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Water is
a substance unable to be substituted in supporting all the life activities.
The water resources nrc eric of th{' riles[ vital natural resources ()il
the earth and Ihey are indis pensable tither for human life productive
activities, or for maintaining the survival environmnt on which pool]IC
rely for existence, The water resources on th( earth inhere their special
regularites as global circulation, renewal abilities, and their specific
spatial and temporal distributions. Under certain conditions water may
also hring on disasters to people. To probe deeply into tbe essence of
the law of variation of water resources with the purpose of adaptation
and remaking of the water environment is very essential for human survival
and sustainable development, lis accordance with the coBlintl(d progress
of the human society and thc pOl/ulalion growth the SCOl)e and range in
water resources &dvelopment. utilization and harnessing will steadily increase. contradiction
may still be initiat~d itl the coursr of remaking water environment. In total
due to successive enlargement of the water demand from society and the
restriction of available water resources given by the natural world, either
in China or in some other countries in the world water resources have
become more and more essential constraint for the development of national
economy and social development. Tbereforc. bow to maintain Ih(' sustainable
development of the water resources and to bring them into play for economic,
social and ecological henefils, and to mitigate as mnuch as possible the
losses from flood and drought disasters, are of vital importance to the
present and long tern0, benefits of the humanity. กก
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