Glossary of Drainage Terms

This glossary is generated automatically. It displays the first paragraph of every page with the tags "definitions" & "drainage". If you believe you have a better definition than the one given, please click on the link and edit the page it points to. If you would like to add a new term to the glossary create the page and add the tags "definitions" & "drainage" to it. Click here for a list of other subject specific glossaries. Acronyms are listed separately.

Minor Culvert

by Wayne EddyWayne Eddy 30 Jul 2009 01:26

A minor culvert is a relatively small road culvert or number of small culverts laid side by side. The difference between a minor culvert and a major culvert is its span. In a number of Australian states culverts are considered to be minor if they span less than 6 metres.

Mitre Drain

by Wayne EddyWayne Eddy 27 Oct 2010 05:47

A mitre drain (also offshoot drain) is an open drain designed to divert runoff from a table drain or road shoulder away from a road.

Offshoot Drain

by Wayne EddyWayne Eddy 27 Oct 2010 23:11

"offshoot drain" is an alternate name for a mitre drain, i.e. an open drain designed to divert runoff from a table drain or road shoulder away from a road.

Open GPT

by Wayne EddyWayne Eddy 31 Jul 2009 01:40

An Open GPT is a Gross Pollutant Trap consisting of a combined sediment basin and trash rack usually located at the downstream end of a stormwater pipe or a constructed drainage channel.

Overland Flow Path

by Wayne EddyWayne Eddy 07 Jul 2010 12:36

An overland flow path is an above-ground component of a drainage system that caters for overland flows that occur when underground drainage pipes reach their capacity and cannot cope with more run-off from heavy rainfall. Overland flow paths can be low-lying natural drainage paths, open space floodway channels, road reserves, pavement expanses or any other flow paths that can convey flows when the Minor Drainage System reaches capacity.

Pluvial Flooding

by DDanielssonDDanielsson 13 Dec 2012 00:15

Pluvial Flooding is the result of localised heavy rain generating surface runoff that exceeds the capacity of the stormwater system.

Probable Maximum Flood

by DDanielssonDDanielsson 11 Dec 2012 22:10

Probable Maximum Flood (PMF), is the flood resulting from Probable Maximum Precipitation (PMP), including catchment conditions that are conducive to generating floods.

Rain Garden

by Wayne EddyWayne Eddy 06 Jan 2010 23:57

A rain garden is a planted depression that allows rainwater runoff from impervious urban areas like roofs, driveways, walkways, and compacted lawn areas the opportunity to be absorbed. This reduces rain runoff by allowing stormwater to soak into the ground (as opposed to flowing into storm drains and surface waters which causes erosion, water pollution, flooding, and diminished groundwater). Rain gardens can cut down on the amount of pollution reaching creeks and streams by up to 30%.

Retention Basin

by Wayne EddyWayne Eddy 31 Jul 2009 01:45

A Retention Basin is a large, open, partially free draining drainage basin designed to retain a portion of the storm runoff either for water quality treatment benefits, or to assist in reducing the effective volume of runoff. The free-draining portion of the basin may be designed to operate as a traditional detention or extended detention system.

Road Floodway

by Wayne EddyWayne Eddy 28 Oct 2010 06:18

A road floodway is a section of road designed to be overtopped by floodwater during relatively low average recurrence interval (ARI) floods.

Side Entry Pit

by Wayne EddyWayne Eddy 27 Jul 2009 01:45

A Side Entry Pit (SEP) is a stormwater pit located adjacent to kerb & channel designed to collect stormwater from a road surface.

Side Inlet Pit

by Wayne EddyWayne Eddy 30 Jul 2009 05:49

A side inlet pit is a stormwater pit located behind a length of kerb & channel with an opening under the backstone or lintel to capture road runoff.


by Wayne EddyWayne Eddy 14 Jul 2009 03:20

Stormwater is a term used to describe water that originates during precipitation events (rain).

Stormwater Drain

by Wayne EddyWayne Eddy 15 Dec 2008 04:41

A stormwater drain is an drainage channel, pipe, culvert or similar structure used to receive and transport stormwater.

Stormwater Drainage

by Wayne EddyWayne Eddy 14 Dec 2009 23:46

Stormwater Drainage is the process of or infrastructure associated with the drainage of stormwater.

Stormwater Installation

by Wayne EddyWayne Eddy 15 Dec 2008 05:03

Section 76(3) of the Queensland Local Government Act 2009 defines a Stormwater Installation for a property as -

  • any roof gutters, downpipes, subsoil drains or stormwater drain for the property; but
  • does not include any part of a local government's stormwater drain.

Stormwater Pipe

by Wayne EddyWayne Eddy 14 Jul 2009 02:34

A Stormwater Pipe (also Drainage Pipe) is a pipe designed or used for carrying stormwater.

Stormwater Pit

by Wayne EddyWayne Eddy 27 Jul 2009 04:56

A Stormwater Pit is a reinforced concrete chamber constructed below ground, designed to accept rainwater from surface inlets and/or one or more upstream stormwater pipes and to discharge this rainwater into a single downstream stormwater pipe.

Stormwater Quality Management Plan

by Wayne EddyWayne Eddy 24 Feb 2010 03:00

A Stormwater Quality Management Plan is a plan that establishes a framework “to manage stormwater quality in urban
waterways in a way that maintains or enhances the state of balance among environmental, social and economic interests within a community”.


by Wayne EddyWayne Eddy 25 May 2010 06:42

A Swale (also Swale Drain) is a shallow channel lined with vegetation, usually grass, used to convey stormwater.

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