Glossary - Planning Inspectorate Biodiversity Mitigation Strategy BMV Best and Most Versatile...

May 2014Application Reference EN020001

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Hinkley Point C Connection Project

Regulation 5(2)(q) of the Infrastructure Planning (Applications: Prescribed Forms and Procedure) Regulations 2009

Glossary

GLOSSARY OF TERMS AND ABBREVIATIONS

Abbreviation Term

AA Appropriate Assessment

AADT Annual Average Daily Traffic Flow

AAWT Annual Average Weekday Traffic Flow

AC Alternating Current

ACD Anti Climbing Device

ACOW Archaeological Clerk of Works

ADMS Atmospheric Dispersion Modelling System

AGI Above Ground Installation

AGLV Area of Great Landscape Value

AIL Abnormal Indivisible Load

AIS Air Insulated Switchgear

ALC Agricultural Land Classification

ALO Agricultural Liaison Officers

AOD Above Ordnance Datum

AONB Area of Outstanding Natural Beauty

AOS Area of Search

APFP Infrastructure Planning (Applications: Prescribed Forms

and Procedure) Regulations 2009 (as amended)

AQMA Air Quality Management Area

ATC Automatic Traffic Counter

AWT Avon Wildlife Trust

BAP Biodiversity Action Plan

BBS Breeding Birds Survey

BCC Bristol City Council

BCT Bat Conservation Trust

BGS British Geological Survey

BMS Biodiversity Mitigation Strategy

BMV Best and Most Versatile Agricultural Land (Grades 1, 2

and 3a)

bn Billion

BoCC Birds of Conservation Concern

BoR Book of Reference

BRERC Bristol Regional Environmental Records Centre

BS British Standard

BSP Bulk Supply Point


BTEX Benzene, Toluene, Ethylbenzene and Xylene

BTG Biodiversity Thematic Group

BTO British Trust for Ornithology

CaCO3 Calcium Carbonate (mineral)

CAMS Catchment Abstraction Management Strategy

CBA Cost Benefit Analysis

CBR The California Bearing Ratio

CCGT Combined Cycle Gas Turbine

CCS Considerate Contractor’s Scheme

CCTV Closed Circuit Television

CDM Regulations Construction (Design and Management) Regulations 2007

CEMP Construction Environmental Management Plan

CFMP Catchment Flood Management Plan

CIEEM Chartered Institute of Ecology and Environmental

Management

CIRIA Construction Industry Research and Information

Association

CLA Country Land and Business Association

CLR11 Contaminated Land Report 11

CoCP Code of Construction Practice

COSHH Control of Substances Hazardous to Health Regulations

2002

CPRE Campaign to Protect Rural England

CSC Current Source Conductor.

CSE Compound Cable Sealing End Compound

CSEPP Cable Sealing End Pylon Platform

CSM Conceptual Site Model

CTMP Construction Traffic Management Plan

CWS County Wildlife Site

D&B Dun and Bradstreet

DAS Design and Access Statement

DC Direct Current

DCLG Department for Communities and Local Government

DCMS Department of Culture, Media & Sport

DCO Development Consent Order

DCP Dynamic Cone Penetrometer

DD Double Diamond T-Pylon

DECC Department of Energy and Climate Change

DEFRA Department for the Environment, Food and Rural Affairs

DfT Department for Transport


DMP Drainage Management Plan

DMRB Design Manual for Roads and Bridges

DMV Deserted Medieval Village

DNO Distribution Network Operator

DPD Development Plan Document

DSOR Distribution System Options Report

DTM Digital Terrain Model

EA Environment Agency

EC European Commission

EcIA Ecological Impact Assessment

ECOW Ecological Clerk of Works

EDF Electricité de France

EH English Heritage

EIA Environmental Impact Assessment

EM Explanatory Memorandum

EMC Electro-magnetic Compatibility

EMF Electric and Magnetic Fields

EMMP Environmental Management and Monitoring Plan

ENSG Electricity Networks Strategy Group

EPR European Pressurised Reactor

EP UK Environmental Protection UK

ES Environmental Statement

ESA Environmentally Sensitive Area

EU European Union

EWEA European Wind Energy Association

FCS Favourable Conservation Status

FISC Field Identification Skills Certificate

FLT Full line tension gantry

FRA Flood Risk Assessment

GCN Great Crested Newt

GCR Geological Conservation Review Sites

GIL Gas Insulated Line

GIS Gas Insulated Switchgear

GLA Greater London Authority

GPLC Guideline Principals of Land Contamination

GPS Global positioning system - Used to determine location

on the ground.

GSP Grid Supply Point

GW Gigawatt (1000 million Watts)

H&S Health and Safety


Ha Hectare

HA Highways Agency

HDD Horizontal Directional Drilling

HDV Heavy Duty Vehicle

HER Historic Environment Record

HGV Heavy Goods Vehicle

HIA Health Impact Assessment

HIS Hybrid Insulated Switchgear

HNC Higher National Certificate

HND Higher National Diploma

HPC Health Protection Agency

HRA Habitat Regulations Assessment

HV High Voltage

HVAC High Voltage Alternating Current

HVDC High Voltage Direct Current

Hz Hertz - one cycle per second

IAQM Institute of Air Quality Management

ICM Interim Connect and Manage

ICNIRP International Commission on Non-Ionising Radiation

Protection

IDB Internal Drainage Board

IEA Institute of Environmental Assessment

IEMA Institute of Environmental Management and Assessment

IET Institution of Engineering and Technology

IfA Institute for Archaeologists

IMD Index of Multiple Deprivation

IPC Infrastructure Planning Commission

IPCC Intergovernmental Panel on Climate Change

JNCC Joint Nature Conservation Committee

kA Kiloampere (1000 Amperes)

km Kilometre

kV Kilovolt (1,000 volts)

kWh Kilo-Watt Hour

LA Local Authority

LAQM Local Air Quality Management

LBAP Local Biodiversity Action Plan

LCA Landscape Character Assessment

LDD Local Development Document

LDF Local Development Framework

LI Landscape Institute


LiDAR Light Detection and Ranging

LLCA Local Landscape Character Area

LLFA Lead Local Flood Authority

LNR Local Nature Reserve

LoD Limits of Deviation

LPA Local Planning Authority

LRN Local Road Network

LWS Local Wildlife Site

m Metre

MAGIC Multi-Agency Geographic Information for the Countryside

MEWP Mobile Elevated Working Platform

MITS Main Interconnected Transmission System

MMO Marine Management Organisation

MMG Mercia Mudstone Group

MMQ Mean maximum queue at the arm of a junction.

MOD Ministry of Defence

ms Millisecond (one thousandth of a second)

MVA Megavolt Ampere

MW Megawatt (one million watts or one thousand kilowatts).

