Data Requirements Library
This Data Requirements Library documents the terminology and categories used to classify and describe Environment Agency (EA) assets. It also documents the specific data attributes that are used to describe the properties of each Asset Type and its Element Types.
Asset Categories
The EA has identified different types of Asset. These Asset Types are grouped into Asset Category groupings, as listed below.
The Asset Complex Category is a special case because its Assets are used to define geospatial areas, not physical assets. Similarly, the Information Deliverables Category defines document types and attributes to be used in filenames.
You can explore each Asset Type further by clicking on its name. This will take you to a more detailed description which may be supported by photos and diagrams that highlight key elements. There is also a table which lists the Element Types and specific data attributes that are used to describe that Asset Type.
Data about each Asset Type, Element Type and their attributes can also be accessed in JSON or CSV. These formats can be directly queried by remote applications to support supplier-side automation.
Please read the Data Requirements Library in conjunction with the Environment Agency Employers Information Requirements.
The View History link at the top of the page gives you access older versions of the DRL content. Further details about these versions can be found on the Data Services Platform Forum.
- Aids to Navigation
- Amenities
- Asset Complex
- Beach Structure
- Buildings and Compounds
- Channel
- Channel Crossings
- Defence
- Information Deliverables
- Instruments
- Land
- MEICA
- Public Safety
- Structure
Aids to Navigation
Assets that are used to aid navigation in the marine and fluvial environment.
| Asset Type | Description | Asset Code | Uniclass 2015 | Updates |
|---|---|---|---|---|
| Beacon | A marker structure that is fixed either to land or piled into the seabed/riverbed and is used to show ships and boats where they can go and to warn them of danger. | AB | Pr_40_10_90_07 | 17-05-2021 View history Request changes |
| Boat Lift | A machine which moves boats between bodies of water at two different elevations. It is an alternative to a lock or inclined plane. | AF | Ss_80_50_92_08 | 17-05-2021 View history Request changes |
| Boatroller | A bankside structure which incorporates rollers to allow small unpowered craft, such as canoes, to bypass a lock. | AR | SL_32_50_72 | 17-05-2021 View history Request changes |
| Buoy | A marker object that floats on the surface of the water and is used to show ships and boats where they can go and to warn them of danger. | AU | Pr_40_10_90_10 | 17-05-2021 View history Request changes |
| Canoe Pass | A channel of water designed to allow the bypass of locks by canoes and kayaks. | AC | SL_32_50_11 | 17-05-2021 View history Request changes |
| Canoe Portage Point | A prepared area designed to allow the ingress and egress of small boats, kayaks and canoes. | AP | SL_32_50_12 | 17-05-2021 View history Request changes |
| Dock | An enclosed area of water used for loading, unloading, building or repairing ships. A dock may have control gates at one end to facilitate the drainage of water to create a dry dock. | AO | En_30_85 | 17-05-2021 View history Request changes |
| Dolphin | A man-made marine structure that extends above the water level and is not connected to shore. | AD | En_32_85_24 | 17-05-2021 View history Request changes |
| Landing | A place for boats to wait or be temporarily parked before entering a lock. | AL | En_32_50_46 | 17-05-2021 View history Request changes |
| Lock | A chamber or stretch of channel enclosed by lock gates at each end, which allow the water level inside the lock to be adjusted. | AK | SL_80_70_11 | 17-05-2021 View history Request changes |
| Lock Island | The area of land between a lock and its associated water level control structure such as a weir or control gate. | AI | SL_80_70_48 | 17-05-2021 View history Request changes |
| Mooring | A place where a boat or vessel can be secured to stop it floating away. | AM | SL_32_50_53 | 03-02-2023 View history Request changes |
| Navigation Boom | A floating barrier strung across a navigable stretch of water to control or block navigation. | AN | Pr_40_10_90_55 | 17-05-2021 View history Request changes |
| Navigation Signage | Signage in the marine and fluvial environment which provides information or warnings to aid navigation. | AG | Pr_40_10_90 | 17-05-2021 View history Request changes |
| Signal | An asset which sends signals (light, sound or radio) to ships at sea, such as fog signals or traffic control signals. | AS | Pr_40_10_90_50 | 17-05-2021 View history Request changes |
| Warning Flag | A flag used to warn boats or vessels about danger. | AW | Ss_40_10_30_93 | 17-05-2021 View history Request changes |
Amenities
Assets that contribute to the accessibility or usability of a location.
