Skell from Source to River Laver Water Body

Moderate ecological status

Attributes

  • Water Body IDGB104027064130
  • Water Body TypeRiver
  • Hydromorphological designationheavily modified
  • NGRSE2453569330
  • Surveillance Water BodyNo
  • Length22.151 km
  • Catchment area37.633 km2
  • Catchment area3763.28 ha

Classifications

Classification Item20192022
EcologicalModerateModerate
Biological quality elementsGoodGood
FishGoodGood
InvertebratesGoodGood
Macrophytes and Phytobenthos Combined
Macrophytes Sub ElementGoodGood
Physico-chemical quality elementsModerateGood
Ammonia (Phys-Chem)HighHigh
Biochemical Oxygen Demand (BOD)High
Dissolved oxygenModerateGood
PhosphateHighHigh
TemperatureHighHigh
pHHighHigh
Hydromorphological Supporting ElementsSupports goodSupports good
Hydrological RegimeSupports goodSupports good
Supporting elements (Surface Water)ModerateModerate
Mitigation Measures AssessmentModerate or lessModerate or less
ChemicalFailDoes not require assessment
Priority hazardous substancesFailDoes not require assessment
Benzo(a)pyreneGood
Dioxins and dioxin-like compoundsGood
Heptachlor and cis-Heptachlor epoxideGood
Hexabromocyclododecane (HBCDD)Good
HexachlorobenzeneGood
HexachlorobutadieneGood
Mercury and Its CompoundsFail
Perfluorooctane sulphonate (PFOS)Good
Polybrominated diphenyl ethers (PBDE)Fail
Priority substancesGoodDoes not require assessment
Cypermethrin (Priority)Good
FluorantheneGood
Other PollutantsDoes not require assessmentDoes not require assessment

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

Investigations into classification status

Classification ElementCycleYearStatusOutcome
Fish22013ModerateVery certain there is a problem
Fish22013ModerateVery certain there is a problem
Fish22013ModerateVery certain there is 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
RNAGUnknown (pending investigation)Unknown (pending investigation)Sector under investigationDissolved oxygenDetails
RNAGPhysical modificationLand drainage - operational managementAgriculture and rural land managementFishDetails
RNAGPhysical modificationConservation and heritageOtherFishDetails
RNAGmeasures delivered to address reason, awaiting recoveryNot applicableNo sector responsiblePolybrominated diphenyl ethers (PBDE)Details
RNAGmeasures delivered to address reason, awaiting recoveryNot applicableNo sector responsibleMercury and Its CompoundsDetails

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
Navigation0000000
Urban and transport0000000
Water Industry0000000
Local & central government0000000
Domestic general public0000000
Recreation0000000
Waste treatment and disposal0000000
Other0000000
No sector responsible0000000
Sector under investigation0000000
Total0000000

Objectives

Classification ItemStatusYearReasons
EcologicalGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens;
Technically infeasible: Cause of adverse impact unknown
Biological quality elementsGood2015
FishGood2015
InvertebratesGood2015
Macrophytes and Phytobenthos CombinedNot assessed2015
Physico-chemical quality elementsGood2027 - Low confidenceTechnically infeasible: Cause of adverse impact unknown
Ammonia (Phys-Chem)Good2015
Dissolved oxygenGood2027 - Low confidenceTechnically infeasible: Cause of adverse impact unknown
PhosphateGood2015
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 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 CompoundsGood2040Natural conditions: Chemical status recovery time
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
North Pennine MoorsUK9006272Special Protection AreaNatural England
North Pennine MoorsUK0030033Special Area of ConservationNatural England
Yorkshire Mag LimestoneG101Nitrates 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
RIVER URE TRIBUTARIES/R. SKELL/RIVER SKELL (WHITCLIFFE LANE)/ 70672012, 2010, 2009, 2013, 20142019, 2015, 2013, 2016, 20142022, 2019
RIVER URE TRIBUTARIES/R. SKELL/RIVER SKELL, LAYBY (GRANTLY)/ 266782012, 2010, 2009, 2013, 2011, 20142019, 2015, 2013, 2016, 20142022, 2019
162701 1627012016, 2014, 2015
RIVER URE TRIBUTARIES/RIVER LAVER/HOLBURN BECK/D/S WATERWORKS COTTAGE FOOTBRIDGE/ 365782012, 2013, 2011
SKELL AT HELL WATH LANE 4910518920142015, 2019, 2016, 20142019, 2022
SKELL AT WOOD BRIDGE - RIPON 491005222009, 2010, 2011

Upstream water bodies