NAQS National Air Quality Strategy

NGET National Grid Electricity Transmission plc

NBN National Biodiversity Network

NCA National Character Areas

NCR National Cycle Route

NE Natural England

NERC 2006 Natural Environment and Rural Communities Act 2006

NETS National Electricity Transmission System

NETS SQSS National Electricity Transmission System Security and

Quality of Supply Standard

NFU National Farmers Union

NG National Grid

NGET National Grid Electricity Transmission

NGR National Grid Reference

NLCA National Landscape Character Area

NNR National Nature Reserve

NO2 Nitrogen Dioxide

NOx Oxides of nitrogen

NPPF National Planning Policy Framework

NPS National Policy Statement

NRPB National Radiological Protection Board


NSC North Somerset Council

NSIP Nationally Significant Infrastructure Project

NT National Trust

NTM National Transport Model

NTS Not to Scale

NVC National Vegetation Classification

NVQ National Vocational Qualification

OAT Options Appraisal Table

OD Ordnance Datum

ODIS Offshore Development Information Statement

ODPM Office of the Deputy Prime Minister

OFGEM Office of the Gas and Electricity Markets

OHL Overhead line

ONS Office of National Statistics

OS Ordnance Survey

O3 Ozone

PAH Polycyclic Aromatic Hydrocarbon

PC Parish Council

PCB Polychlorinated biphenyl

PEIR Preliminary Environmental Information Report

PEMP Project Environmental Management Plan

PFRA Preliminary Flood Risk Assessment

PICP Pollution Incident Control Plan

PILs Persons with an interest in land

PINS Planning Inspectorate

PM2.5 Particulate matter of size fraction approximating to

<2.5mm diameter.

PM10 Particulate matter of size fraction approximating to

<10mm diameter.

PPA Planning Performance Agreement

PPG Pollution Prevention Guidance

PPS Planning Policy Statement

PPV Peak Particle Velocity

PRA Preliminary Risk Assessment

PRoW Public Rights of Way

PWS Private Water Supplies

RBMP River Basin Management Plan

RCS Route Corridor Study

RFC Ratio of highway flow to capacity

RIGS Regionally Important Geological Site


RPG Registered Park and Garden

rpm Revolutions per Minute

RSPB Royal Society for the Protection of Birds

RTPI Royal Town Planning Institute

SAC Special Area of Conservation

SAGE Stakeholder Advisory Group on EMFs

SCC Somerset County Council

SDC Sedgemoor District Council

SEC Sealing End Compound

SERC Somerset Environmental Records Centre

SF6 Sulphur Hexafluoride Gas

SFRA Strategic Flood Risk Assessment

SIC Standard Industrial Classifications - a system for

classifying industries

SGC South Gloucestershire Council

SGT Super Grid Transformer

SHETL Scottish Hydro Electric Transmission Ltd

SINC Site of Importance for Nature Conservation

SLA Special Landscape Area

SLCA Sub-landscape Character Area (see LCA)

SM Scheduled Monument

SMP Soil Management Plan

SNCI Site of Nature Conservation Interest

SOA Super Output Area

SoCC Statement of Community Consultation

SoCG Statement of Common Ground

SoS Secretary of State

SOR Strategic Optioneering Report

SPA Special Protection Area

SPG Supplementary Planning Guidance Document

SPT Scottish Power Transmission

SPZ Source Protection Zone

SQSS Security and Quality of Supply Standard

SRN Strategic Road Network

SSA Substation Siting Appraisal

SSS Substation Siting Study

SSSI Site of Special Scientific Interest

STW Sewage Treatment Works

SuDS Sustainable Drainage Systems (SuDS)

SWMP Site Waste Management Plan


SWT Somerset Wildlife Trust

TA Transport Assessment

TAR Transmission Access Review

TEP The Environment Partnership

TMG Traffic Management Group

TPH Total Petroleum Hydrocarbon

TPO Tree Preservation Order

TTM Temporary Traffic Management

UK-AIR UK Air Information Resource

UKBAP UK Biodiversity Action Plan

UKCP09 UK Climate Projections (2009)

UG Underground

UHV Ultra High Voltage

UK United Kingdom

UNWTO United Nations World Tourism Organisation

VAr Volt amperes reactive

VOC Volatile Organic Compounds

V The unit of electrical voltage, symbol V

Volt per metre The unit of electric field (electric stress or voltage

gradient).

VP Vantage Point

VSC Voltage Source Converters

WFD The Water Framework Directive

WHO World Health Organisation

WMP Waste Management Plan

WNS Wildlife Network Site

WPD Western Power Distribution

WSC West Somerset Council

WWT Wildfowl and Wetland Trust

WWTW Waste Water Treatment Works

XLPE Cross Linked Polyethylene: Insulation material used on

underground cables

ZTV Zone of Theoretical Visibility


Term Definition

Abnormal Indivisible

Loads (AIL)

A vehicle that has any of the following characteristics

constitutes an ‘abnormal load’: a weight of more than 44,000

kilograms; an axle load of more than 10,000 kilograms for a

single non-driving axle and 11,500 kilograms for a single

driving axle; a width of more than 2.9 metres; or a length of

more than 18.65 metres. Abnormal loads which are to be

delivered to the site are AIL when by their nature they cannot

be broken down into smaller, multiple deliveries.

Adit An entrance to an underground mine which is horizontal or

nearly horizontal.

Agricultural Land

Classification (ALC)

The Department for the Environment, Food and Rural Affairs

classifies all agricultural land in England and Wales according

to its quality and agricultural versatility. The classifications

range from grade 1, through grades 2, 3a, (the best and most

versatile) 3b, 3c and 4 down to grade 5 (the least versatile).

Agricultural Liaison

Officers (ALO)

Person(s) responsible, during the construction of the Proposed

Development, for ensuring that soil handling and traffic

movements occur in acceptable conditions.

Alluvium

These deposits consist of soft to firm consolidated,

compressible clay and silt with sand and basal gravel. Peat

deposits may occur. A stronger, desiccated surface zone may

be present.

Alternating Current (AC) Electrical circuits where the voltage and current alternate

direction, in the UK at 50 times per second (50 hertz or Hz).

Ambient Noise Background noise level in a given situation at a given time

usually composite of sounds from many sources near and far.

Amp Ampere - Unit of electrical current.

Ancient Woodlands

Ancient Woodlands are those which have had continuous

woodland cover since 1600AD to the present day. Clearance at

some time for underwood or timber production does not

exclude a wood from this category.

Angle / Deviation Tower

Tower where a horizontal insulators string attaches the

conductors. Deviation or ‘angle’ towers are used at points

where the overhead line route changes direction.

Annual Average Daily

Traffic Flow (AADT)

24 hour traffic count data averaged for all the days in the year

i.e. the total traffic flow on a road for a year divided 365.

Annual Average

Weekday Traffic Flow

(AAWT)

24 hour traffic count data averaged for just the weekdays

(Monday to Friday).

Application Regulations The Infrastructure Planning (Applications: Prescribed Forms

and Procedure) Regulations 2009.

Appropriate Assessment

(AA)

Within Habitats Regulations Assessment (HRA), Appropriate

Assessment is the second stage of the assessment process to

assess potential impacts of a plan, programme or project,

alone or in-combination, on the integrity of a Natura 2000 site

(i.e. SPA, SAC and/or Ramsar site). Unlike the initial stages of

Environmental Impact Assessment (EIA) which consider

impacts prior to mitigation, AA takes mitigation into account.