| Asset Type | Description | Asset Code | Uniclass 2015 | Updates |
|---|---|---|---|---|
| Car Park or Hardstanding | An area of prepared ground with either hardcore or tarmac used for parking vehicles. | YC | En_80_45_85 | 17-05-2021 View history Request changes |
| Information Board | A structure which is designed to convey information to people (typically visitors). | YI | Pr_40_30_25 | 17-05-2021 View history Request changes |
| Pathway | A route, way or track laid out for walking or travelling on (but not with motor vehicles - see Vehicle Access Road). | YP | En_80_40 | 31-08-2021 View history Request changes |
| Vehicle Access Road | A purpose built track or road that allows vehicular access to an asset or group of assets. | YA | En_80_35_01 | 17-05-2021 View history Request changes |
Asset Complex
A grouping together of individual assets that can be considered as parts of a single site or complex with a high level purpose.
| Asset Type | Description | Asset Code | Uniclass 2015 | Updates |
|---|---|---|---|---|
| Biodiversity and Environmental Conservation | A group of associated assets which enhance or conserve biodiversity, habitats or the local environment in a certain area. | IV | Ss_45_35_08 | 17-05-2021 View history Request changes |
| Complex Beach Structure | A collection of beach assets which work together to protect the coast from erosion. | IB | Co_32_55_20 | 17-05-2021 View history Request changes |
| Complex Defence | A collection of assets which work together to provide flood defence or coastal protection functions. | ID | Co_32_55_30 | 17-05-2021 View history Request changes |
| Complex Structure | A collection of assets which work together to enable, restrict or affect the movement of water, people, fish, animals or materials. | IS | En_32_85_30 | 17-05-2021 View history Request changes |
| Control Structure | A group of assets which make up a control structure, to control water levels or flow in a watercourse. | IC | Co_32_85 | 05-09-2022 View history Request changes |
| Erosion Protection | A group of assets which work together to reduce erosion a particular feature or area. | IE | Co_32_55_27 | 17-05-2021 View history Request changes |
| Fish Farm | A place for artificial breeding, hatching, and rearing through the early life stages of animals for commercial and generic restocking purposes. | IF | Co_32_10_28 | 17-05-2021 View history Request changes |
| Fish Hatchery | A place for artificial breeding, hatching, and rearing through the early life stages of animals for conservation purposes. | II | Co_32_10_30 | 17-05-2021 View history Request changes |
| Flood Alleviation Scheme | A group of assets which work together to alleviate flooding to a defined area from a defined source. | IQ | Co_32 | 17-05-2021 View history Request changes |
| Harbour | A group of assets which make up a harbour. A harbour is an area of water next to the coast, often sheltered from the sea by a wall, where ships and boats can shelter. | IH | Co_80_70_36 | 17-05-2021 View history Request changes |
| Lock Complex | A group of associated assets which form a complex of locks, for example a series of locks. | IL | Co_32_85_50 | 17-05-2021 View history Request changes |
| Monitoring Station | A group of assets which make up a monitoring station. A monitoring station measures different parameters in the field depending on the type of monitoring station it is, such as: - Rain Gauge; - Borehole (measuring quality and / or quantity); - Climate station measuring atmospheric conditions including temperature, wind speed and direction, net radiation, atmospheric pressure, humidity, air quality; - Surface water quality. | IM | Co_25_30 | 17-05-2021 View history Request changes |
| Navigation Complex | A group of assets which work together in a defined location to aid or enable the navigation of waterways or coastlines. | IN | Co_32_50 | 17-05-2021 View history Request changes |
| Pumping Station | A group of assets which make up a pumping station. A pumping station could be: 1. A groundwater pumping station abstracts groundwater and delivers it to a water body. A groundwater scheme can be made up of multiple pumping stations. 2. A Surface Water Pumping Station abstracts water from one water body and delivers it to a different water body. A surface water transfer scheme can be made up of multiple pumping stations. | IP | Co_32_85_98 | 17-05-2021 View history Request changes |
| Recreational Complex | A group of assets providing a recreational facility in a certain location. | IA | Co_40 | 17-05-2021 View history Request changes |
