Guileshill Brook Water Body

Moderate ecological status

Attributes

  • Water Body IDGB106039017880
  • Water Body TypeRiver
  • Hydromorphological designationnot designated artificial or heavily modified
  • NGRTQ0588656331
  • Catchment area11.665 km2
  • Surveillance Water BodyNo
  • Length3.882 km
  • Catchment area1166.5 ha

Classifications

Classification Item20192022
EcologicalModerate
Biological quality elementsModerate
FishModerate
InvertebratesGood
Macrophytes and Phytobenthos CombinedHigh
Macrophytes Sub ElementHigh
Physico-chemical quality elementsModerate
Ammonia (Phys-Chem)High
Dissolved oxygenModerate
PhosphateGood
TemperatureHigh
pHHigh
Hydromorphological Supporting ElementsSupports good
Hydrological RegimeHigh
MorphologySupports 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 CompoundsGood
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
RNAGmeasures delivered to address reason, awaiting recoveryNot applicableNo sector responsiblePolybrominated diphenyl ethers (PBDE)Details
RNAGNaturalNatural conditions - otherNo sector responsibleFishDetails

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 elementsGood2027 - Low confidenceTechnically infeasible: Cause of adverse impact unknown
FishGood2027 - Low confidenceTechnically infeasible: Cause of adverse impact unknown
InvertebratesGood2015
Macrophytes and Phytobenthos CombinedGood2015
Physico-chemical quality elementsGood2021Disproportionately expensive: Disproportionate burdens
Ammonia (Phys-Chem)Good2015
Dissolved oxygenGood2015
PhosphateGood2021Disproportionately 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 CompoundsGood2015
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
WeySWSGZ4015Safeguard Zone

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
154026 1540262013, 2014, 20112014, 2015, 2013, 2016, 20192019
WEY ABOVE TILLINGBOURNE PWER00312009, 2010
WEY ABOVE THAMES PWER00302009, 2010
GUILESHILL BROOK ABOVE OCKHAM MILL, OCKH PWER02312013, 2011, 2014, 20122016, 2019, 2013, 2014, 20152019
WEY AT CARTBRIDGE, SEND PWER00342009, 2010
WEY AT PLOUGH BRIDGE, BYFLEET PWER00382009, 2010
180405 1804052016
OCKHAM MILL STREAM AT OCKHAM MILL PWER00142009
RIVER WEY/WEY COMBINED/GUILESHILL BROOK/GUILESHILL ROAD/ 328152019, 20162019
WEY AT NEWARK LANE, PYRFORD PWER00372009, 2010

Upstream water bodies