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Contains terms and definitions used in the reference book, the project and the structure of the Ontology.

Browse the glossary using this index

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Acceptable risk

The level of risk that can be considered acceptable for a society or community given its existing social, economic, political, cultural, technical and environmental contexts and situations.


Pertaining to an organization, an institution and a community whose actions may have influence on the formation, propagation and accumulation of risk.


The ability of a system to adjust in response to actual or changing expectations in climate or other drivers of risk.

Adaptive solutions (or measures)

Those solutions that can provide the necessary flexibility of social and technical structures in response to ever changing natural, social and technical processes.


Annual Exceedance Probability (the probability that a given total rainfall accumulated over a given duration will be exceeded in any one year (e.g., 10% AEP).


Pertaining to people, institutions, governments, technologies and other entities.

Agent based model

A class of computational models for simulating the actions and interactions of autonomous agents (both individual or collective entities such as organizations or groups) with a view to assessing their effects on the system as a whole. It combines elements of game theory, complex systems, emergence, computational sociology, multi-agent systems, and evolutionary programming.


A set of flood resilient measures (see also definition of strategy).


Average Reccurence Interval (the average, or expected, value of the periods between the exceedances of a given rainfall total accumulated over a given duration (e.g., 10-yearARI).

Asset management

A comprehensive and structured approach to the long-term management of assets to serve the needs of urban communities.