Lark (Hawstead to Abbey Gardens) Water Body

Bad ecological status

Attributes

  • Water Body IDGB105033042940
  • Water Body TypeRiver
  • Hydromorphological designationheavily modified
  • NGRTL8728361901
  • Catchment area29.124 km2
  • Surveillance Water BodyNo
  • Length6.632 km
  • Catchment area2912.435 ha

Classifications

Classification Item2019
EcologicalBad
Biological quality elementsBad
FishBad
InvertebratesGood
Macrophytes and Phytobenthos CombinedPoor
Macrophytes Sub ElementPoor
Physico-chemical quality elementsModerate
Ammonia (Phys-Chem)High
Dissolved oxygenGood
PhosphatePoor
TemperatureHigh
pHHigh
Hydromorphological Supporting ElementsSupports good
Hydrological RegimeDoes not support good
Supporting elements (Surface Water)Moderate
Mitigation Measures AssessmentModerate or less
Specific pollutantsHigh
IronHigh
MecopropHigh
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
ChlorpyrifosGood
Cypermethrin (Priority)Good
FluorantheneGood
Other PollutantsDoes not require assessment

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

Investigations into classification status

Classification ElementCycleYearStatusOutcome
Phosphate22014PoorVery certain there is a problem
Dissolved oxygen22014PoorUncertain there is a problem
Dissolved oxygen22016ModerateCertain there is not a problem

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
RNAGInvasive non-native speciesNorth american signal crayfishNo sector responsibleInvertebratesDetails
RNAGmeasures delivered to address reason, awaiting recoveryNot applicableNo sector responsiblePolybrominated diphenyl ethers (PBDE)Details
RNAGFlowLow Flow (not drought)No sector responsibleDissolved oxygenDetails
RNAGPhysical modificationReservoir / Impoundment - non flow relatedUrban and transportFishDetails
RNAGPoint sourceSewage discharge (continuous)Water IndustryMacrophytes and Phytobenthos CombinedDetails
RNAGFlowGroundwater abstractionWater IndustryDissolved oxygenDetails
RNAGPoint sourceSewage discharge (continuous)Water IndustryDissolved oxygenDetails
RNAGInvasive non-native speciesNorth american signal crayfishNo sector responsibleFishDetails
RNAGPhysical modificationOther (not in list, must add details in comments)Local and Central GovernmentMitigation Measures AssessmentDetails
RNAGPhysical modificationLand drainageAgriculture and rural land managementFishDetails
RNAGPoint sourceSewage discharge (continuous)Water IndustryPhosphateDetails
RNAGDiffuse sourcePoor Livestock ManagementAgriculture and rural land managementInvertebratesDetails
RNAGNaturalNatural conditions - otherNo sector responsibleFishDetails
RNAGInvasive non-native speciesNorth american signal crayfishNo sector responsibleInvertebratesDetails
RNAGPhysical modificationUrbanisation - urban developmentLocal and Central GovernmentInvertebratesDetails
RNAGPhysical modificationFlood protection - structuresLocal and Central GovernmentInvertebratesDetails
RNAGSuspect dataNot applicableNo sector responsibleHydrological RegimeDetails
RNAGFlowGroundwater abstractionWater IndustryInvertebratesDetails
RNAGPhysical modificationOther (not in list, must add details in comments)Agriculture and rural land managementMitigation 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 management1000000
Industry0000000
Mining and quarrying0000000
Navigation0000000
Urban and transport0000000
Water Industry0100000
Local & central government1000000
Domestic general public0000000
Recreation0000000
Waste treatment and disposal0000000
Other0000000
No sector responsible0000100
Sector under investigation0000000
Total2100100

Objectives

Classification ItemStatusYearReasons
EcologicalGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens;
Natural conditions: Ecological recovery time
Biological quality elementsGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens;
Natural conditions: Ecological recovery time
FishGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
InvertebratesGood2021Disproportionately expensive: Disproportionate burdens
Macrophytes and Phytobenthos CombinedNot assessed2027Disproportionately expensive: Disproportionate burdens;
Natural conditions: Ecological recovery time
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 good2027Disproportionately expensive: Disproportionate burdens
Supporting elements (Surface Water)Good2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
Mitigation Measures AssessmentGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
Specific pollutantsHigh2015
IronHigh2015
MecopropHigh2015
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
ChlorpyrifosGood2015
Cypermethrin (Priority)Good2015
FluorantheneGood2015
Other PollutantsDoes not require assessment2015

Protected areas

PA NameIdDirectiveMore information
Ely Ouse and Cut-off channel NVZS390Nitrates Directive
Anglian ChalkG71Nitrates Directive

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
R.LARK SOUTHGATE RD.BR.BURY ST EDMUNDS 37M052012, 2009, 2013, 2010, 2011, 20142015, 2019, 2013, 2016, 20142019
LOWER OUSE/LARK/U/S LARK/U/S ABBEY GARDENS/ 374662014, 2012, 20132015
55941 559412009, 20142016, 2019, 2014, 20152019
55946 559462014, 20132016, 2019, 2013, 2014, 20152019
LOWER OUSE/LARK/U/S LARK/BRIDGE FARM RUSHBROOKE/ 44702019, 20162019

Downstream water bodies