UNESCO has set up a portal providing open access to its publications:
http://en.unesco.org/open-access/search_unesdoc
Here are some of the UNESCO publications on water:
— Carbon and water footprints: concepts, methodologies and policy responses
http://unesdoc.unesco.org/images/0021/002171/217181e.pdf
— Water and sustainability: a review of target, tools and regional cases
http://unesdoc.unesco.org/images/0021/002171/217180e.pdf
— Green accounting and data improvement for water resources
http://unesdoc.unesco.org/images/0021/002171/217165e.pdf
— United Nations world water development report 4: managing water under uncertainty and risk
http://unesdoc.unesco.org/images/0021/002156/215644e.pdf
— Groundwater and global change: trends, opportunities and challenges
http://unesdoc.unesco.org/images/0021/002154/215496e.pdf
— Global water futures 2050: five stylized scenarios
http://unesdoc.unesco.org/images/0021/002153/215380e.pdf
— Global water futures 2050: driving forces 2011-2050
http://unesdoc.unesco.org/images/0021/002153/215377e.pdf
— Water and climate dialogue: adapting to climate change
http://unesdoc.unesco.org/images/0021/002115/211591e.pdf
the anthropo.scene 
Reblogged this on The Turning Spiral and commented:
Great resource here posted by Jeremy Schmidt