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Weir (DSD_111)

DGIF baseline 2026-1, the latest. Earlier baselines: timemap.

RDF: dsd_111.ttl

Name

weir

Attribute

DSD Dam Structural Design Type

Definition

A small overflow-type dam commonly used to raise the upstream water level of a river or stream. Also commonly referred to as a Low Head Dam.

Description

Unlike large dams which create reservoirs, the goal of a weir (typically less than 15 metres tall) is not to create storage, but only to gain some control over the water level. Over time, the term weir has taken on a more general definition in engineering to apply to any hydraulic control structure that allows water to flow over its top, often called its crest. In fact, the spillways of many large dams use weirs as control structures. Although water flows over the top of a weir, some weirs also have sluice gates which can allow for the release water at a level below the top of the weir. They may be associated with locks to permit the passage of boats around the weir.

Synonyms

Low Head Dam

Accepted

2020-6-10

Defined by

VMST

Allowed for

• BI020 Dam

RWOI terms naming it

• RWO_04112 Weir
• RWO_04708 Low Head Dam

Source: DGIF 2026-1 QEA model, DGIWG. Standard: DGIWG 206-3. Licence: CC BY 4.0, © DGIWG.