This paper applies the principles of water-use accounts, to the Karkheh River basin in Iran.

The northern part of the Basin where the Karkheh and its tributaries rise is mountainous, cooler, and wetter. The River spills out on to the hotter, lower semi-arid plains at its southern end. Precipitation, mainly in winter, varies from 400-500 mm in the upper part of the Basin falling to about 230 mm in the lower reaches.

Wetlands occur extensively across the Nile Basin and support the livelihoods ofmillions of people. Despite their importance, there are big gaps in the knowledge about the current status of these ecosystems, and how populations in the Nile use them. A better understanding is needed on the ecosystem services provided by the difl:erent types of wetlands in the Nile, and how these contribute to local livelihoods.

This interactive poster was presented at the 2013 Stockholm World Water Week. It describes the results of a 'public good game' carried out with farmers in the polder zones of coastal Bangladesh in order to understand determinants of contributions to maintain a public good.