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 Exchange Information Requirements.
The View History link at the top of the page gives you access to older versions of the DRL content. Further details about these versions can be found on Data Services Platform Support.
- Aids to Navigation
- Amenities
- Asset Complex
- Beach Structure
- Buildings and Compounds
- Channel
- Channel Crossings
- Defence
- Information Deliverables
- Instruments
- Land
- MEICA
- Public Safety
- Structure
Quick Links
The following links provide quick access to the complete lists of Asset Categories, Asset Types, Elements, Attributes and Picklists defined in the currently-selected version of the DRL data.
Asset Categories
Asset Types are grouped into Asset Categories. These links provide access to the complete list of Asset Categories defined in the currently-selected version of the data.
Asset Types
These links provide access to the complete list of Asset Types defined in the currently-selected version of the data.
Elements
Each Asset Type is composed of a set of Element Types. These links provide access to the completed set of Element Types defined across all Asset Types in the currently-selected version of the data.
Attributes
Each Asset and Element Type is described by a set of attributes. These links provide access to the complete list of Attributes defined across all Asset and Element Types in the currently-selected version of the data. Warning: The attributes file is large, and may take some time to download.
Aids to Navigation
Assets that are used to aid navigation in the marine and fluvial environment.
27-04-2021
| Asset Type | Description | Asset Code | Uniclass 2015 | Geometry Type | 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Boatroller | A bankside structure which incorporates rollers to allow small unpowered craft, such as canoes, to bypass a lock. | AR | SL_32_50_72 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Canoe Pass | A channel of water designed to allow the bypass of locks by canoes and kayaks. | AC | SL_32_50_11 | 27-04-2021 | |
| Canoe Portage Point | A prepared area designed to allow the ingress and egress of small boats, kayaks and canoes. | AP | SL_32_50_12 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Dolphin | A man-made marine structure that extends above the water level and is not connected to shore. | AD | En_32_85_24 | 27-04-2021 | |
| Landing | A place for boats to wait or be temporarily parked before entering a lock. | AL | En_32_50_46 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Mooring | A place where a boat or vessel can be secured to stop it floating away. | AM | SL_32_50_53 | 27-04-2021 | |
| Navigation Boom | A floating barrier strung across a navigable stretch of water to control or block navigation. | AN | Pr_40_10_90_55 | 27-04-2021 | |
| Navigation Signage | Signage in the marine and fluvial environment which provides information or warnings to aid navigation. | AG | Pr_40_10_90 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Warning Flag | A flag used to warn boats or vessels about danger. | AW | Ss_40_10_30_93 | 27-04-2021 |
Amenities
Assets that contribute to the accessibility or usability of a location.
27-04-2021
| Asset Type | Description | Asset Code | Uniclass 2015 | Geometry Type | Updates |
|---|---|---|---|---|---|
| Car Park or Hardstanding | An area of prepared ground with either hardcore or tarmac used for parking vehicles. | YC | En_80_45_85 | 27-04-2021 | |
| Information Board | A structure which is designed to convey information to people (typically visitors). | YI | Pr_40_30_25 | 27-04-2021 | |
| 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 | 27-04-2021 |
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.
27-04-2021
| Asset Type | Description | Asset Code | Uniclass 2015 | Geometry Type | 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 | 27-04-2021 | |
| Complex Beach Structure | A collection of beach assets which work together to protect the coast from erosion. | IB | Co_32_55_20 | 27-04-2021 | |
| Complex Defence | A collection of assets which work together to provide flood defence or coastal protection functions. | ID | Co_32_55_30 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Erosion Protection | A group of assets which work together to reduce erosion a particular feature or area. | IE | Co_32_55_27 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Flood Alleviation Scheme | A group of assets which work together to alleviate flooding to a defined area from a defined source. | IQ | Co_32 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Lock Complex | A group of associated assets which form a complex of locks, for example a series of locks. | IL | Co_32_85_50 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Recreational Complex | A group of assets providing a recreational facility in a certain location. | IA | Co_40 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Water Transfer Scheme | A group of associated assets which transfer water from one catchment or waterbody to another. | IW | Co_55_70_20 | 27-04-2021 |
Beach Structure
Assets used to protect the coast from erosion.
