Calder from Ryburn Confluence to River Colne Water Body

Moderate ecological status

Attributes

  • Water Body IDGB104027062642
  • Water Body TypeRiver
  • Hydromorphological designationheavily modified
  • NGRSE1225621834
  • Surveillance Water BodyYes
  • Catchment area32.081 km2
  • Catchment area3208.1 ha
  • Length18.148 km

Classifications

Classification Item2019
EcologicalModerate
Biological quality elementsModerate
FishModerate
InvertebratesGood
Macrophytes and Phytobenthos CombinedModerate
Macrophytes Sub ElementModerate
Phytobenthos Sub ElementModerate
Physico-chemical quality elementsModerate
Acid Neutralising CapacityHigh
Ammonia (Phys-Chem)Moderate
Biochemical Oxygen Demand (BOD)Moderate
Dissolved oxygenHigh
PhosphateModerate
TemperatureHigh
pHHigh
Hydromorphological Supporting ElementsSupports good
Hydrological RegimeSupports good
Supporting elements (Surface Water)Moderate
Mitigation Measures AssessmentModerate or less
Specific pollutantsModerate
2,4-dichlorophenolHigh
ArsenicHigh
Chromium (VI)High
CopperHigh
DiazinonHigh
PermethrinHigh
PhenolHigh
ZincModerate
ChemicalFail
Priority hazardous substancesFail
Benzo(a)pyreneGood
Dioxins and dioxin-like compoundsGood
Heptachlor and cis-Heptachlor epoxideGood
Hexabromocyclododecane (HBCDD)Good
HexachlorobenzeneGood
HexachlorobutadieneGood
HexachlorocyclohexaneGood
Mercury and Its CompoundsFail
NonylphenolGood
Perfluorooctane sulphonate (PFOS)Fail
Polybrominated diphenyl ethers (PBDE)Fail
Trifluralin (Priority hazardous)Good
Priority substancesGood
AtrazineGood
ChlorfenvinphosGood
Cypermethrin (Priority)Good
FluorantheneGood
PentachlorophenolGood
SimazineGood
TerbutrynGood
TrichlorobenzenesGood
TrichloromethaneGood
Other PollutantsGood
Aldrin, Dieldrin, Endrin & IsodrinGood
Carbon TetrachlorideGood
para - para DDTGood

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
RNAGPhysical modificationOther (not in list, must add details in comments)Urban and transportMitigation 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)NavigationMitigation Measures AssessmentDetails
RNAGPoint sourceSewage discharge (continuous)Water IndustryMacrophytes and Phytobenthos CombinedDetails
RNAGPoint sourceSewage discharge (continuous)Water IndustryAmmonia (Phys-Chem)Details
RNAGPoint sourceSewage discharge (intermittent)Water IndustryAmmonia (Phys-Chem)Details
RNAGDiffuse sourcePoor nutrient managementAgriculture and rural land managementMacrophytes and Phytobenthos CombinedDetails
RNAGUnknown (pending investigation)Unknown (pending investigation)Sector under investigationPerfluorooctane sulphonate (PFOS)Details
RNAGDiffuse sourcePoor nutrient managementAgriculture and rural land managementPhosphateDetails
RNAGPoint sourceSewage discharge (intermittent)Water IndustryPhosphateDetails
RNAGPoint sourceSewage discharge (continuous)Water IndustryPhosphateDetails
RNAGUnknown (pending investigation)Unknown (pending investigation)Sector under investigationBiochemical Oxygen Demand (BOD)Details
RNAGPhysical modificationUrbanisation - urban developmentIndustryFishDetails
RNAGmeasures delivered to address reason, awaiting recoveryNot applicableNo sector responsibleMercury and Its CompoundsDetails
RNAGPhysical modificationBarriers - ecological discontinuityIndustryFishDetails
RNAGmeasures delivered to address reason, awaiting recoveryNot applicableNo sector responsiblePolybrominated diphenyl ethers (PBDE)Details
RNAGSuspect dataNot applicableNo sector responsibleZincDetails

