Hale/Mill Bourne (Bagshot to Addlestone Bourne confluence near Chobham) Water Body

Moderate ecological status

Attributes

  • Water Body IDGB106039017930
  • Water Body TypeRiver
  • Hydromorphological designationnot designated artificial or heavily modified
  • NGRSU9393562147
  • Catchment area45.282 km2
  • Surveillance Water BodyNo
  • Length15.395 km
  • Catchment area4528.19 ha

Classifications

Classification Item2019
EcologicalModerate
Biological quality elementsModerate
FishModerate
InvertebratesGood
Macrophytes and Phytobenthos CombinedGood
Macrophytes Sub ElementGood
Physico-chemical quality elementsModerate
Acid Neutralising CapacityHigh
Ammonia (Phys-Chem)Poor
Dissolved oxygenGood
PhosphatePoor
TemperatureHigh
pHHigh
Hydromorphological Supporting ElementsSupports good
Hydrological RegimeSupports good
MorphologySupports good
Specific pollutantsHigh
IronHigh
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
Cypermethrin (Priority)Good
FluorantheneGood
Other PollutantsDoes 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
RNAGPhysical modificationLand drainageAgriculture and rural land managementFishDetails
RNAGPhysical modificationBarriers - ecological discontinuityAgriculture and rural land managementFishDetails
RNAGmeasures delivered to address reason, awaiting recoveryNot applicableNo sector responsiblePolybrominated diphenyl ethers (PBDE)Details
RNAGDiffuse sourceTransport DrainageUrban and transportPhosphateDetails
RNAGPoint sourceSewage discharge (continuous)Water IndustryPhosphateDetails
RNAGPoint sourceSewage discharge (continuous)Water IndustryAmmonia (Phys-Chem)Details

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 transport0010000
Water Industry0100000
Local & central government0000000
Domestic general public0000000
Recreation0000000
Waste treatment and disposal0000000
Other0000000
No sector responsible0000000
Sector under investigation0000000
Total0110000

Objectives

Classification ItemStatusYearReasons
EcologicalModerate2015Disproportionately expensive: Disproportionate burdens;
Natural conditions: Ecological recovery time;
Technically infeasible: No known technical solution is available
Biological quality elementsGood2033Natural conditions: Ecological recovery time
FishGood2033Natural conditions: Ecological recovery time
InvertebratesGood2015
Macrophytes and Phytobenthos CombinedGood2015
Physico-chemical quality elementsModerate2015Disproportionately expensive: Disproportionate burdens;
Technically infeasible: No known technical solution is available
Acid Neutralising CapacityGood2015
Ammonia (Phys-Chem)Good2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
Dissolved oxygenGood2015
PhosphatePoor2015Technically infeasible: No known technical solution is available
TemperatureGood2015
pHGood2015
Hydromorphological Supporting ElementsSupports good2015
Hydrological RegimeSupports good2015
Supporting elements (Surface Water)Not assessed2015
Specific pollutantsHigh2015
IronHigh2015
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
Lower Thames (Cookham Egham Teddington)SWSGZ4016Safeguard Zone
Thursley, Ash, Pirbright & ChobhamUK0012793Special Area of ConservationNatural England

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
HALE BOURNE AT HALEBOURNE LANE, CHOBHAM PBNR00062009, 2014, 2012, 2010, 2013, 20112014, 2015, 2016, 2013
36103 361032014, 20092016, 2014, 2015
154802 1548022013, 20142016, 2015, 2014
RIVER WEY/ADDLESTONE BOURNE/HALE BOURNE/D/S CHOBHAM/ 509632019, 2015, 20162019
RIVER WEY/ADDLESTONE BOURNE/HALE BOURNE/D/S LIGHTWATER STW/ 1037920092019, 2015, 20162019
RIVER WEY/ADDLESTONE BOURNE/HALE BOURNE/EMMETTS/ 212222009

Upstream water bodies