharwan Syahroni E3S Web of Conf., 485 (2024) 03015 Published online: 02 February 2024 DOI: 10.1051/e3sconf/202448503015