See also ‘HRA’.

Archaeological Clerk of

Works (ACOW)

Responsible for overseeing the implementation of the

Archaeological Written Scheme of Investigation.


Area of Great Landscape

Value (AGLV)

Areas designed to conserve the natural beauty of landscapes

of County importance.

Area of Outstanding

Natural Beauty (AONB)

Formally designated under the National Parks and Access to

the Countryside Act of 1949 to protect areas of the countryside

of high scenic quality that cannot be selected for National Park

status due to their lack of opportunities for outdoor recreation

(an essential objective of National Parks).

Associated Development

Development which forms part of the Hinkley Point C

Connection project but does not fall within the definition of a

Nationally Significant Infrastructure Project (NSIP).

Automatic Traffic

Counter (ATC)

An automatic counter which records the total number of

vehicles passing along a designated road or highway,

calculating a vehicle's speed and category.

Bedrock Geology

Term used for the main mass of rock forming the Earth’s crust

and present everywhere, whether exposed at the surface in

outcrops or concealed beneath superficial deposits.

Biodiversity Action Plan

(BAP)

An agreed plan for habitat or species, which forms part of the

UK commitment to biodiversity. Further information is provided

on the BAP website http://www.ukbap.org.uk.

Borehole Survey

Used to determine soil and ground suitability for directional

drilling and tower foundations and to survey the borehole to

determine its course and end point for Horizontal Directional

Drilling (HDD).

Busbar The common connection point of two or more transmission

circuits.

Cable An insulated conductor designed for underground installation.

The California Bearing

Ratio (CBR)

A penetration test for evaluation of the mechanical strength of

road sub-grades and base courses. The test is performed by

measuring the pressure required to penetrate a soil sample

with a plunger of standard area.

Carboniferous

The Carboniferous is a geological period and system that

extends from about 358.9 million years ago, to about 298.9

million years ago.

Carcinogen Is any substance that is an agent directly involved in causing

cancer.

Catchment

An area that serves a river with rainwater. Every part of land

where the rainfall drains to a single watercourse is in the same

catchment.

Catchment Abstraction

Management Strategy

(CAMS)

A strategy developed by the Environment Agency to help

identify where the amount of water abstracted or licensed

exceeds the available water in a catchment.

Catchment Flood

Management Plan

(CFMP)

A large scale planning framework for managing flood risk to

people and the developed and natural environment.

Chainages

The distance of any point along a line (road, watercourse or

utility route) is denoted by its chainage, being its distance,

measured along the centre line, from a chosen origin or start

point of the road. The name ‘chainage’ has historical

connotations based on a technique of measurement where

steel chains of 100 links were once used to measure distances.

Combined Cycle Gas

Turbine (CCGT)

A generator comprising a gas turbine together with a steam

boiler and steam turbine utilising the waste heat from the gas

turbine thereby achieving high efficiency.


Conductor Wire strung between pylons, used for transmitting electricity.

Conservation Area

An area designated for its special architectural or historic

interest, where it is desirable to preserve or enhance its

character or appearance.

Consultation Response A response received during a formal stage of consultation on

the project.

Consultation Strategy A strategy setting out National Grid's approach to and

programme of public consultation.

Construction Bellmouth

A junction between a construction access road and the public

highway designed to permit safe ingress and egress from the

construction site in accordance with highway design

standards.

Construction

Environmental

Management Plan

(CEMP)

Outlines how environmental issues that arise as result of the

construction of the Proposed Development will be handled to

ensure compliance with relevant legislation.

Contaminated Land

Report 11 (CLR11)

Model procedures for the Management of Land Contamination

(CLR 11) have been developed by the Environment Agency to

provide the technical framework for applying a risk

management process when dealing with land affected by

contamination.

Converter Station Part of an HVDC system which either converts AC electricity to

DC or converts DC electricity to AC.

Corona Breakdown of the air, e.g. on the surface of a high-voltage

conductor, to produce air ions

Crushed Aggregate Surface layer of an access track/ hardstanding areas.

Current Source

Conductor (CSC)

A type of HVDC converter which uses electronic switches that

can be controlled on, and naturally commutate off at the end of

each cycle.

Cable circuit

(underground)

Discrete electrical connection between two points on an

electricity network.

Cable route

(underground)

The length, measured in miles, of the cable route which

connects two or more points on a transmission system,

irrespective of the number of circuits of which the line is

comprised.

Cable Sealing End

Compound (CSE)

Electrical infrastructure used as the transition point between

overhead lines and underground cables. A compound on the

ground acts as the principal transition point.

Cable Sealing End Pylon

Platform (CSEPP)

Electrical infrastructure used as the transition point between

overhead lines and underground cables. A platform on the

pylon acts as the principal transition point.

Culvert A channel or pipe that carries water below the level of the

ground.

Cumulative Effects

The assessment of the impact on the environment which

results from the incremental impact of an action when added

to other past, present or reasonably foreseeable actions

regardless of what agency or person undertakes such actions.

Cumulative impact can result from individually minor but

collectively significant actions taking place over a period of

time.

Current

The flow of electricity. A voltage will always try to drive a

current. The size current that is driven depends on the

resistance of the circuit.


dB LA

The dB LA figure (where dB is decibels a relative unit of

measurement widely used in acoustics, electronics and

communications and LA is the sound weighting level assessing

the level of sound received) is used to relate the loudness of

the sound heard. The dB LA figure corrects the variation in the

ear’s ability to hear different frequency and provides a good

representation of how loud sound is received.

Department for the

Environment, Food and

Rural Affairs (DEFRA)

The UK government department responsible for policy and

regulations on environmental, food and rural issues.

Designated Area Area designated and protected by national or international law

for its landscape, biodiversity, or historic interest.

Designated Heritage

Asset

A world heritage site, scheduled monument, listed building,

protected wreck site, registered park and garden, registered

battlefield or conservation area designated under the relevant

legislation.

Design Manual for

Roads and Bridges

(DMRB)

The Department for Transport publication which provides

official standards, advice notes and other documents relating

to the design, assessment and operation of trunk roads

including motorways in the UK.

Department for

Transport (DfT)

The government department responsible for the English

transport network and a limited number of transport matters in

Scotland, Wales and Northern Ireland which are not devolved.

Direct Current (DC) Electrical circuits where the electricity flows in the same

direction all the time.

Draft Development

Consent Order (DCO)

A DCO is the legal instrument by which the Secretary of State

grants consent for development under the Planning Act (2008)

(as amended).

Drainage Management

Plan (DMP)

Identifies all known risks to the water environment and

identifies appropriate use of control measures to protect it from

sources of pollution during construction.

Dust

The Institute of Air Quality Management guidance considers

the term ‘dust’ to refer to all airborne particulate matter (i.e.

Total Suspended Particles, also known as TSP). Note: this is

different to the definition given in BS 6069, where dust refers to

particles up to 75µm.