| Reservoir | A group of assets which make up a reservoir. A reservoir is a large area for storing water which is created or enlarged by artificial means, and the associated impounding and control structures and assets. | IR | Co_32_85_70 | 05-09-2022 View history Request changes |
| Tidal Barrier | A group of assets which work together in a complex to provide a barrier to tidal flooding in an estuary or bay. A tidal barrier would usually includes assets such as control gates, central piers, a control building and any mechanical and electrical assets used to operate the control gates. | IT | Co_32_85_88 | 17-05-2021 View history Request changes |
| Water Level and Flow Monitoring Complex | A group of assets making up a water level and flow monitoring complex, which is in place to monitor water levels and flow in a watercourse, tide levels, or surface water levels. | IU | Co_32_85_97 | 17-05-2021 View history Request changes |
| Water Transfer Scheme | A group of associated assets which transfer water from one catchment or waterbody to another. | IW | Co_55_70_20 | 17-05-2021 View history Request changes |
Beach Structure
Assets used to protect the coast from erosion.
| Asset Type | Description | Asset Code | Uniclass 2015 | Updates |
|---|---|---|---|---|
| Breakwater | A wall or piled barrier built out into the sea or waterway to protect a shore, harbour or asset from the force of waves, or water flow or motion. | BB | En_32_85_10 | 05-09-2022 View history Request changes |
| Groyne | A linear structure extending from the shore into the sea that traps sediment moving along the shore, thus preventing longshore drift. | BG | En_32_85_35 | 02-12-2022 View history Request changes |
Buildings and Compounds
Assets that are used to provide shelter for equipment, storage or personnel.
| Asset Type | Description | Asset Code | Uniclass 2015 | Updates |
|---|---|---|---|---|
| Amenity Building | A building designed and/or used primarily for the provision of amenities. Amenities are something which makes life more pleasant or comfortable for people. | VY | En_40_05_68 | 03-02-2023 View history Request changes |
| Boathouse | A building designed and/or used primarily for the storage and/or maintenance of boats. | VB | En_30_85_07 | 03-02-2023 View history Request changes |
| Control Building | A building designed and/or used primarily to house the controls for operational assets. | VC | En_75_70_60 | 03-02-2023 View history Request changes |
| Garage | A building designed and/or used primarily for the storage and/or maintenance of vehicles. | VA | SL_90_50_33 | 03-02-2023 View history Request changes |
| Gauging Station Building | A building designed and/or used primarily for the housing of apparatus, equipment and fixtures for measuring river levels and flow. | VG | En_90_90_35 | 03-02-2023 View history Request changes |
| Lab Building | A building designed and/or used primarily for laboratory activities. | VL | En_25_30_40 | 03-02-2023 View history Request changes |
| Maintenance Building | A building designed and/or used primarily for the maintenance of equipment and assets or elements. | VM | En_30_60_50 | 03-02-2023 View history Request changes |
| Monitoring Building | A building designed and/or used primarily for the housing of apparatus, equipment and fixtures for the purpose of monitoring the environment. | VN | En_90_90_27 | 03-02-2023 View history Request changes |
| Office Building | A building primarily containing offices where work is done. | VF | Co_20_15_58 | 03-02-2023 View history Request changes |
| Precipitation Compound | A demarked space which is designed and maintained specifically to facilitate the measurement of precipitation. | VQ | En_32_40_65 | 03-02-2023 View history Request changes |
| Pump House | A building designed and used primarily to house pumps and the controls and facilities which support their operation. | VP | En_90_90_68 | 03-02-2023 View history Request changes |
| Residential Building | A building designed and/or used primarily for people to dwell in. | VR | En_45_10 | 03-02-2023 View history Request changes |
| Shelter | A place giving temporary protection from the elements. | VS | Ss_20_10_70 | 03-02-2023 View history Request changes |
| Storage Location | The location where equipment, such as temporary barriers or mobile instrumentation, is stored. | VE | Co_90_50_77 | 03-02-2023 View history Request changes |
| Visitor Centre | A building designed and/or used primarily as a centre for providing information and facilities to members of the public. | VV | En_40_75_94 | 03-02-2023 View history Request changes |
| Watermill | A building designed and/or used primarily for the housing of machinery for converting potential energy of water into useful power. | VT | En_30_80_96 | 03-02-2023 View history Request changes |
Channel
Assets that convey water.
