The Moat at Egham Water Body

Poor ecological status

Attributes

  • Water Body IDGB106039017060
  • Water Body TypeRiver
  • Hydromorphological designationheavily modified
  • NGRTQ0180368367
  • Catchment area14.478 km2
  • Surveillance Water BodyNo
  • Length4.937 km
  • Catchment area1447.83 ha

Classifications

Classification Item2019
EcologicalPoor
Biological quality elementsPoor
InvertebratesPoor
Macrophytes and Phytobenthos CombinedModerate
Macrophytes Sub ElementModerate
Physico-chemical quality elementsModerate
Ammonia (Phys-Chem)Good
Dissolved oxygenBad
PhosphateModerate
TemperatureHigh
pHHigh
Hydromorphological Supporting ElementsSupports good
Hydrological RegimeDoes not support good
Supporting elements (Surface Water)Moderate
Mitigation Measures AssessmentModerate or less
ChemicalFail
Priority hazardous substancesFail
Benzo(a)pyreneGood
Dioxins and dioxin-like compoundsGood
Heptachlor and cis-Heptachlor epoxideGood
Hexabromocyclododecane (HBCDD)Good
HexachlorobenzeneGood
HexachlorobutadieneGood
Mercury and Its CompoundsGood
Perfluorooctane sulphonate (PFOS)Good
Polybrominated diphenyl ethers (PBDE)Fail
Priority substancesGood
Cypermethrin (Priority)Good
FluorantheneGood
Other PollutantsDoes 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 (intermittent)Water IndustryMacrophytes and Phytobenthos CombinedDetails
RNAGNaturalDroughtNo sector responsibleMacrophytes and Phytobenthos CombinedDetails
RNAGDiffuse sourceTransport DrainageUrban and transportMacrophytes and Phytobenthos CombinedDetails
RNAGPhysical modificationLand drainageAgriculture and rural land managementMacrophytes and Phytobenthos CombinedDetails
RNAGPhysical modificationOther (not in list, must add details in comments)RecreationMitigation Measures AssessmentDetails
RNAGmeasures delivered to address reason, awaiting recoveryNot applicableNo sector responsiblePolybrominated diphenyl ethers (PBDE)Details
RNAGPoint sourceSewage discharge (continuous)Urban and transportPhosphateDetails
RNAGDiffuse sourceTransport DrainageUrban and transportPhosphateDetails
RNAGPoint sourceSewage discharge (intermittent)Water IndustryPhosphateDetails
RNAGFlowSurface water abstractionOtherHydrological RegimeDetails
RNAGPoint sourceSewage discharge (intermittent)Water IndustryInvertebratesDetails
RNAGNaturalDroughtNo sector responsibleDissolved oxygenDetails
RNAGPhysical modificationBarriers - ecological discontinuityOtherInvertebratesDetails
RNAGNaturalDroughtNo sector responsibleInvertebratesDetails
RNAGPhysical modificationLand drainageAgriculture and rural land managementInvertebratesDetails

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 management2000000
Industry0000000
Mining and quarrying0000000
Navigation0000000
Urban and transport0120000
Water Industry0300000
Local & central government0000000
Domestic general public0000000
Recreation1000000
Waste treatment and disposal0000000
Other1000000
No sector responsible0000000
Sector under investigation0000000
Total4420000

Objectives

Classification ItemStatusYearReasons
EcologicalGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens;
Technically infeasible: Practical technical constraints prevent implementation of the measure by an earlier deadline
Biological quality elementsGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
InvertebratesGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
Macrophytes and Phytobenthos CombinedGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
Physico-chemical quality elementsGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
Ammonia (Phys-Chem)Good2015
Dissolved oxygenGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
PhosphateGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
TemperatureGood2015
pHGood2015
Hydromorphological Supporting ElementsSupports good2015
Hydrological RegimeDoes not support good2015Disproportionately expensive: Unfavourable balance of costs and benefits
Supporting elements (Surface Water)Good2027 - Low confidenceDisproportionately expensive: Disproportionate burdens;
Technically infeasible: Practical technical constraints prevent implementation of the measure by an earlier deadline
Mitigation Measures AssessmentGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens;
Technically infeasible: Practical technical constraints prevent implementation of the measure by an earlier deadline
Specific pollutantsNot assessed2015
ChemicalGood2063Natural conditions: Chemical status recovery time
Priority hazardous substancesGood2063Natural conditions: Chemical status recovery time
Benzo(a)pyreneGood2015
Dioxins and dioxin-like compoundsGood2015
Heptachlor and cis-Heptachlor epoxideGood2015
Hexabromocyclododecane (HBCDD)Good2015
HexachlorobenzeneGood2015
HexachlorobutadieneGood2015
Mercury and Its CompoundsGood2015
Perfluorooctane sulphonate (PFOS)Good2015
Polybrominated diphenyl ethers (PBDE)Good2063Natural conditions: Chemical status recovery time
Priority substancesGood2015
Cypermethrin (Priority)Good2015
FluorantheneGood2015
Other PollutantsDoes not require assessment2015

Protected areas

PA NameIdDirectiveMore information
Lower Thames (Cookham Egham Teddington)SWSGZ4016Safeguard Zone
South West London WaterbodiesUK9012171Special Protection AreaNatural England
South West London WaterbodiesUK11065Ramsar SiteNatural England

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
THE MOAT AT MILL LANE PBNR00562014, 2012, 20132015, 2014, 2013, 2016, 20192019
154040 1540402014, 2013, 20112015, 2013, 2014, 2016
BOURNE ( NORTH ) AT HAMPERSTONE BRIDGE PBNR00012010, 2009

Upstream water bodies