27-04-2021
| Asset Type | Description | Asset Code | Uniclass 2015 | Geometry Type | 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 | 27-04-2021 | |
| 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 | 27-04-2021 |
Buildings and Compounds
Assets that are used to provide shelter for equipment, storage or personnel.
27-04-2021
| Asset Type | Description | Asset Code | Uniclass 2015 | Geometry Type | 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 | 27-04-2021 | |
| Boathouse | A building designed and/or used for the storage and/or maintenance of boats. | VB | En_30_85_07 | 27-04-2021 | |
| Control Building | A building designed and/or used to house the controls for operational assets. | VC | En_75_70_60 | 27-04-2021 | |
| Garage | A building designed and/or used for the storage and/or maintenance of vehicles. | VA | SL_90_50_33 | 27-04-2021 | |
| Gauging Station Building | A building designed and/or used for the housing of apparatus, equipment and fixtures for measuring river levels and flow. | VG | En_90_90_35 | 27-04-2021 | |
| Lab Building | A building designed and/or used for laboratory activities. | VL | En_25_30_40 | 27-04-2021 | |
| Maintenance Building | A building designed for the maintenance of equipment and assets or elements. | VM | En_30_60_50 | 27-04-2021 | |
| Monitoring Building | A building designed and/or used for the housing of apparatus, equipment and fixtures for the purpose of monitoring the environment. | VN | En_90_90_27 | 27-04-2021 | |
| Office Building | A building containing offices where work is done. | VF | Co_20_15_58 | 27-04-2021 | |
| Pump House | A building designed and used to house pumps and the controls and facilities which support their operation. | VP | En_90_90_68 | 27-04-2021 | |
| Residential Building | A building designed and/or used primarily for people to dwell in. | VR | En_45_10 | 27-04-2021 | |
| Shelter | A place giving temporary protection from the elements. | VS | Ss_20_10_70 | 27-04-2021 | |
| Storage Location | The location where equipment, such as temporary barriers or mobile instrumentation, is stored. | VE | Co_90_50_77 | 27-04-2021 | |
| Visitor Centre | A building designed and/or used as a centre for providing information and facilities to members of the public. | VV | En_40_75_94 | 27-04-2021 | |
| Watermill | A building designed and/or used for the housing of machinery for converting potential energy of water into useful power. | VT | En_30_80_96 | 27-04-2021 |
Channel
Assets that convey water.
27-04-2021
| Asset Type | Description | Asset Code | Uniclass 2015 | Geometry Type | 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 | 27-04-2021 | |
| Open Channel | A conduit in which water flows with a free surface, i.e. not culverted. | CP | En_32_95_59 | 27-04-2021 | |
| 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 | 27-04-2021 |
Channel Crossings
Assets that allow access across a channel.
27-04-2021
| Asset Type | Description | Asset Code | Uniclass 2015 | Geometry Type | 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Utility Services Crossing | A structure that spans a watercourse and allows a utility service to cross the watercourse. | RU | Ss_20_10_30_65 | 27-04-2021 |
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.
27-04-2021
| Asset Type | Description | Asset Code | Uniclass 2015 | Geometry Type | 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 | 27-04-2021 | |
| Beach | A pebbly or sandy shore found at the coast. | DB | En_32_65_06 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Cliff | A steep rock face, especially one that runs along the coast. | DC | Co_32_65_15 | 27-04-2021 | |
| Demountable Defence | Sections of flood defence that are removable (e.g. for visual amenity or access reasons). | DM | Ss_25_95_30 | 27-04-2021 | |
| Dunes | Wind-blown sand mounds found along the coast. | DD | En_32_65_75 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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_85_37 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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_85_37 | 27-04-2021 | |
| Promenade | A paved public walking area along the coast. | DP | En_80_40_66 | 27-04-2021 | |
| Quay | A structure adjacent to or protruding into watercourse or the sea to load or unload boats. | DQ | En_32_50_69 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 |
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.
