1. Senior Researcher, Center for Development Research, Bonn Univ., Walter-Flex-St. 3, 53113 Bonn, Germany; formerly, Postdoctoral Researcher, International Water Management Institute, 125 Sunil Mawatha, Pelawatte, Battaramulla 10106, Sri Lanka (corresponding author).
2. Researcher, International Water Management Institute, 125 Sunil Mawatha, Pelawatte, Battaramulla 10106, Sri Lanka.
3. Research Assistant, Sanford School of Public Policy, Duke Univ., Rubenstein Hall, Rh 188, Durham, NC 27708.
4. Assistant Professor, Sanford School of Public Policy, Duke Univ., Rubenstein Hall, Rh 188, Durham, NC 27708; Adjunct Senior Research Fellow, Institute of Water Policy, National Univ. of Singapore, Singapore.