1. Researcher, Hydrology and Quantitative Water Management Group, Wageningen Univ., 6708PB Wageningen, Netherlands; and Research Centre for Limnology, Indonesian Institute of Sciences, 16911 Cibinong, Indonesia (corresponding author).
2. Associate Professor, Hydrology and Quantitative Water Management Group, Wageningen Univ., 6708PB Wageningen, Netherlands.
3. Researcher, Hydrology and Quantitative Water Management Group, Wageningen Univ., 6708PB Wageningen, Netherlands.
4. Assistant Professor, Hydrology and Quantitative Water Management Group, Wageningen Univ., 6708PB Wageningen, Netherlands.