| Asset Type | Description | Asset Code | Uniclass 2015 | Updates |
|---|---|---|---|---|
| Complex Culvert | A covered channel or pipe which conveys a watercourse through an obstacle. A complex culvert has a cross section which is made of more than one material. | CC | En_32_95_16 | 05-09-2022 View history Request changes |
| Natural Spring | A point at which groundwater flows from an aquifer at the Earth's surface. | CN | Co_32_65_82 | 02-12-2022 View history Request changes |
| Open Channel | A conduit in which water flows with a free surface, i.e. not culverted. | CP | En_32_95_59 | 02-12-2022 View history Request changes |
| Simple Culvert | A covered channel or pipe which conveys a watercourse through an obstacle. A simple culvert has a cross section which is made of the same material throughout. | CS | En_32_95_80 | 02-12-2022 View history Request changes |
Channel Crossings
Assets that allow access across a channel.
| Asset Type | Description | Asset Code | Uniclass 2015 | Updates |
|---|---|---|---|---|
| Bridge | A structure that spans a watercourse and allows the passage of road, rail, pedestrian and farm access. It also includes aqueducts. | RB | En_80_94 | 03-02-2023 View history Request changes |
| Ford | A shallow part of a watercourse that may be crossed on foot or by a vehicle in low flows. | RF | SL_32_50_30 | 17-05-2021 View history Request changes |
| Utility Services Crossing | A structure that spans a watercourse and allows a utility service to cross the watercourse. | RU | Ss_20_10_30_65 | 17-05-2021 View history Request changes |
Defence
Asset that provide flood defence or coastal protection functions. These include both man-made and natural defences. Natural defences may include man-made elements to make them more effective or protect them from erosion.
| Asset Type | Description | Asset Code | Uniclass 2015 | Updates |
|---|---|---|---|---|
| Barrier Beach | A sand or shingle bar above high tide, parallel to the coastline and usually separated from it by a lagoon. | DA | En_32_85_06 | 17-05-2021 View history Request changes |
| Beach | A pebbly or sandy shore found at the coast. | DB | En_32_65_06 | 17-05-2021 View history Request changes |
| Bridge Abutment | A supporting structure at the end of a bridge span that also acts as a flood defence. It ties into other flood defences and completes the line of defence against high river levels. | DG | Ss_20_50_10 | 05-09-2022 View history Request changes |
| Cliff | A steep rock face, especially one that runs along the coast. | DC | Co_32_65_15 | 05-09-2022 View history Request changes |
| Demountable Defence | Sections of flood defence that are removable (e.g. for visual amenity or access reasons). | DM | Ss_25_95_30 | 02-12-2022 View history Request changes |
| Dunes | Wind-blown sand mounds found along the coast. | DD | En_32_65_75 | 17-05-2021 View history Request changes |
| Embankment | An artificially raised, earthen ridge used in the fluvial, tidal and coastal environments for flood defence, erosion protection, or channel containment. | DE | En_32_85_45 | 02-12-2022 View history Request changes |
| Engineered High Ground | Retained, engineered or otherwise modified ground along watercourses or the coastline, that is not covered by one of the other defence asset types. | DR | En_32_40_37 | 17-05-2021 View history Request changes |
| Flood Gate | A gate providing access for pedestrians or vehicles through a flood defence, while maintaining flood protection when closed. | DF | Ss_25_36_30_30 | 02-12-2022 View history Request changes |
| Natural High Ground | Any extent along a watercourse or coastline which completes the line of continuous defence, but has not been modified in any way, so does not qualify as any of the other defence asset types. | DN | En_32_40_37 | 17-05-2021 View history Request changes |
| Promenade | A paved public walking area along the coast. | DP | En_80_40_66 | 17-05-2021 View history Request changes |
