In order to provide water security in the twenty-first century,
there is universal agreement that a continuation of current
policies and extrapolation of trends is not an option. Also clear
is that from both water supply and development perspectives, the
world's arid and semi-arid regions are those currently and
potentially experiencing the highest water stresses. One third of
the world's land surface is classified as arid or semi-arid, and
about half of all countries are directly affected in some way by
problems of aridity. The hydrology of arid and semi-arid areas is
also known to be substantially different from that in more humid
regions. It is therefore essential that investigation methods
appropriate to the former are developed and applied, and that
strategies for arid and semi-arid region water resources
development recognise the principal characteristics of in-situ
hydrological processes.
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