Glossary of Terms
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
average recurrence interval (ARI)
The average interval in years between the occurrence of a flow, discharge or rainfall greater than or equal to a specified amount.
A uniform slope.
A horizontal ledge at the top of an earth bank.
An open waterway.
Any channel or pipe for flowing water.
A reduction in waterway area.
A covered channel or pipe for carrying a watercourse below ground level, usually under a road or railway.
Diameter of the drain.
The volume of fluid per unit time flowing along a pipe or channel.
Acquired right or privilege held by a person or public authority, including Melbourne Water, to make specific use of land owned privately or by another authority.
Anything within the scope of Melbourne Water activities affecting a property that would not be disclosed by a search at the Titles Office.
The point at which a branch drain joins the main drain.
The energy lost at an entry point due to turbulence.
An increase in waterway area.
A channel designed to carry flows in excess of the underground drain capacity.
The vertical distance of a defined point or feature above the design water level.
The gradient of sloping features. This is expressed as 1:5 (vertical:horizontal) for batters and `1 in 200' for drains and slopes.
The potential energy per unit weight of fluid above a certain point. This point is usually the height of the free water level.
The loss of head between two points in a pipe or channel.
A line along a pipeline which shows the levels to which the water would rise in open pipes leading up from the pipeline.
The point at which a branch drain discharges into the main drain.
The floor of the drain.
A load which may be moved onto or off a structure.
The weight carried by a structure.
An access hole to the drain to allow a person to enter.
Manning's roughness coefficient
A value that expresses the friction or resistance to flow due to the surface texture of the channel or pipe.
The top of the inside of the drain.
The point at which the underground drain discharges into an open watercourse.
A pipeline construction technique which pushes the pipes through the ground using hydraulic rams.
Ponded water flowing over and down the face of a small natural or raised section of stream bed.
Concrete that can be eroded without affecting the structural integrity of a structure.
Pipes with non-parallel end faces.
The junction of two drains with different waterway area and/or shape.
The energy per unit weight of water due to its velocity. It is also the vertical distance the fluid must fall freely under gravity to reach its velocity.
The length of the channel surface in contact with the water, measured on a channel cross section.