| Quay | A structure adjacent to or protruding into watercourse or the sea to load or unload boats. | DQ | En_32_50_69 | 17-05-2021 View history Request changes |
| Spillway | A structure designed to allow the controlled overflow or release of water from a reservoir or flood storage area, or over flood defences. | DS | En_32_85_82 | 17-05-2021 View history Request changes |
| Wall | A wall which is raised above the surrounding land and acts as a barrier against flooding from rivers or the sea. | DW | En_32_85_96 | 02-12-2022 View history Request changes |
Information Deliverables
Specific Information Deliverables scheduled in each project Information Delivery Plan (IDP) for each required delivery stage.
The *File Naming Attributes and *Information Purposes assets are not specific information deliverables but list the allowable values for different parts of the file names, and the purposes for which the the information may be used.
| Asset Type | Description | Asset Code | Uniclass 2015 | Updates |
|---|---|---|---|---|
| *File Naming Attributes | Lists of the allowable values for different parts of the file names, such as Author, Type and Delivery Stage, according to the required file-naming convention. | n/a | n/a | 27-04-2021 View history Request changes |
| *Information Purposes | The purposes that the information will or may be used to support. | n/a | n/a | 14-06-2021 View history Request changes |
| Asset Management | Information required relating to asset management. | J0000 | PM_80 | 27-04-2021 View history Request changes |
| Commercial Financial Products | Any commercial financial products generated in the delivery of the project. | F0000 | PM_50 | 27-04-2021 View history Request changes |
| Commissioning and Performance Evaluation (GSL) | Information required relating to commissioning and performance evaluation including Government Soft Landings (GSL). | M0000 | PM_35 | 27-04-2021 View history Request changes |
| Communications and Engagement | Information relating to communications, engagement and consultation. | N0000 | PM_80_20 | 14-06-2021 View history Request changes |
| Design | All supporting and analytical information relating to the design for the project outcome including calculations and justifications. | B0000 | PM_40_30 | 27-04-2021 View history Request changes |
| Economic Viability | Information required relating to economic viability. | H0000 | PM_50_30 | 27-04-2021 View history Request changes |
| Environmental | All supporting and analytical information relating to the environmental considerations of the design for the project outcome including assessments and agreements. | C0000 | PM_30_30 | 27-04-2021 View history Request changes |
| Health and Safety | All Health and Safety documentation relating to the project. | K0000 | PM_35_50 | 27-04-2021 View history Request changes |
| Modelling | Information required relating to hydraulic and fluvial modelling. | L0000 | PM_40_35 | 27-04-2021 View history Request changes |
| Permissions, ownership and responsibility | Records of any approvals granted. | I0000 | PM_40_50 | 27-04-2021 View history Request changes |
| Planning | Information required relating to planning. | R0000 | PM_80_10 | 27-04-2021 View history Request changes |
| Procurement Products | Information required relating to supplier procurement, tender and appointment. | G0000 | PM_50_50 | 27-04-2021 View history Request changes |
| Project Management | Any project management related information generated in the delivery of the project. | E0000 | PM_10_10 | 27-04-2021 View history Request changes |
| Site and Asset Conditions | Physical information about the project area (discovery). | A0000 | PM_60_10 | 27-04-2021 View history Request changes |
| Site-based works | All information relating to the works carried out on site, including construction. | D0000 | PM_60_10 | 27-04-2021 View history Request changes |
Instruments
Assets used to measure water level and flow.