27-04-2021
| Asset Type | Description | Asset Code | Uniclass 2015 | Geometry Type | 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 | |
| *Information Purposes | The purposes that the information will or may be used to support. | n/a | n/a | 27-04-2021 | |
| Asset Management | Information required relating to asset management. | J0000 | PM_80 | 27-04-2021 | |
| Commercial Financial Products | Any commercial financial products generated in the delivery of the project. | F0000 | PM_50 | 27-04-2021 | |
| Commissioning and Performance Evaluation (GSL) | Information required relating to commissioning and performance evaluation including Government Soft Landings (GSL). | M0000 | PM_35 | 27-04-2021 | |
| Communications and Engagement | Information relating to communications, engagement and consultation. | N0000 | TBC | 27-04-2021 | |
| 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 | |
| Economic Viability | Information required relating to economic viability. | H0000 | PM_50_30 | 27-04-2021 | |
| 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 | |
| Health and Safety | All Health and Safety documentation relating to the project. | K0000 | PM_35_50 | 27-04-2021 | |
| Modelling | Information required relating to hydraulic and fluvial modelling. | L0000 | PM_40_35 | 27-04-2021 | |
| Permissions, ownership and responsibility | Records of any approvals granted. | I0000 | PM_40_50 | 27-04-2021 | |
| Planning | Information required relating to planning. | R0000 | PM_80_10 | 27-04-2021 | |
| Procurement Products | Information required relating to supplier procurement, tender and appointment. | G0000 | PM_50_50 | 27-04-2021 | |
| Project Management | Any project management related information generated in the delivery of the project. | E0000 | PM_10_10 | 27-04-2021 | |
| Site and Asset Conditions | Physical information about the project area (discovery). | A0000 | PM_60_10 | 27-04-2021 | |
| Site-based works | All information relating to the works carried out on site, including construction. | D0000 | PM_60_10 | 27-04-2021 |
Instruments
Assets used to measure water level and flow.
27-04-2021
| Asset Type | Description | Asset Code | Uniclass 2015 | Geometry Type | Updates |
|---|---|---|---|---|---|
| CCTV Camera System | A CCTV camera or group of connected CCTV cameras at a site and the associated onsite equipment. | NC | Ss_75_40_53_86 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Gauge Board | A board with numeral markings, used to measure and indicate the depth or level of water in a water body. | NG | Pr_75_50_47_96 | 27-04-2021 | |
| Instrumentation | A device installed in a particular location to measure physical quantities. | NI | Pr_80_51 | 27-04-2021 | |
| Piezometer | An instrument for measuring pressure or depth in groundwater. | NP | Pr_80_51_51_62 | 27-04-2021 | |
| Rain Gauge | An instrument for collecting and measuring the amount of precipitation falling in a particular location. | NR | Pr_75_50_52 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Telemetry System | A telemetry system communicates data from an asset to a receiving system. | NT | Ss_75_70_54_03 | 27-04-2021 |
Land
Areas of land that are involved in water management.
27-04-2021
| Asset Type | Description | Asset Code | Uniclass 2015 | Geometry Type | Updates |
|---|---|---|---|---|---|
| Mudflats | Coastal wetlands that form in intertidal areas where sediments have been deposited by tides or rivers. | LM | En_32_65_55 | 27-04-2021 | |
| Salt Marsh | Mudflats that have built up to a higher elevation so that vegetation is able to colonise. | LS | Co_32_65_75 | 27-04-2021 | |
| 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 | 27-04-2021 |
MEICA
Mechanical, electrical, instrumentation, control and automation assets.
