Water - another global 'crisis'?

Among people who study human development, it is a widely-held view that each person needs about 20 litres of water each day for the basics - to drink, cook and wash sufficiently to avoid disease transmission.

Yet at the height of the East African drought, people were getting by on less than five litres a day - in some cases, less than one litre a day, enough for just three glasses of drinking water and nothing left over.

"The scarcity at the heart of the global water crisis is rooted in power, poverty and inequality"
UNDP, 2006

Some people, perhaps incredibly from a western vantage point, are hardy enough to survive in these conditions; but it is not a recipe for a society that is healthy and developing enough to break out of poverty.

"Obviously there are many drivers of human development," says the UN's Andrew Hudson.

"But water is the most important."

At the United Nations Development Programme (UNDP), where Dr Hudson works as principal technical advisor to the water governance programme, he calculated the contribution that various factors make to the Human Development Index, a measure of how societies are doing socially and economically.

"It was striking. I looked at access to energy, spending on health, spending on education - and by far the strongest driver of the HDI on a global scale was access to water and sanitation."

more from the BBC