| Asset Type | Description | Asset Code | Uniclass 2015 | Updates |
|---|---|---|---|---|
| CCTV Camera System | A CCTV (Closed Circuit Television) camera or group of connected CCTV cameras at a site and the associated onsite equipment. | NC | Ss_75_40_53_86 | 17-05-2021 View history Request changes |
| Flood Warning System | A device or mechanism situated in a flood risk area that warns people in the area of imminent flooding. | NF | Ss_75_60_55_30 | 17-05-2021 View history Request changes |
| Gauge Board | A board with numeral markings, used to measure and indicate the depth or level of water in a water body. | NG | Pr_80_51_70_96 | 05-09-2022 View history Request changes |
| Instrumentation | A device or connected system of devices to measure physical quantities in a particular location or relating to a particular asset. Examples of physical quantities include level, flow, temperature, position, pressure. | NI | Pr_80_51 | 05-09-2022 View history Request changes |
| Piezometer | An instrument for measuring pressure or depth in groundwater. | NP | Pr_80_51_51_62 | 02-12-2022 View history Request changes |
| Sample or Survey Point | A known point in the physical world from where correct orientation or a sample can be taken. | NS | Zz_35_80 | 17-05-2021 View history Request changes |
| Telecommunications | A fixed wire system that, via send and receive equipment, allows voice or data transmission from a fixed location to the receiving instrumentation. The system consists of two way communication cables and a master socket. | NL | Ss_75_10_21_88 | 05-09-2022 View history Request changes |
| Telemetry System | A telemetry system communicates data from an asset to a receiving system. | NT | Ss_75_70_54_03 | 05-09-2022 View history Request changes |
Land
Areas of land that are involved in water management.
| Asset Type | Description | Asset Code | Uniclass 2015 | Updates |
|---|---|---|---|---|
| Mudflats | Coastal wetlands that form in intertidal areas where sediments have been deposited by tides or rivers. | LM | En_32_65_55 | 17-05-2021 View history Request changes |
| Salt Marsh | Mudflats that have built up to a higher elevation so that vegetation is able to colonise. | LS | Co_32_65_75 | 17-05-2021 View history Request changes |
| Water Storage Area | An area of land that is deliberately engineered to hold water where it wouldn't naturally accumulate. | LW | Co_55_15_96 | 17-05-2021 View history Request changes |
MEICA
Mechanical, electrical, instrumentation, control and automation assets.
| Asset Type | Description | Asset Code | Uniclass 2015 | Updates |
|---|---|---|---|---|
| Automation Controls | Equipment used as an automated method of controlling a structure such as a pumping station. | MT | Ss_75_70 | 17-05-2021 View history Request changes |
| Engine Assembly | The assembled elements of a machine which burns or consumes fuel to perform mechanical work. | ME | Ss_85_50_65_40 | 14-06-2021 View history Request changes |
| Generator | A device that converts movement (mechanical energy) into electrical power for use in an external circuit. | MJ | Pr_60_70_65_34 | 17-05-2021 View history Request changes |
| High Voltage Electrical Equipment | Electrical equipment with a high voltage, usually 1000V or more. | MH | Ss_70_30_35 | 17-05-2021 View history Request changes |
| Hydraulic System Assembly | The assembled elements of a system that uses pressurised hydraulic fluid to power hydraulic machinery. | MY | Ss_85_50_65_38 | 17-05-2021 View history Request changes |
| Motor Control Centre Controls | Control panels that operate motorised equipment such as pumps or gates. | MC | Pr_75_50_18_53 | 17-05-2021 View history Request changes |
| Power Transmission | The asset(s) used for the movement of energy from its source to the location where it is used to perform its useful work. | MO | Ss_85_50_65 | 17-05-2021 View history Request changes |
| Pressure System Assembly | The assembled elements of a pressure system, which includes all plant/systems that contain a 'relevant fluid' under pressure. | MD | Ss_55_20_60_15 | 17-05-2021 View history Request changes |
| Pump Assembly | The assembled elements of a device that raises, transports or compresses fluids by mechanical action. | MP | Pr_65_53 | 02-12-2022 View history Request changes |
| Sand Bagging Equipment | Equipment used to fill sand bags for use in Incident Response. | MK | Pr_40_70_66_75 | 17-05-2021 View history Request changes |
| Solar Farm | A group of photovoltaic solar panels that supply electricity to the national grid; it does not directly supply electricity to an asset. | MS | Ss_70_10_70_35 | 17-05-2021 View history Request changes |
| Wind Power Generator | A stand alone power generator system for collecting the wind's kinetic energy. | MV | Ss_70_10_70_98 | 17-05-2021 View history Request changes |
Public Safety
Environment Agency managed assets that are used in the protection of public safety.
