Is there any research/studies on economic valuation of ecosystem services of human made wetlands (e.g. for a reservoir) which is also a Ramsar site? Site may be Ramsar designate and the reservoir purposely built for irrigation.
I am not sure if they chose Ramsar sites but may be you can find some info in this paper if you don't already have it: Values of natural and human-made wetlands: A meta-analysis. Andrea Ghermandi, Jeroen C. J. M. van den Bergh, Luke M. Brander,
Economic valuation of wetlands have been thoroughly studied at Central Inland Fisheries Research Institute, Barrackpore ,India, You may please contact the institute for literature.