Deanoak Brook Water Body

Poor ecological status

Attributes

  • Water Body IDGB106039017530
  • Water Body TypeRiver
  • Hydromorphological designationnot designated artificial or heavily modified
  • NGRTQ2227744350
  • Catchment area3266.01 ha
  • Length12.687 km
  • Catchment area32.66 km2
  • Surveillance Water BodyNo

Classifications

Classification Item20192022
EcologicalPoorPoor
Biological quality elementsPoorPoor
FishGoodModerate
InvertebratesModerateModerate
Macrophytes and Phytobenthos CombinedPoorPoor
Phytobenthos Sub ElementPoorPoor
Physico-chemical quality elementsModerateModerate
Ammonia (Phys-Chem)HighHigh
Dissolved oxygenModerateModerate
PhosphateModerateModerate
TemperatureHighHigh
pHHighHigh
Hydromorphological Supporting ElementsSupports goodSupports good
Hydrological RegimeHighHigh
MorphologySupports goodSupports good
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

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 sourcePrivate Sewage TreatmentDomestic General PublicPhosphateDetails
RNAGDiffuse sourcePoor Livestock ManagementAgriculture and rural land managementMacrophytes and Phytobenthos CombinedDetails
RNAGDiffuse sourcePoor Livestock ManagementAgriculture and rural land managementPhosphateDetails
RNAGmeasures delivered to address reason, awaiting recoveryNot applicableNo sector responsiblePolybrominated diphenyl ethers (PBDE)Details
RNAGPoint sourceFarm/site infrastructureAgriculture and rural land managementInvertebratesDetails
RNAGPhysical modificationLand drainage - structuresAgriculture and rural land managementDissolved oxygenDetails
RNAGPoint sourcePrivate Sewage TreatmentDomestic General PublicInvertebratesDetails
RNAGNaturalDroughtNo sector responsibleDissolved oxygenDetails
RNAGDiffuse sourcePoor Livestock ManagementAgriculture and rural land managementInvertebratesDetails
RNAGPoint sourcePrivate Sewage TreatmentDomestic General PublicDissolved oxygenDetails
RNAGPoint sourcePrivate Sewage TreatmentDomestic General PublicInvertebratesDetails
RNAGDiffuse sourcePoor Livestock ManagementAgriculture and rural land managementDissolved oxygenDetails
RNAGmeasures delivered to address reason, awaiting recoveryNot applicableNo sector responsibleMercury and Its CompoundsDetails
RNAGPoint sourcePrivate Sewage TreatmentDomestic General PublicMacrophytes and Phytobenthos CombinedDetails

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 management1000040
Industry0000000
Mining and quarrying0000000
Navigation0000000
Urban and transport0000000
Water Industry0000000
Local & central government0000000
Domestic general public0050000
Recreation0000000
Waste treatment and disposal0000000
Other0000000
No sector responsible0000000
Sector under investigation0000000
Total1050040

Objectives

Classification ItemStatusYearReasons
EcologicalGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
Biological quality elementsGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
FishGood2021Disproportionately 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 RegimeSupports good2015
Supporting elements (Surface Water)Not assessed2015
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

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
DEANOAK BROOK ABOVE DEANOAK ROAD BRIDGE PMLR02682013, 2012, 20142013, 2016, 2019, 2014, 20152019
MOLE JUST ABOVE DORKING STW PMLR00382009
MOLE AT WICK FARM, HORLEY PMLR00352010, 2011, 2009
MOLE AT RIVER LANE, LEATHERHEAD PMLR00302011, 2009
34505 345052014, 2013, 20112016, 2014, 2015
RIVER MOLE/MOLE TRIBUTARIES/DEANOAK BROOK/CIDERHILL ROAD/ 319932011, 2014, 2012, 2010, 2013, 20092016, 2019, 2014, 2015, 20132019, 2022
EARLSWOOD BROOK ABOVE MOLE PMLR00102010, 2011, 2009
MOLE ABOVE HORLEY S/W PMLR00182010, 2011, 2009
MOLE ABOVE GATWICK STREAM PMLR00172009
RIVER MOLE/MOLE TRIBUTARIES/DEANOAK BROOK/DEANOAK BRIDGE/ 394882014, 2012, 20132016, 2014, 2015, 2013
MOLE AT KINNERSLEY MANOR PMLR00272010, 2011, 2009
MOLE AT FLANCHFORD BRIDGE, LEIGH PMLR00262009
RIVER MOLE/MOLE TRIBUTARIES/DEANOAK BROOK/STUMBLEHOLE FARM D/S FOOT BRIDGE/ 668232022
MOLE AT STOKE D'ABERNON BRIDGE PMLR00332010, 2011, 2009
GATWICK STREAM ABOVE MOLE PMLR00112009

Upstream water bodies

    Downstream water bodies