Dynamic Cone

Penetrometer (DCP)

An in situ test in which a weight is manually lifted and dropped

on a cone which penetrates the ground. The number of

millimetres (mm) per hit are recorded and this is used to

estimate certain soil properties. This is correlated against

California Bearing Ration (CBR) values.

Earth Wire

Wire strung between the tops of towers used for lightning and

system protection. May also be used to carry

telecommunication signals.

Easement

An easement is a right benefiting a piece of land (known as the

dominant land) that is enjoyed over another piece of land

owned by someone else (the servient land). Usually, an

easement allows the owner of the dominant land to do

something on the servient land, such as use a right of way, or

run services over it.

Ecological Clerk of

Works (ECOW)

Suitably qualified person responsible for the planning and

implementation of works on site.


EDF Energy The UK subsidiary of EDF Group, is one of the UK's largest

energy companies and the UK's largest producer of electricity.

EIA Regulations Infrastructure Planning (Environmental Impact Assessment)

Regulations 2009.

Electric Field

An electric field is the region around a conductor where a force

will be experienced by a charge. An electric field is produced

by a voltage.

Electrical Safety

Clearances

Specified minimum safety clearances that must be maintained

between overhead lines and things such as the ground,

obstacles, buildings, roads, railways and other power lines.

Electricity Lines Either an overhead line or an underground cable used to

transmit electricity.

Electromagnetic

Compatibility

The ability of a device, equipment or system to function

satisfactorily in its electromagnetic environment without

introducing intolerable electromagnetic disturbance to anything

in that environment.

Electromagnetic Forces

The fundamental force that is associated with electric and

magnetic fields and is responsible for atomic structure,

chemical reactions, the attractive and repulsive forces

associated with electrical charge and magnetism, and all other

electromagnetic phenomena.

Electromagnetic

Radiation

High frequency visible light or radio waves emitted by spark or

corona discharges from high voltage conductors and fittings.

Emergency Response

Plan for Flood Events Details the emergency procedures in the event of a flood.

Emergency Response

Plan for Unexploded

Ordnance

Describes the procedure to be followed in the discovery of

unexploded ordnance.

Environmental Agency

(EA)

The Environment Agency was established in 1996 as a non-

departmental public body of the Department for Environment,

Foor and Rural Affairs covering England and Wales. Since 2013

its remit has extended to England only.

Environment Agency

Flood Zone Map

Environment Agency map that delineates the areas that have

been predicted to be at risk of being flooded during an event of

specified probability (i.e. Flood Zone 1, 2, 3a or 3b).

Environmental Impact

Assessment (EIA)

A method or procedure for predicting the effects on the

environment of a proposal, either for an individual project or a

higher – level ‘strategy’ (a policy, plan or programme) with the

aim of taking account of these effects in decision making. The

term Environmental Impact Assessment (EIA) is used as in

European Directive 337/85/EEC, for assessments of projects.

Environmental

Protection UK (EP UK)

Environmental Protection UK is a national charity that provides

expert policy analysis and advice on air quality, land quality,

waste and noise and their effects on people and communities

in terms of a wide range of issues including public health,

planning, transport, energy and climate.

Environmentally

Sensitive Area (ESA)

A designation of an agricultural area which needs special

protection because of its landscape, wildlife or historical value.


Equivalent Continuous

Sound Level (Leq)

Equivalent continuous sound level is a notional steady sound

level that causes the same A-weighted sound energy to be

received as that due to the actual and possibly fluctuating

sound over a period of time T. It can also be used to relate

periods of exposure and noise level. For example, halving or

doubling the period of exposure is equivalent in sound energy

to a decrease or increase of 3dB(A) in the sound level for the

original period.

Extremely Low

Frequency A radio frequency or radio-frequency band below 3 kilohertz.

Fauna All of the animals in a given area.

Flood Defence

Infrastructure used to protect an area against floods, such as

floodwalls and embankments. Flood Defences are designed to

provide a certain standard of protection (design standard).

Floodplain Area adjacent to river, coast or estuary that is naturally

susceptible to flooding.

Flood Risk Assessment

(FRA)

A flood risk assessment is an assessment of the risk of

flooding, particularly in relation to residential, commercial and

industrial land use. In England and Wales, the Environment

Agency requires a Flood Risk Assessment (FRA) to be

submitted alongside planning applications in areas that are

known to be at risk of flooding (within flood zones 2 or 3) and/

or are greater than 1ha in area.

Flood Storage An area that temporally stores excess runoff or river flow; often

ponds or reservoirs.

Flora All of the plants in a given area.

Fluvial Flooding Flooding by a river or a watercourse.

Frequency Weighting

Networks

Frequency weighting networks, which are generally built into

sound level meters, attenuate the signal at some frequencies

and amplify it at others. The A-weighting network

approximately corresponds to human frequency response to

sound. Sound levels measured with the A-weighting network

are expressed in dB(A). Other weighting networks also exist,

such as C-weighting which is nearly linear (i.e. unweighted) and

other more specialised weighting networks. Variables such as

Lp and Leq that can be measured using such weightings are

expressed as LpA / LpC, LAeq / LCeq etc.

Functional Floodplain

(Flood Zone 3b)

This zone comprises land where water has to flow or be stored

in times of flood. The land would flood with an annual

probability of 1 in 20 (5%) or greater in any year or is designed

to flood in an extreme (0.1%) flood.

Geoarchaeology The application of earth science principles and techniques to

the understanding of the archaeological record.

Gigawatt (1000 million

Watts) (GW)

The gigawatt (GW) is equal to one billion (109) watts or 1

gigawatt = 1,000 megawatts (MW).

GLVIA and GLVIA3

The ‘Guidelines for Landscape and Visual Impact Assessment

– Third Edition’, Landscape Institute and Institute of

Environmental Management and Assessment, 2013.

Grid Supply Point (GSP)

A substation forming part of the national electricity

transmission system, which supplies electrical power to a

Distribution Network Operator or other directly connected

customer.

Gross Economic Spend Combined amount of all expenditures.


Gross Value Added A measure in economics of the value of goods and services

produced in an area, industry or sector of an economy.

Groundwater Water that is in the ground, this is usually referring to water in

the saturated zone below the water table.

Head Deposits

These deposits are defined as derived from the slow,

gravitationally driven, down slope movement of water-

saturated, seasonally thawed materials and comprise poorly

sorted and poorly stratified deposits.

Habitat The natural home or environment of an animal, plant, or other

organism.

Habitat Regulations

Assessment (HRA)

Assessment pursuant to the Conservation Natural Habitat and

Special Regulations 2010, which provide for the protection of

European Sites, Special Areas of Conservation (habitats) and

Special Protection Areas (birds).

Haul Road A road built to carry heavily loaded trucks at a good speed.

Heritage Asset

A building, monument, site, place, area or landscape identified

as having a degree of significance meriting consideration in

planning decisions, because of its heritage interest. Heritage

asset includes designated heritage assets and assets identified

by the local planning authority (including local listing).