| Asset Type | Description | Asset Code | Uniclass 2015 | Updates |
|---|---|---|---|---|
| PSRA Tree Site | A group of PSRA (Public Safety Risk Assessment) measures at a tree or group of trees that are used to guard public safety and control any risks to public safety caused by those trees. | KT | Co_32_65_96 | 05-09-2022 View history Request changes |
| Public Safety Control System | A group of measures at an asset or group of assets that are used to guard public safety and control any risks to public safety caused by that asset. | KP | Co_75 | 17-05-2021 View history Request changes |
Structure
Assets used to enable, restrict or affect the movement of water, people, fish, animals or materials.
| Asset Type | Description | Asset Code | Uniclass 2015 | Updates |
|---|---|---|---|---|
| Animal Trap | A device designed to trap animals without injuring them, for example so they can be tagged or checked. | TK | Pr_40_30_22_38 | 31-08-2021 View history Request changes |
| Borehole | A shaft bored into the ground that is used to extract groundwater via a pump, or to monitor and/or measure water quality and/or quantity. | SA | Ss_15_95_15_10 | 02-12-2022 View history Request changes |
| Cableway | A system used for transporting items from point A to B via a cable suspended between two towers or structures. | TA | SL_80_20_13 | 17-05-2021 View history Request changes |
| Central Pier | A significant central supporting structure built in a channel. | TF | Ss_20_50_20 | 17-05-2021 View history Request changes |
| Control Gate | An adjustable gated structure used to control water levels and flow in watercourses, for water flow management, flood control and navigation. | SG | En_32_85_15 | 02-12-2022 View history Request changes |
| Debris Boom | A floating barrier across a watercourse designed to catch debris which could interfere with the operation of an asset. | SB | Pr_40_70_27_22 | 17-05-2021 View history Request changes |
| Debris Screen | A screen that reduces the amount of trash and debris entering culverts, outfalls or channels (where it could cause a blockage). | SR | En_32_85_23 | 02-12-2022 View history Request changes |
| Draw Off Tower | A vertical tubular structure with one or more openings used for removing water from reservoirs and diverting it elsewhere. | SD | En_32_85_25 | 17-05-2021 View history Request changes |
| Fish Pass | A structure that enables fish, eels or lampreys to bypass an obstacle in a channel such as a lock, weir or control gate. | SF | Ss_45_75_30 | 02-12-2022 View history Request changes |
| Fish Refuge | A floating wire mesh refuge providing cover for smaller fish. | TE | Pr_45_28_30_30 | 17-05-2021 View history Request changes |
| Fish or Eel Barrier | A barrier that prevents the movement of aquatic life into areas that may jeopardise their survival. | TB | Ss_45_75_25_05 | 17-05-2021 View history Request changes |
| Fishing Cage | A system that confines fish or shellfish in a mesh enclosure. Must be fixed in location. | TC | En_32_10_29 | 17-05-2021 View history Request changes |
| Fishing Platform | A horizontal construction on the bank of a reservoir, river or lake to allow safe and inclusive access primarily for fishing, usually protruding slightly over the water. | TP | En_32_50_96 | 17-05-2021 View history Request changes |
| In Channel Stoplogs | An adjustable structure used to control water levels and flow in watercourses, for water flow management, flood control, and navigation. | SC | Ss_55_70_99_84 | 05-09-2022 View history Request changes |
| Inspection Chamber | An opening to a confined space such as a culverted watercourse or underground services, providing access for testing, inspecting, maintaining and clearing blockages. | SN | Pr_65_52_01 | 05-09-2022 View history Request changes |
