Skip to main content

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

Browse the glossary using this index

Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL



Effect of an event on the system.

Impermeable surface (impervious)

Surface that resists the infiltration of water. Usually a measure of roof and road surfaces in simulation modelling.


Accepted or derived parameter which can be measured directly or determined from separate measurements, and which indicates trends in a particular referent.


The unintended ingress of ground water into a drainage system (also termed parasitary flow in some countries).


"Flow which enters the sewer; this can be generated by rainfall or an industrial discharge or other particular connection."


That which resolves uncertainty, or explicatory meaning of data

Initial conditions

Initial (or starting) values for a system under consideration.

Integrated urban flood risk management

Coordination and integration (or a sum/collection) of tools, approaches, methods and resources into the practices for the purpose of maximising benefits (or minimising flood risk) and minimising costs.


The one that uses the epistemologies/methods of one discipline within another.


The covering of a land surface by water from a drainage system whose capacity is insufficient to convey the flow.