Hertz The unit of frequency, symbol is Hz, 1 Hz = 1 cycle per second.

High Voltage

275,000 volts and over. National Grid’s transmission lines

generally operate at 275,000 and 400,000 volts. Lower voltage

line, such as 132,000 volts and 33,000 volts are generally

owned by local distribution companies.

Highways Agency (HA) An executive agency of the Department for Transport in

England.

Hinkley Point C

Connection Project

The proposed development including the overhead line,

underground cables and all associated development.

Hinkley Point A power

station Hinkley Point A Nuclear Power Station.

Hinkley Point B power

station Hinkley Point B Nuclear Power Station.

Hinkley Point A and

Hinkley Point B together The existing Hinkley Point Nuclear Power Station Complex.

Hinkley Point C power

station The proposed Hinkley Point C Nuclear Power Station.

Historic Environment

All aspects of the environment resulting from the interaction

between people and places through time, including all

surviving physical remains of past human activity, whether

visible, buried or submerged, and landscaped and planted or

managed flora.

Historic Environment

Record (HER)

Information services that seek to provide access to

comprehensive and dynamic resources relating to the historic

environment of a defined geographic area for public benefit

and use.

Historic Landscape

Characterisation

A method of identifying the historic landscape character of the

present-day landscape, defining the landscape through a

series of attributes, primarily the morphology of field

boundaries, as well as processes of enclosure and

measurement of past landscape changes.


Historic/non-operational

landfill

Locations where there are records of waste being received to

be buried but are now closed or covered. The information held

is collated from data held by Local Authorities, the former

Department of the Environment, British Geological Society and

Environment Agency suspended authorised landfill licences.

Holford Rules

The “Holford Rules” are a series of overhead line routeing

guidelines first developed in 1959 by Lord Holford, adviser to

the then Central Electricity Generating Board on amenity

issues. They were reviewed in the 1990s by National Grid. The

rules are not published as a single work but they are referred to

in a number of planning publications including Visual Amenity

Aspects of High Voltage Transmission by George A. Goulty

(1989) and Planning Overhead Power Line Routes by RJB

Carruthers (1987) Research Studies Press Ltd, Letchworth.

Immiscible Pollutants

Pollutants that cannot be mixed in all proportions and remain

separate. Examples include, Benzene (petrol) and Butyl alcohol

(component of hydraulic and brake fluid). For the purpose of

the Environmental Statement, the pollutant must be immiscible

in water.

Impact Magnitude

This is the scale of change which a given impact may cause.

This is compared to the baseline state and consideration is

given to how the change relates to accepted thresholds and

standards.

Impact Significance The level of significance is defined by the magnitude of impact

in relation to the sensitivity/value of the environmental receptor.

Induced Spend

Additional expenditure brought to the local economy through

contractors and others employed through the Proposed

Development.

Interbedded

In geology, interbedding occurs when beds (layers of rock) of a

particular lithology lie between or alternate with beds of a

different lithology.

Internal Drainage Board

(IDB)

A type of operating authority which is established in areas of

special drainage need in England and Wales with permissive

powers to undertake work to secure clean water drainage and

water level management within drainage districts.

Inundation Flooding.

Invertebrates Animals without backbones.

Insulator Used to attach the conductors to the towers preventing

electrical discharge to the steelwork.

Jurassic The Jurassic is a geological period and system that extends

from 201.3 million years ago to 145 million years ago.

kWh

The quantity of energy delivered by a 1 kilowatt (1000watt) flow

of power for 1 hour. A kettle of power rating 2kW, left used for

a period of 1 hour continuously would use 2kWh of energy.

kWh is also the “unit” used for the purposes of domestic

billing.

Landscape Character

A distinct, recognisable and consistent pattern of elements in

the landscape that makes one landscape different from

another.


Landscape Character

Assessment

A systematic process of analysing and describing variation in

the character of the landscape, and using this information to

assist in managing change in the landscape. Landscape

character assessment seeks to identify and explain the unique

combination of elements and features that make landscapes

distinctive.

Landscape Character

Type

Distinct types of landscape that are relatively homogenous in

character.

Landscape Elements Individual components which make up the landscape, such as

trees and hedges.

Landscape Receptor Defined aspects of the landscape resource that have the

potential to be affected by the Proposed Development.

Lead Local Flood

Authority (LLFA)

Responsible for developing, maintaining and applying a

strategy for local flood risk management in their areas and for

maintaining a register of flood risk assets. They also have lead

responsibility for managing the risk of flooding from surface

water, groundwater and ordinary watercourses.

Light Goods Vehicles

(LGV)

Vehicles which are smaller delivery vans, pickups, 4x4s and

cars with a maximum gross weight of 3.5 tonnes.

Light Detection and

Ranging (LiDAR)

A technique for detecting slight morphological changes, and in

favourable circumstances capable of locating buried

archaeological features, palaeochannels etc. as well as

providing detailed photogrammetric records of buildings etc.

Lighting Scheme Identifies the detail of the location, type and use of lighting at

the construction site.

Limits of Deviation (LoD)

Following the approach known as the “Rochdale Envelope”

(Planning Inspectorate: Advice Note 9) the limits of deviation

identify a maximum distance or measurement of variation

within which the works must be constructed. This approach

provides a necessary and proportionate degree of flexibility as

to the final alignment of the works.

Listed Buildings

Buildings and structures which have been identified as being of

special architectural or historical interest whose protection and

maintenance are the subject of special legislation. Buildings

are listed by grade - Grade I buildings are of exceptional

interest, sometimes considered to be internationally important

- Grade II* buildings are particularly important buildings of

more than special interest; Grade II buildings are nationally

important and of special interest.

Lithology

The lithology of a rock unit is a description of its physical

characteristics visible at outcrop, in hand or core samples or

with low magnification microscopy, such as colour, texture,

grain size, or composition.

Local Development

Framework (LDF)

Local Authority documents containing planning policies for the

district.

Local Landscape

Character Area (LLCA)

Identified within a Landscape Character Assessment available

from the relevant Local Planning Authority.

Local Planning Authority

(LPA)

The level of Government responsible for planning within a

given administrative area. Within the study area this is Bristol

City Council, North Somerset Council, Sedgemoor District

Council, Somerset County Council, South Gloucestershire

Council and West Somerset Council.

Made Ground Man-made superficial deposit of variable compaction.


Main River

Main rivers are a statutory type of watercourse

in England and Wales, usually larger streams and rivers, but

also include some smaller watercourses. A main river is

defined as a watercourse marked as such on a main river map,

and can include any structure or appliance for controlling or

regulating the flow of water in, into or out of a main river.

Magnetic Fields

Magnetic Fields are produced by the flow of electrical current.

It is a measure of the force experienced by a moving electric

charge, due to the motion of other charges.

Maximum Sound

Pressure Level or

Maximum Noise Level

(Lmax)

This is the maximum Root Mean Square sound pressure level

occurring within a specified period. The time weighting is

usually specified, such as in Lfmax.

