11.07.2015 Views

Adapting to Climate Change: Assessing the World Bank Group ...

Adapting to Climate Change: Assessing the World Bank Group ...

Adapting to Climate Change: Assessing the World Bank Group ...

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

CHAPTER 3CLIMATE VARIABILITYBut it already represents 86 percent of human consumption of water, competing inmany places with urban consumption and environmental flows. This competition willget worse as water demand increases and, in many places, will be fur<strong>the</strong>r stressed byclimate change.Figure 3.1. The Nilometer: Tracking Five Millennia of Hydrological VariabilitySource: Hassan (1981); Eltahir and Wang (1999) Pho<strong>to</strong>: K. ChomitzNote: The column in <strong>the</strong> picture above is a river gauge: <strong>the</strong> Nilometer at Roda Island, Cairo, installed in AD 715 and incontinuous use until rendered obsolete by <strong>the</strong> operation of <strong>the</strong> Aswan dam. Because of <strong>the</strong> criticality of <strong>the</strong> Nile floods <strong>to</strong> farming,nilometers were in use for five millennia, and nearly continuous written records date <strong>to</strong> <strong>the</strong> seventh century. An excerpt of <strong>the</strong>record (lower panel) shows decades-long irregular cycles. His<strong>to</strong>rical data have been shown <strong>to</strong> be strongly correlated with globalclimate patterns.32

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!