27-04-2021
| Asset Type | Description | Asset Code | Uniclass 2015 | Geometry Type | Updates |
|---|---|---|---|---|---|
| Automation Controls | Equipment used as an automated method of controlling a structure such as a pumping station. | MT | Ss_75_70 | 27-04-2021 | |
| Engine Assembly | The assembled elements of a machine which burns or consumes fuel to perform mechanical work. | ME | Ss_85_50_65_40 | 27-04-2021 | |
| Generator | A device that converts movement (mechanical energy) into electrical power for use in an external circuit. | MJ | Pr_60_70_65_34 | 27-04-2021 | |
| High Voltage Electrical Equipment | Electrical equipment with a high voltage, usually 1000V or more. | MH | Ss_70_30_35 | 27-04-2021 | |
| Hydraulic System Assembly | The assembled elements of a system that uses pressurised hydraulic fluid to power hydraulic machinery. | MY | Ss_85_50_65_38 | 27-04-2021 | |
| Motor Control Centre Controls | Control panels that operate motorised equipment such as pumps or gates. | MC | Pr_75_50_18_53 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Pump Assembly | The assembled elements of a device that raises, transports or compresses fluids by mechanical action. | MP | Pr_65_53 | 27-04-2021 | |
| Sand Bagging Equipment | Equipment used to fill sand bags for use in Incident Response. | MK | Pr_40_70_66_75 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Wind Power Generator | A stand alone power generator system for collecting the wind's kinetic energy. | MV | Ss_70_10_70_98 | 27-04-2021 |
Public Safety
Environment Agency managed assets that are used in the protection of public safety.
27-04-2021
| Asset Type | Description | Asset Code | Uniclass 2015 | Geometry Type | Updates |
|---|---|---|---|---|---|
| PSRA Tree Site | A group of 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 | 27-04-2021 | |
| 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 | 27-04-2021 |
Structure
Assets used to enable, restrict or affect the movement of water, people, fish, animals or materials.
27-04-2021
| Asset Type | Description | Asset Code | Uniclass 2015 | Geometry Type | Updates |
|---|---|---|---|---|---|
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Central Pier | A significant central supporting structure built in a channel. | TF | Ss_20_50_20 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Eel Pass | A structure that enables eels to bypass an obstacle in a channel such as a lock, weir or control gate. | SE | Ss_45_75_30_27 | 27-04-2021 | |
| Fish Pass | A structure that enables fish to bypass an obstacle in a channel such as a lock, weir or control gate. | SF | Ss_45_75_30_30 | 27-04-2021 | |
| Fish Refuge | A floating wire mesh refuge providing cover for smaller fish. | TE | Pr_45_28_30_30 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Fishing Cage | A system that confines fish or shellfish in a mesh enclosure. Must be fixed in location. | TC | En_32_10_29 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Lamprey Pass | A structure that enables lampreys to bypass an obstacle in a channel such as a lock, weir or control gate. | SL | Ss_45_75_30_44 | 27-04-2021 | |
| Outfall | The structure at the point where surface water drains discharge into a watercourse or the sea. | SU | En_32_85_59 | 27-04-2021 | |
| 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 it (otherwise use Jetty). | SO | En_32_50_63 | 27-04-2021 | |
| Ramp | A sloped access route between two different levels. | TR | EF_35_20_30 | 27-04-2021 | |
| Sand Trap | A structure for aerating groundwater. Also used to trap sand and soil particles. | SX | En_32_85_75 | 27-04-2021 | |
| Security Screen | A screen which prevents unauthorised access to culverts, outfalls and channels. | SY | Pr_25_96_35_37 | 27-04-2021 | |
| Slipway | A slope or ramp leading down into water (channel or sea) used for launching/landing boats. | TS | SL_32_50_79 | 27-04-2021 | |
| Steps | A series of treads and risers as an access route between two different levels (not a ladder). | TT | Ss_35_10_25 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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. | SI | SL_32_85_84 | 27-04-2021 | |
| Surface Water Tank | A buried tank for collecting and storing surface water for further use or attenuation. | SK | Ss_50_70_85_06 | 27-04-2021 | |
| Vortex Flow Control | A flow control structure which uses a vortex flow control device to control the flow. | SH | SL_32_85_94 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| 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 | 27-04-2021 | |
| Well | A shaft sunk into the ground for collecting groundwater. | TW | En_32_85_98 | 27-04-2021 |