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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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Condition referring to the potential of the hydro-meteorological phenomena to cause harm to humans and objects.

Hazard zoning

Delineation of areas with different possibilities and limitations for investments and development, based on flood hazard.


A view or an understanding in terms of interrelated wholes whose properties cannot be understood in isolation.

Holistic approach

An approach which recognises the breadth of interactions and interdependences between different processes and activities and it adds the perception of how flood resilience measures are embedded in much wider natural and social environments. It goes beyond the traditional integrated view as it emphasises the importance of tending to relationships, interactions and interdependences between different processes and activities (which may relate to nature, society and technology).

Hydraulic analysis

Assessment of the hydraulic behaviour of a system. Simulation hydraulic modelling of a sewerage network to determine its performance.

Hydraulic capacity

Maximum flow a pipe of given dimensions, slope and roughness can carry (often quoted as pipe-full capacity which is a little less than the maximum capacity).

Hydraulic performance

The measure of the capacity of the system or part thereof.


A graph showing, for a given point on a stream or conduit, the discharge, stage, velocity, available power, or other property of water with respect to time.


A discipline that integrates knowledges from the social and technical domains to create so-called conjunctive knowledges, that are concerned with an understanding of how technical interventions have social consequences and how the resulting social changes in turn generate new technical developments. It has also been defined as a discipline concerned with “creation of sociotechnical environments in which the transmutations necessary to provide states of social justice can be catalysed through the creation of appropriate sociotechnologies.

Hydroinformatics environments

Virtual environments which use DSS and DST technologies together with dynamic, highly-detailed and relevant illustrations and animations, of the objects that are of the greatest concern to the individual stakeholders and to the society as a whole.