| Jetty | A solid structure that projects from the land out into a body of water, providing access to deeper water or to moored vessels. It must prevent currents and tides waves passing through it (otherwise use Pier). | SJ | En_32_50_44 | 17-05-2021 View history Request changes |
| Mine Adit | A horizontal or near-horizontal entrance to an underground mine. | TM | Ss_37_50_92_15 | 02-12-2022 View history Request changes |
| Mine Shaft | A vertical or near-vertical entrance to an underground mine. | TN | SL_30_10_93 | 02-12-2022 View history Request changes |
| Outfall | The structure at the point where surface water drains discharge into a watercourse or the sea. | SU | En_32_85_59 | 02-12-2022 View history Request changes |
| Pier | A raised structure that projects from the land over a body of water, providing access to deeper water or to moored vessels. Often on piles or pillars, it must allow some water currents and/or waves to pass beneath (otherwise use Jetty). | SO | En_32_50_63 | 05-09-2022 View history Request changes |
| Ramp | A sloped access route between two different levels. | TR | EF_35_20_30 | 17-05-2021 View history Request changes |
| Sand Trap | A structure for aerating groundwater. Also used to trap sand and soil particles. | SX | En_32_85_75 | 17-05-2021 View history Request changes |
| Security Screen | A screen which prevents unauthorised access to culverts, outfalls and channels. | SY | Pr_25_96_35_37 | 17-05-2021 View history Request changes |
| Slipway | A slope or ramp leading down into water (channel or sea) used for launching/landing boats. | TS | SL_32_50_79 | 02-12-2022 View history Request changes |
| Soil Moisture Tube | An underground device for monitoring the moisture content of the soil | SV | Pr_80_51_51_80 | 05-09-2022 View history Request changes |
| Steps | A series of treads and risers as an access route between two different levels (not a ladder). | TT | Ss_35_10_25 | 02-12-2022 View history Request changes |
| Stilling Basin | A depressed area in a channel or reservoir that is deep enough to reduce the velocity of the water before it passes further downstream. | ST | En_32_85_84 | 17-05-2021 View history Request changes |
| Stilling Well | A chamber that is connected to a water body by one or more inlets. The water level in the stilling well will rise and fall with the level in the water body, but will not be subject to the turbulence that may be present in the water body, allowing for more accurate level measurement. | SI | SL_32_85_84 | 14-06-2021 View history Request changes |
| Surface Water Tank | A buried tank for collecting and storing surface water for further use or attenuation. | SK | Ss_50_70_85_06 | 17-05-2021 View history Request changes |
| Vortex Flow Control | A flow control structure which uses a vortex flow control device to control the flow. | SH | SL_32_85_94 | 05-09-2022 View history Request changes |
| Water Baffles | An obstruction placed in the flow of water in order to redirect all or partial flow and create a variation in flow velocities. | TL | Ss_55_70_99_96 | 17-05-2021 View history Request changes |
| Water Distribution Pipeline | The pipe work attached to a pumping station that delivers water to a water body. A pipeline may be attached to multiple pumping stations. | TD | En_55_15_72 | 17-05-2021 View history Request changes |
| Weir | A low barrier that is built across the width of a watercourse to control the flow or upstream water level. | SW | En_32_85_97 | 05-09-2022 View history Request changes |
| Well | A shaft sunk into the ground for collecting groundwater. | TW | En_32_85_98 | 17-05-2021 View history Request changes |