Microshock

Small discharges sometimes experienced when touching a

metal object in an electric field, similar to touching a filing

cabinet or door knob after walking across a nylon carpet.

Microtesla (µT) Unit of magnetic field strength that is 1/1,000,000 of a Tesla.

Mineral Planning

Authority

The Minerals Planning Authority is part of the planning group or

county development unit of the Local Authority.

Miscible Pollutants

Pollutants that can be mixed in all proportions, including,

Methyl alcohol (anti-freeze in vehicle washer fluid) and

Isopropyl alcohol (de-icer). For the purpose of the

Environmental Statement, the pollutant must be miscible in

water.

Mitigation

Measures which are incorporated into the design or

implementation of a development project for the purpose of

avoiding, reducing, remedying or compensating for its adverse

environmental impacts. It may also include measures to

provide environmental benefits.

MMG Weathering Zone I

Mercia Mudstone Group weathering scheme for the MMG after

Chandler. Unweathered rock comprising mudstone (often

fissured).

MMG Weathering Zone II


Chandler. Partially weathered rock comprising angular blocks

of unweathered mudstone with virtually no matrix.

MMG Weathering Zone

III


Chandler. Partially weathered rock comprising matrix with

frequent lithorelics up to 25mm-diameter. As weathering

progresses lithorelics become less angular.

MMG Weathering Zone

IVa


Chandler. Partially weathered rock comprising matrix with

occasional clay-stone pellets less than 3mm-diameter but

more usually coarse sand size.

MMG Weathering Zone

IVb


Chandler. Fully weathered rock comprising matrix only.

National Grid

National Grid operate the national electricity transmission

network across Great Britain and own and maintain the

network in England and Wales, providing electricity supplies

from generating stations to local distribution companies. It

does not distribute electricity to individual premises, but its role

in the wholesale market is vital to ensuring a reliable, secure

and quality supply to all.


Natura 2000 Network of nature protection areas established under the 1992

Habitats Directive (includes SPA, SAC, Ramsar sites).

Natural England

A Government Agency promoting the conservation of

England’s wildlife and natural features and responsible for

designating National Nature Reserves, identifying Sites of

Special Scientific Interest and for advising a wide range of

bodies and individuals including the Government on matters

affecting Nature Conservation.

National Character Areas

(NCA's)

NCAs divide England into 159 distinct natural areas. Each is

defined by a unique combination of landscape, biodiversity,

geodiversity and cultural and economic activity. Their

boundaries follow natural lines in the landscape rather than

administrative boundaries, making them a good decision

making framework for the natural environment.

National Nature Reserve

(NNR)

NNRs are designated under the National Parks and Access to

the Countryside Act 1949 or the Wildlife and Countryside Act

1981 (as amended) primarily for nature conservation, but can

also include sites with special geological or physiographic

features. They were established to protect the most important

area of wildlife habitat and geological formations in Britain, and

as places for scientific research. All NNRs receive SSSI

designation under the Countryside and Rights of Way Act 2000

and the Wildlife and Countryside Act 1981 (as amended).

Net Additional

Expenditure

This is the gross expenditure associated with the Proposed

Development minus expenditure that would have been

invested in the area if the Proposed Development had not

progressed.

National Electricity

Transmission System

Security and Quality of

Supply Standard (NETS

SQSS)

The NETS SQSS sets out a coordinated set of criteria and

methodologies that the Transmission Licensees shall use in the

planning and operation of the national electricity transmission

system.

Non-Aquifer These are rock layers or drift deposits with low permeability

and negligible significance for water supply or river base flow.

Non-prescribed

Consultees

Additional consultees, not required to be consulted under the

Planning Act 2008.

National Vegetation

Classification (NVC)

NVC is a key common standard developed for the country

nature conservation agencies which aims to produce a

comprehensive classification and description of the plant

communities of Britain, each systematically named and

arranged with standardised descriptions for each.

Ordance Datum (OD) A vertical datum point used by the OS as a reference point for

the level or altitude of any point.

Order Limits The maximum extent of land in which the Proposed

Development may take place.

Ordinary Watercourse

Ordinary Watercourses are a statutory type of watercourse in

England and Wales. Ordinary watercourses include

every river, stream, ditch, drain, cut, dyke,

rhyne, sluice, sewer (other than a public sewer) and passage

through which water flows and which does not form part of

a main river.


Outage

The withdrawal from service of any part of the transmission

system for a period of time in connection with repair,

maintenance, or construction of the transmission system.

Outcrop A proportion of bedrock or other stratum protruding through

the soil level.

Outline Archaeological

Written Scheme of

Investigation (WSI)

Sets out the steps that need to be taken to mitigating the

predicted effects on archaeology, geo-archaeology and

historic landscape heritage assets.

Overhead Line Conductor (wire) carrying electric current, strung from pylon to

pylon.

Palaeo-environmental

Archaeology

The study of past human economy and environment using

earth and life sciences. It tells us about ecological, cultural,

economic, and climate change.

Peak Flow The highest number of vehicles in a certain flow during a given

scenario.

Peak Particle Velocity

(PPV)

The peak velocity of a particle in a medium as it transmits a

wave. Not to be confused with the speed of wave propagation

in a medium.

Peat These deposits comprise peat and are described as organic-

rich clay and humic deposits.

Percentile or Statistical

Levels (LN)

Calculation of the noise level which is exceeded for a certain

percent of a total period. Background noise is often defined as

the A-weighted sound pressure level exceeded for 90% of the

specified period T, expressed L90,T. Road traffic noise is often

characterised in terms of LA10,18h.

Persons with an interest

in land (PILs)

Persons with an interest in land which is the subject of the

Development Consent Order (DCO) (within Category 1, 2 or 3

as set out in section 44 of the Planning Act 2008.

Phase One Habitat

Survey

The Phase 1 habitat classification and associated field survey

technique provides a relatively rapid system to record semi-

natural vegetation and other wildlife habitats. Each habitat

type/feature is defined by way of a brief description and is

allocated a specific name, an alpha-numeric code, and unique

mapping colour. The system has been widely used and

continues to act as the standard ‘phase 1’ technique for

habitat survey across the UK.

Pollution Incident

Control Plan (PICP)

Identifies how the risk of pollution due to construction works,

materials and extreme weather events will be controlled and

identifies the remedial actions in the event of an incident.

Piling

The installation of bored and driven piles and the effecting of

ground treatments by vibratory dynamic and other methods of

ground stabilisation.

Planning Act 2008

The Act which governs the determination of applications for

consent for Nationally Significant Infrastructure Projects

(NSIPs).

Pluvial Flooding Flooding that results from rainfall-generated overland flow,

before the runoff enters any watercourse or sewer.

Principal Aquifer

These are layers of rock or drift deposits that have high

intergranular and/or fracture permeability - meaning they

usually provide a high level of water storage. They may support

water supply and/or river base flow on a strategic scale. In

most cases, principal aquifers are aquifers previously

designated as major aquifer.


