Since the rises in food prices in 2008 and beyond, food security is high on the development agenda. Recognizing that water is an essential element to achieve food security goals, several high level events this year put 'water and food security' as their main theme.

Conventional blue water scarcity indicators suffer from four weaknesses: they measure water withdrawal instead of consumptive water use, they compare water use with actual runoff rather than natural (undepleted) runoff, they ignore environmental flow requirements and they evaluate scarcity on an annual rather than a monthly time scale.