Trym - source to conf R Avon (Brist) Water Body

Moderate ecological status

Viewing latest data (Updated on 01 February 2022). Switch to draft river basin management plan data

Attributes

  • Water Body IDGB109053027530
  • Water Body TypeRiver
  • Hydromorphological designationheavily modified
  • NGRST5631078667
  • Surveillance Water BodyNo
  • Length7.878 km
  • Catchment area21.262 km2
  • Catchment area2126.216 ha

Classifications

Classification Item20132014201520162019
EcologicalModerateModerateModerateModerateModerate
Biological quality elementsModerateBadBadBad
FishBadBadBad
InvertebratesModerateModerateModerateModerate
Physico-chemical quality elementsModerateModerateModerateModerateModerate
Ammonia (Phys-Chem)HighHighHighHighHigh
Dissolved oxygenHighHighHighHighHigh
PhosphateModerateModerateModerateModerateModerate
TemperatureHighHighHighHighHigh
pHHighHighHighHighHigh
Hydromorphological Supporting ElementsSupports goodSupports goodSupports goodSupports goodSupports good
Hydrological RegimeSupports goodSupports goodSupports goodSupports goodSupports good
Supporting elements (Surface Water)ModerateModerateModerateModerateModerate
Mitigation Measures AssessmentModerate or lessModerate or lessModerate or lessModerate or lessModerate or less
Specific pollutantsModerateModerateHighHighHigh
CopperHighHigh
TriclosanModerateModerateHighHighHigh
ZincHighHigh
ChemicalFailFailGoodGoodFail
Priority hazardous substancesFailFailDoes not require assessmentGoodFail
Benzo(a)pyreneGood
Benzo(b)fluorantheneFail
Benzo(g-h-i)peryleneFail
Benzo(k)fluorantheneGood
Cadmium and Its CompoundsGoodGood
Di(2-ethylhexyl)phthalate (Priority hazardous)GoodGood
Dioxins and dioxin-like compoundsGood
Heptachlor and cis-Heptachlor epoxideGood
Hexabromocyclododecane (HBCDD)Good
HexachlorobenzeneGood
HexachlorobutadieneGood
Mercury and Its CompoundsFail
NonylphenolFailFailGoodGood
Perfluorooctane sulphonate (PFOS)Good
Polybrominated diphenyl ethers (PBDE)GoodFail
Tributyltin CompoundsFailFailGood
Priority substancesGoodGoodDoes not require assessmentDoes not require assessmentGood
Cypermethrin (Priority hazardous)Good
FluorantheneGood
Lead and Its CompoundsGoodGood
Nickel and Its CompoundsGoodGood
Other PollutantsDoes not require assessmentDoes not require assessmentDoes not require assessmentDoes not require assessmentDoes not require assessment

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
RNAGUnknown (pending investigation)Unknown (pending investigation)Sector under investigationBenzo(b)fluorantheneDetails
RNAGUnknown (pending investigation)Unknown (pending investigation)Sector under investigationBenzo(g-h-i)peryleneDetails
RNAGDiffuse sourceOther (not in list, must add details in comments)RecreationPhosphateDetails
RNAGDiffuse sourcePoor Livestock ManagementAgriculture and rural land managementPhosphateDetails
RNAGPoint sourceSewage discharge (intermittent)Water IndustryFishDetails
RNAGPoint sourceMisconnectionsWater IndustryFishDetails
RNAGPoint sourceIncidentsWater IndustryFishDetails
RNAGPoint sourceSewage discharge (intermittent)Water IndustryInvertebratesDetails
RNAGPoint sourceUrbanisation - urban developmentUrban and transportPhosphateDetails
RNAGMeasures delivered to address Reason, awaiting classificationNot applicableNo sector responsibleMercury and Its CompoundsDetails
RNAGMeasures delivered to address Reason, awaiting classificationNot applicableNo sector responsiblePolybrominated diphenyl ethers (PBDE)Details
RNAGPhysical modificationFlood protection - structuresOtherFishDetails
RNAGPhysical modificationOther (not in list, must add details in comments)Local and Central GovernmentMitigation Measures AssessmentDetails
RNAGPhysical modificationBarriers - ecological discontinuityOtherFishDetails
RNAGPhysical modificationOther (not in list, must add details in comments)Urban and transportMitigation Measures AssessmentDetails

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 management0000010
Industry0000000
Mining and quarrying0000000
Navigation0000000
Urban and transport1010000
Water Industry0310000
Local & central government1000000
Domestic general public0000000
Recreation0000000
Waste treatment and disposal0000000
Other2000000
No sector responsible0000000
Sector under investigation0000000
Total4320010

Objectives

Classification ItemStatusYearReasons
EcologicalGood2027Disproportionately expensive: Disproportionate burdens;
Disproportionately expensive: Unfavourable balance of costs and benefits;
Natural conditions: Ecological recovery time
Biological quality elementsModerate2027Disproportionately expensive: Unfavourable balance of costs and benefits;
Natural conditions: Ecological recovery time
FishModerate2027Disproportionately expensive: Unfavourable balance of costs and benefits;
Natural conditions: Ecological recovery time
InvertebratesGood2021
Macrophytes and Phytobenthos CombinedNot assessed2015
Physico-chemical quality elementsGood2027Disproportionately expensive: Disproportionate burdens
Ammonia (Phys-Chem)Good2015
Dissolved oxygenGood2015
PhosphateGood2027Disproportionately expensive: Disproportionate burdens
TemperatureGood2015
pHGood2015
Hydromorphological Supporting ElementsSupports good2015
Hydrological RegimeSupports good2015
Supporting elements (Surface Water)Good2027Disproportionately expensive: Disproportionate burdens
Mitigation Measures AssessmentGood2027Disproportionately expensive: Disproportionate burdens
Specific pollutantsHigh2015
TriclosanHigh2015
ChemicalGood2015
Priority hazardous substancesDoes not require assessment2015
Priority substancesDoes not require assessment2015
Other PollutantsDoes not require assessment2015

Protected areas

No data to show

Upstream water bodies

    Downstream water bodies