Prescribed Consultees

Persons and organisations required to be consulted about the

project under sections 42, 43 and 44 of the Planning Act 2008

and set out in Schedule 1 of the Infrastructure Planning

(Applications: Prescribed Forms and Procedure) Regulations

2009.

Project Environmental

Management Plan

(PEMP)

Details the environmental mitigation measures that will be

implemented during each stage of the construction works and

must be in accordance with the CEMP.

Proposed Development The Hinkley Point C Connection Project.

Public Rights of Way

(PRoW)

A footpath, bridleway or restricted byway on which the public

have a legally protected right to pass and re-pass.

Public Rights of Way

Management Plan

Describes where the PRoW will be affected and how the PRoW

will be managed, to ensure they are safe to use and the

disruption to the users of the PRoW is minimised.

Private Water Supplies

(PWS)

Individual water systems, generally wells and springs, serving

one or several residences.

Pylon Overhead line structure used to carry overhead electrical

conductors, insulators and fittings.

Radio Frequency Frequencies much higher than power frequencies, where radio

and TV broadcasts and mobile phones operate.

Radio Frequency

Interference

Any electromagnetic phenomenon, which may degrade the

performance of equipment in the radio spectrum. An

electromagnetic disturbance may be electromagnetic noise, an

unwanted signal or a change in the propagation medium itself.

Ramsar Wetlands of international importance, designated under the

Ramsar Convention.

Receptor

The physical resource or user group that would respond to an

effect e.g. somebody or something adversely affected by a

pollutant.

Refurbishment The replacement of old conductors (wires), insulators,

earthwires, etc on a existing overhead line.

Registered Battlefield A site included on a register held by English Heritage because

of its historical significance and location.

Registered Park and

Garden

A site included on a register held by English Heritage by virtue

of its special historic interest. Registered Parks and Gardens

may be Grade I (“exceptional interest”), Grade II* (“particularly

important, of more than special interest”) or Grade II (“of

special interest, warranting every effort to preserve them”).

Registered Waste Carrier

The Control of Pollution (Amendment) Act 1989 and the

Controlled Waste (Registration of Carriers and Seizure of

Vehicles) Regulations 1991 require that any person who

transports/makes arrangements for management of waste in

the course of any business without being registered with the

appropriate registration authority commits an offence, unless

they are exempt.

Representative

Viewpoints

Representative viewpoints, as defined by GLVIA3, are selected

to represent the experience of different types of visual

receptor, where larger numbers of viewpoints cannot all be

included individually and where the significant effects are

unlikely to differ.

Residual Effects

Effects of construction, operation and decommissioning of the

Proposed Development after mitigation measures have been

applied.


Residual Impact The perceived impact(s) to a receptor after mitigation and

management measures have been implemented.

Rhyne / Rhine

The local name in Somerset (rhyne) and Gloucestershire (rhine)

for a drainage ditch used for water management in low lying

agricultural areas, that usually has water in it at all times.

River Basin Management

Plan (RBMP)

A requirement of the Water Framework Directive and a means

of achieving the protection, improvement and sustainable use

of the water environment across Europe. This includes surface

freshwaters (including lakes, streams and rivers), groundwater,

ecosystems such as some wetlands that depend on

groundwater, estuaries and coastal waters out to one nautical

mile.

River Terrace Deposits

Bench or step that extends along side of a valley and

represents a former level of the valley floor. A terrace results

from any hydrological or climatic shift that causes renewed

downcutting. The deposits left by this process comprise sand

and gravel clay, silt, sand and gravel, locally with lenses of

clay, silt or peat.

Route Corridor Study

(RCS)

An appraisal of the high level planning and environmental

constraints to identify potential route corridor options within a

defined study area.

Route Corridor A broad swathe of land within which a new electricity

transmission connection could be routed.

Safety, Health and

Environmental (SHE)

Plan

Details relevant safety, health and environmental information

relating to all land within a construction site.

Secondary A Aquifer

A secondary A aquifer comprises permeable layers capable of

supporting water supplies at a local level rather than strategic

scale, and in some cases forming an imported source of base

flow to rivers (formerly minor aquifers).

Secondary B Aquifer

A secondary undifferentiated aquifer comprises predominantly

lower permeability layers which may store/yield limited

amounts of groundwater due to localised features such as

fissures, thin permeable horizons and weathering. These are

generally the water-bearing parts of the former non-aquifers.

Secondary

Undifferentiated Aquifer

A secondary undifferentiated aquifer is the classification

assigned to an aquifer where it is not possible to attribute

either category A or B to a rick type. In general these layers

have been previously designated as minor and non-aquifers in

different locations due to the variable characteristics of the

rock type.

Section

‘Sections’ have been identified along the route of the 400kV

connection from Bridgwater to Seabank based on areas of

similar landscape character (Sections A-G inclusive). An

additional Section has been defined based on the area of

works for the Hinkley Line Entries (Section H).

Section 42 (of the

Planning Act 2008) s42

Section of the Planning Act 2008 requiring consultation of

specifically identified groups.

Section 42 consultees

(s42 consultees) Statutory stakeholders as defined by the Planning Act 2008.


Section 47 (of the

Planning Act 2008) (s47)

Section of the Planning Act 2008 requiring consultation of the

local community and preparation of a Statement of Community

Consultation setting out how such consultation will be

conducted.

Section 48 (of the

Planning Act 2008) (s48)

Section of the Planning Act 2008 requiring publication of

notices regarding statutory consultation.

Scheduled Monument A nationally important site or monument contained on a

schedule held by the Department for Culture, Media and Sport.

Scoping

Scoping is the process of determining the content and extent

of matters that should be covered in the environmental impact

assessment.

Sequential Test

The risk based approach for assessing flood risk presented in

National Planning Policy Framework. The Sequential Test

advocates development in areas of lowest risk first.

Sequential Views

Sequential views are views recorded along the length of public

routes identified for assessment. A description records

changes to views as the receptor travels along the identified

route.

Setting (for heritage

assets)

The surroundings in which an asset is experienced. The extent

of the setting is not fixed and may change as an asset and its

surroundings evolve. Elements of a setting may make a

positive or negative contribution to the significance of an asset,

may affect the ability to appreciate that significance or may be

neutral.

Severance The perceived division that can occur within a community

when it becomes separated by a major traffic artery.

Sites of Special

Scientific Interest (SSSI)

An area of land designated by Natural England as of special

interest by reason of its flora, fauna or geological or

physiographical features.

Soil Management Plan

(SMP)

Identifies the nature of the soil, areas of potential difficulty

arising from the nature of the soil, such as poor trafficability,

excavatability and soil handling properties. Describes how

works should be undertaken to minimise effects on the nature

and quality of the soil.

Source Protection Zone

(SPZ)

SPZs are wells, boreholes and springs that are used for public

drinking water supply. The zones show the risk of

contamination from activities that might cause groundwater

pollution in the area. The size and shape of a zone depends

upon subsurface conditions, how the groundwater is removed,

and other environmental factors.

