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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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An overwhelming flow of water onto land that is normally dry and which under certain circumstances can cause unprecedented losses and devastation.

Flow simulation

Modelling of flows in drain or sewer systems.

Flow survey (sewers)

Collection of data on the hydraulic behaviour of the network at a series of selected pints over a period of up to several weeks. Ultrasonic flow gauges are usually used. Rain gauges are also used if flow response to rainfall is being collected.


Geographic information system (GIS)

A mapping system to analyse and display geographically referenced information.

Green Cities Initiative

An initiative undertaken by Asian Development Bank (ADB), which represents a holistic way of thinking, and which is concerned with how to design the whole city in a way that is more sustainable, efficient, adaptive, and resilient.

Green Infrastructure (GI)

A network providing the “ingredients” for solving urban and climatic challenges by building with nature. It is also referred to as Blue-green infrastructure.


Water present in the sub-surface strata.


Structure to permit the entry of surface runoff into the sewer system. It is often fitted with a grating and a grit trap.



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.

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