Application of Hybrid-Ihacres models for water availability in Siak RiverManyuk Fauzi, Ermiyati, Suprasman, Siswanto, Alfian Malik, Doli Ananta Putra and Andica PutraMATEC Web Conf., 276 (2019) 04017DOI: https://doi.org/10.1051/matecconf/201927604017