Special Area of

Conservation (SAC)

Strictly protected sites, classified in accordance with the EC

Directive on the Conservation of Natural Habitats and of Wild

Fauna and Flora 92/43/EEC. Article 3 of the Directive requires

the establishment of a European network of important high-

quality conservation sites that will make a significant

contribution to conserving the habitats listed in Annex I and

species listed in Annex II.

Special Protection Areas

(SPA)

SPAs are strictly protected sites classified in accordance with

Article 4 of the EC Birds Directive. They are classified for rare

and vulnerable birds (as listed on Annex I of the Directive), and

for regularly occurring migratory species.

Species A group of living organisms consisting of similar individuals

capable of exchanging genes or interbreeding.


Statement of Community

Consultation (SoCC)

A statement of how consultation will be undertaken published

by National Grid prior to statutory consultation, as required by

the Planning Act 2008, and following consultation with the local

planning authorities.

Strategic Flood Risk

Assessments (SFRAs)

Strategic Flood Risk Assessments (SFRAs) are a required part

of the local planning process. SFRAs are primarily produced by

local planning authorities, in consultation with the Environment

Agency, and are intended to form the basis for preparing

appropriate policies for flood risk management at the local

level.

Stratum

In geology and related fields, a stratum is a layer of

sedimentary rock or soil with internally consistent

characteristics that distinguish it from other layers.

Statutory Undertakers Persons with regulatory powers and duties, such as gas,

electricity, water and transport providers or transmitters.

Substation

Electrical equipment in an electric power system through which

electrical energy is passed for transmission, transformation,

distribution or switching.

Superficial Geology

Superficial deposits are the youngest geological deposits

formed during the most recent period of geological time, the

Quaternary, which extends back about 2.6 million years from

the present. They rest on older deposits or rocks referred to as

bedrock or solid geology.

Super Output Area

One of a range of statistical geographies developed by the

Office for National Statistics. They are subdivided into Lower

Layer Super Output Areas and Middle Layer Super Output

Areas. They are intended to be of consistent size with stable

boundaries They were designed to improve the reporting of

small area statistics and are built up from groups of Output

Areas.

Suspended Solids Non soluble particles, such as sand grains and silt particles,

carried in suspension in water.

Syncline A structural geological feature (a fold) with the younger strata in

the centre of the structure.

Tee Point The point at which two electrical routes connect together.

Thematic Group

Groups of statutory and non-statutory consultees convened

around specific topic areas to help to shape the surveys

undertaken as part of the Environmental Impact Assessment

(EIA) and discuss their respective findings.

Tidal Flat Deposits These deposits consist of silty clays with basal gravel.

Time Weighting

Sound level meters use various averaging times for the

measurement of Route Mean Square sound pressure level. The

most commonly used are fast (0.125 s averaging time), slow (1

s averaging time) and impulse (0.035 s averaging time).

Variables that are measures with time weightings are

expressed as LAFmax etc.

Tower (pylon)

Overhead line structure used to carry overhead electrical

conductors, insulators and fittings. They are commonly known

as pylons.

Transport Assessment

(TA)

A TA is a comprehensive and systematic process that sets out

transport issues relating to a proposed development. It

identifies what measures will be taken to deal with the

anticipated transport impacts of the scheme.


Transposed /

Untransposed

Each tower contains two circuits, one on each side of the

tower. Each circuit has three ‘phases’ which are arranged

vertically. If the circuits are ‘transposed’, the phase order on

one side of the tower is the reverse of that on the other side,

(this is often referred to as optimal phasing). If the circuits are

‘untransposed’, the phase order is the same on both sides of

the tower.

Triassic The Triassic is a geologic period and system that extends from

about 250 to 200 million years ago.

Unproductive Aquifer

These are rock layers or drift deposits with low permeability

that have negligible significance for water supply or river base

flow.

Uprating Changing the capacity of existing overhead line by replacing

the existing conductors with larger capacity conductors.

Valued Views

Valued views are viewpoints at distances of over 3km from the

Limits of Deviation for the Proposed Overhead Line. Typically

valued views have been assessed from viewpoints on elevated

ground, and from visitor attractions and viewpoints such as

Glastonbury Tor.

Verified Photomontage

A visualisation which superimposes an image of a proposed

development upon a photograph or series of photographs

using a method that is able to be replicated or ‘verified’ by

others. The information required to replicate the process of

creating the visualisation is retained.

Visual Amenity The value of a particular area or view in terms of what is seen.

Visual Receptor Individuals and/or defined groups of people who have the

potential to see the Proposed Development.

Visualisation Computer simulation, photomontage or other technique to

illustrate the appearance of the Proposed Development.

Voltage The electrical potential difference between two points.

Voltage Source

Convertors

A type of HVDC converter which uses electronic switches

which can be controlled on and off.

Waste Transfer Note Describes the waste passed on, where it was passed to and to

whom it has been passed on to.

Water Framework

Directive

The Water Framework Directive (2000/60/EC) commits

European Union member states to achieve good qualitative

and quantitative status of all water bodies.

Watt The unit of electric power, product of Volts x Amperes.

Wayleaves

Annual Licence granted by the owner and occupier of land

giving National Grid the right to install, use and maintain its

equipment. Terms of the Wayleave Agreement provide for the

annual rental and compensation payments to be made.

Zone of Theoretical

Visibility (ZTV)

Digital representation of the Earth’s surface used in

determining the visibility of an object in the surrounding

landscape.


Plans & Drawings

Location Plan A plan showing the location of the proposed development.

Works Plans

A sequence of plans showing in relation to existing features the

proposed route and alignment of the development and works

and the limits of deviation within which the woks may be

carried out.

Land Affected Plans &

Land Plans

A sequence of plans showing the extent of the order limits and

identifying each numbered plot within those limits as listed in

the Book of Reference.

Special Category Land

Plans and Crown Land

Plans

A sequence of plans showing any 'special category land' that

falls within the order limits (i.e. common land, open space,

National Trust land or allotments).

Private Rights to be

Extinguished Plans

A sequence of plans showing any land in relation to which it is

proposed to extinguish easements, servitudes or other private

rights.

Access and Rights of

Way Plans and Public

Rights of Navigation

Plan Sections

A sequence of plans identifying any new or altered means of

access, stopping up of streets or roads or any diversions,

extinguishments or creation of rights of way or public rights of

navigation.

Environmental Features -

Statutory or Non-

Statutory Sites or

Features of Nature

Conservation

Plans identifying any statutory or non-statutory sites/features

of nature conservation, excluding protected habitats, and

waterbodies in river basin management plan.

Heritage Designation

Plans

Plans identifying any statutory and non-statutory sites/features

of the historic environment.

Trees and Hedges to be

Removed or Affected

Plans

Plans identifying any trees and hedges proposed to be

affected or removed as part of the works.

Design Drawings Drawings and sections showing details of design, external

appearance and preferred layout of buildings/structures.

Traffic Regulation Plans A plan identifying the traffic management for this project.


Glossary - Planning Inspectorate Biodiversity Mitigation Strategy BMV Best and Most Versatile...

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