Wey (Shalford to River Thames confluence at Weybridge) Water Body

Moderate ecological status

Attributes

  • Water Body IDGB106039017630
  • Water Body TypeRiver
  • Hydromorphological designationheavily modified
  • NGRSU9962449076
  • Surveillance Water BodyNo
  • Length46.346 km
  • Catchment area75.772 km2
  • Catchment area7577.202 ha

Classifications

Classification Item20192022
EcologicalModerateModerate
Biological quality elementsModerateModerate
FishModerateModerate
InvertebratesHighHigh
Macrophytes and Phytobenthos CombinedModerateModerate
Macrophytes Sub ElementModerateModerate
Phytobenthos Sub ElementModerateModerate
Physico-chemical quality elementsModerateModerate
Acid Neutralising CapacityHighHigh
Ammonia (Phys-Chem)HighHigh
Dissolved oxygenHighHigh
PhosphateModerateModerate
TemperatureHighHigh
pHHighHigh
Hydromorphological Supporting ElementsSupports goodSupports good
Hydrological RegimeSupports goodSupports good
Supporting elements (Surface Water)ModerateModerate
Mitigation Measures AssessmentModerate or lessModerate or less
Specific pollutantsHighHigh
ArsenicHighHigh
Chromium (VI)HighHigh
CopperHighHigh
IronHighHigh
ManganeseHighHigh
PermethrinHighHigh
ZincHighHigh
ChemicalFailDoes not require assessment
Priority hazardous substancesFailDoes not require assessment
Benzo(a)pyreneGood
Cadmium and Its CompoundsGood
Dioxins and dioxin-like compoundsGood
Heptachlor and cis-Heptachlor epoxideGood
Hexabromocyclododecane (HBCDD)Good
HexachlorobenzeneGood
HexachlorobutadieneGood
Mercury and Its CompoundsGood
Perfluorooctane sulphonate (PFOS)Fail
Polybrominated diphenyl ethers (PBDE)Fail
Tributyltin CompoundsGood
Priority substancesFailDoes not require assessment
Cypermethrin (Priority)Fail
FluorantheneGood
Lead and Its CompoundsGood
Nickel and Its CompoundsGood
Other PollutantsDoes not require assessmentDoes not require assessment

Why do all water bodies have a chemical status of fail?

Investigations into classification status

No data to show

Reasons for not achieving good (RNAG) and reasons for deterioration (RFD)

All reasons (RFDs and RNAGs) attributed to the classification elements in this water body.

Reason TypeSWMIActivityCategoryClassification ElementMore information
RNAGPoint sourceSewage discharge (continuous)Water IndustryMacrophytes and Phytobenthos CombinedDetails
RNAGPoint sourceSewage discharge (continuous)Water IndustryPhosphateDetails
RNAGUnknown (pending investigation)Unknown (pending investigation)Sector under investigationPerfluorooctane sulphonate (PFOS)Details
RNAGPhysical modificationReservoir / Impoundment - non flow relatedNavigationFishDetails
RNAGPhysical modificationInland boating and structuresNavigationFishDetails
RNAGPhysical modificationBarriers - ecological discontinuityOtherFishDetails
RNAGPhysical modificationUrbanisation - urban developmentUrban and transportFishDetails
RNAGPhysical modificationOther (not in list, must add details in comments)NavigationMitigation Measures AssessmentDetails
RNAGPhysical modificationOther (not in list, must add details in comments)Local and Central GovernmentMitigation Measures AssessmentDetails
RNAGPhysical modificationOther (not in list, must add details in comments)RecreationMitigation Measures AssessmentDetails
RNAGPhysical modificationImpoundment - u/s elevated water levelNavigationFishDetails
RNAGmeasures delivered to address reason, awaiting recoveryNot applicableNo sector responsiblePolybrominated diphenyl ethers (PBDE)Details

Reasons for not achieving good status by business sector

The issues preventing waters reaching good status and the sectors identified as contributing to them. The numbers in the table are individual counts of the reasons for not achieving good status with a confidence status of 'confirmed' and 'probable', where the latest classification is less than good status. There may be more than one reason in a single water body. Note, table does not include reasons for deterioration.