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
Industry2000000
Mining and quarrying0000000
Navigation1000000
Urban and transport1000000
Water Industry0500000
Local & central government1000000
Domestic general public0000000
Recreation0000000
Waste treatment and disposal0000000
Other0000000
No sector responsible0000000
Sector under investigation0000000
Total5500000

Objectives

Classification ItemStatusYearReasons
EcologicalModerate2021Disproportionately expensive: Disproportionate burdens;
Disproportionately expensive: Unfavourable balance of costs and benefits;
Technically infeasible: No known technical solution is available
Biological quality elementsModerate2021Disproportionately expensive: Disproportionate burdens;
Technically infeasible: No known technical solution is available
FishGood2015
InvertebratesGood2021Disproportionately expensive: Disproportionate burdens
Macrophytes and Phytobenthos CombinedModerate2021Technically infeasible: No known technical solution is available
Physico-chemical quality elementsModerate2015Disproportionately expensive: Unfavourable balance of costs and benefits;
Technically infeasible: No known technical solution is available
Acid Neutralising CapacityGood2015
Ammonia (Phys-Chem)Moderate2021Disproportionately expensive: Unfavourable balance of costs and benefits
Dissolved oxygenGood2015
PhosphateModerate2021Technically infeasible: No known technical solution is available
TemperatureGood2015
pHGood2015
Hydromorphological Supporting ElementsSupports good2015
Hydrological RegimeSupports good2015
Supporting elements (Surface Water)Good2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
Mitigation Measures AssessmentGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
Specific pollutantsModerate2015Disproportionately expensive: Unfavourable balance of costs and benefits
2,4-dichlorophenolHigh2015
ArsenicHigh2015
Chromium (VI)High2015
CopperHigh2015
DiazinonHigh2015
PermethrinHigh2015
PhenolHigh2015
ZincModerate2021Disproportionately expensive: Unfavourable balance of costs and benefits
ChemicalGood2063Natural conditions: Chemical status recovery time;
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
Dioxins and dioxin-like compoundsGood2015
Heptachlor and cis-Heptachlor epoxideGood2015
Hexabromocyclododecane (HBCDD)Good2015
HexachlorobenzeneGood2015
HexachlorobutadieneGood2015
HexachlorocyclohexaneGood2015
Mercury and Its CompoundsGood2040Natural conditions: Chemical status recovery time
NonylphenolGood2015
Perfluorooctane sulphonate (PFOS)Good2039Technically infeasible: No known technical solution is available
Polybrominated diphenyl ethers (PBDE)Good2063Natural conditions: Chemical status recovery time
Trifluralin (Priority hazardous)Good2015
Priority substancesGood2015
AtrazineGood2015
ChlorfenvinphosGood2015
Cypermethrin (Priority)Good2015
FluorantheneGood2015
PentachlorophenolGood2015
SimazineGood2015
TerbutrynGood2015
TrichlorobenzenesGood2015
TrichloromethaneGood2015
Other PollutantsGood2015
Aldrin, Dieldrin, Endrin & IsodrinGood2015
Carbon TetrachlorideGood2015
para - para DDTGood2015

Protected areas

No data to show

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
1409 14092011, 2012, 2010, 20132015, 2013, 2016
CALDER AT COPLEY CHURCH 4950060220092015, 2016
RIVER CALDER CATCHMENT/RIVER CALDER/ELLAND POWER STATION D/S/ 83032014, 2012, 2010, 2013, 20112016, 2019, 2014, 2015, 20132019
CALDER AT A62 COOPER BRIDGE 495006012012, 2014, 20132014, 2019, 2013, 2015, 20162019
1174 11742010, 2013, 2014, 20122014, 2013, 2015, 2016, 20192019
1167 11672009
CALDER AT NORTH DENE B6112 ROAD BRIDGE 495006212012, 2014, 2010, 2009, 2013, 20112014, 2013, 2015, 2019, 20162019
157457 1574572013, 2014, 2012
RIVER CALDER CATCHMENT/RIVER CALDER/CORNMILL WEIR/ 83592014, 2012, 2013, 20112016, 2019, 2014, 2015, 20132019
65 652009
64 642010