This proceedings contains the papers which were presented at the NATO
Advanced Research Workshop (ARW) on Extreme Hydrological Events: New
Concepts for Security, which was held in Novosibirsk, Russia, from July
11-15, 2005. The workshop fell within the NATO priority research topic
on Environmental Security, Disaster Forecast and Prevention. At the
present time, the necessity of considerable deepening of our
understanding about the nature of extreme and catastrophic natural and
man-induced events, in particular hydrologic ones, becomes very topical,
as well as the development of advanced methods for their prediction,
including estimating probability of their occurrence and a risk related
to them. Another aspect of this hydrological problem is reducing of
vulnerability of social, economic, and engineering systems to the
extreme hydrologic events (EHE) and decreasing of a degree of their
effect on such systems. Dealing with these problems needs further
refining existing tools for prediction and forecasting of EHE. It can be
done essentially through revealing mechanisms of their generation and
with use of new approaches and methodologies in related branches of
hydrology. This ARW is targeted to contribute to the critical analysis
and assessment of current knowledge on a number of the key issues of
hydrology, such as: extreme hydrological phenomena, problems of floods,
low flows and droughts. In view of significant economic losses and
actually wide geographical occurrence, investigation of these
hydrological phenomena is of great scientific and practical importance.