Significant water management issuePhysical modificationsPollution from waste waterPollution from towns, cities and transportChanges to the natural flow and level of waterInvasive non-native speciesPollution from rural areasPollution from abandoned mines
Agriculture and rural land management0000000
Industry0000000
Mining and quarrying0000000
Navigation2000000
Urban and transport0000000
Water Industry0100000
Local & central government1000000
Domestic general public0000000
Recreation1000000
Waste treatment and disposal0000000
Other0000000
No sector responsible0000000
Sector under investigation0000000
Total4100000

Objectives

Classification ItemStatusYearReasons
EcologicalGood2039Natural conditions: Ecological recovery time;
Technically infeasible: No known technical solution is available
Biological quality elementsGood2039Natural conditions: Ecological recovery time
FishGood2033Natural conditions: Ecological recovery time
InvertebratesGood2015
Macrophytes and Phytobenthos CombinedGood2039Natural conditions: Ecological recovery time
Physico-chemical quality elementsGood2027Technically infeasible: No known technical solution is available
Acid Neutralising CapacityGood2015
Ammonia (Phys-Chem)Good2015
Dissolved oxygenGood2015
PhosphateGood2027Technically infeasible: No known technical solution is available
TemperatureGood2015
pHGood2015
Hydromorphological Supporting ElementsSupports good2015
Hydrological RegimeSupports good2015
Supporting elements (Surface Water)Good2033Natural conditions: Ecological recovery time
Mitigation Measures AssessmentGood2033Natural conditions: Ecological recovery time
Specific pollutantsHigh2015
ArsenicHigh2015
Chromium (VI)High2015
CopperHigh2015
IronHigh2015
ManganeseHigh2015
PermethrinHigh2015
ZincHigh2015
ChemicalGood2063Natural conditions: Chemical status recovery time;
Technically infeasible: Cause of adverse impact unknown;
Technically infeasible: No known technical solution is available
Priority hazardous substancesGood2063Natural conditions: Chemical status recovery time;
Technically infeasible: No known technical solution is available
Benzo(a)pyreneGood2015
Cadmium and Its CompoundsGood2015
Dioxins and dioxin-like compoundsGood2015
Heptachlor and cis-Heptachlor epoxideGood2015
Hexabromocyclododecane (HBCDD)Good2015
HexachlorobenzeneGood2015
HexachlorobutadieneGood2015
Mercury and Its CompoundsGood2015
Perfluorooctane sulphonate (PFOS)Good2039Technically infeasible: No known technical solution is available
Polybrominated diphenyl ethers (PBDE)Good2063Natural conditions: Chemical status recovery time
Tributyltin CompoundsGood2015
Priority substancesGood2039Technically infeasible: Cause of adverse impact unknown
Cypermethrin (Priority)Good2039Technically infeasible: Cause of adverse impact unknown
FluorantheneGood2015
Lead and Its CompoundsGood2015
Nickel and Its CompoundsGood2015
Other PollutantsDoes not require assessment2015

Protected areas

PA NameIdDirectiveMore information
Lower Thames (Cookham Egham Teddington)SWSGZ4016Safeguard Zone
WeySWSGZ4015Safeguard Zone
Wey (Shalford to River Thames confluence at Weybridge)UKGB106039017630Drinking Water Protected Area

Monitoring sites which have been used to classify this water body

Shows which sites were used for classification for which years within each cycle.

Monitoring SiteCycle 1Cycle 2Cycle 3
RIVER WEY/WEY COMBINED/BYFLEET AT BROOKLANDS/ 103632014, 2012, 2010, 2013, 20092014, 2015, 2016, 20192019
RIVER WEY/WEY COMBINED/MILLMEAD LOOP/ 56392012, 2010, 2013, 2011, 2009
WEY ABOVE TILLINGBOURNE PWER00312012, 2011, 2010, 2013, 2009, 2014
WEY ABOVE THAMES PWER00302010, 2013, 2012, 2011, 2009, 20142015, 2019, 2013, 2016, 20142019, 2022
35816 358162010, 20112016, 2015
WEY AT CARTBRIDGE, SEND PWER00342012, 2011, 2013, 2010, 2009, 20142015, 2013, 2016, 2019, 20142022, 2019
WEY AT PLOUGH BRIDGE, BYFLEET PWER00382012, 2011, 2009, 2010, 20132015, 2016, 20192022, 2019
RIVER WEY/WEY COMBINED/WOODBRIDGE MEADOWS/ 509672015, 2016, 20192019
OCKHAM MILL STREAM AT OCKHAM MILL PWER00142009
RIVER WEY/WEY COMBINED/WALSHAM LOOP/ 56422012, 2010, 2013, 2011, 2009
35818 3581820142015, 2016, 2014
RIVER WEY/WEY COMBINED/D/S BROADMEAD/ 515032015, 2016, 20192019
WEY AT NEWARK LANE, PYRFORD PWER00372012, 2011, 2010, 2013, 2009, 20142015, 2013, 2016, 20142022
WEY BELOW WISLEY STW PWER011720192019
35803 358032014, 2010, 2009, 2013, 20112015, 2014, 2013, 2016
WEY AT BURPHAM COURT BRIDGE PWER003320192019
RIVER WEY/WEY COMBINED/SUTTON PLACE/ 103652012, 2010, 2013, 2011, 2009

Downstream water bodies