Datchet Common Brook Water Body
Moderate ecological status
Get Datchet Common Brook data
Attributes
- Water Body IDGB106039023520
- Water Body TypeRiver
- Hydromorphological designationheavily modified
- NGRSU9907979268
- Catchment area1711.779 ha
- Length11.312 km
- Catchment area17.118 km2
- Surveillance Water BodyNo
Classifications
Classification Item | 2019 | 2022 |
---|---|---|
Ecological | Moderate | Moderate |
Biological quality elements | Poor | Moderate |
Fish | Poor | Good |
Invertebrates | Good | Good |
Macrophytes and Phytobenthos Combined | Moderate | Moderate |
Phytobenthos Sub Element | Moderate | Moderate |
Physico-chemical quality elements | Moderate | Moderate |
Ammonia (Phys-Chem) | High | High |
Dissolved oxygen | Moderate | Moderate |
Phosphate | Moderate | Poor |
Temperature | High | High |
pH | High | High |
Hydromorphological Supporting Elements | Supports good | Supports good |
Hydrological Regime | Supports good | Supports good |
Supporting elements (Surface Water) | Moderate | Moderate |
Mitigation Measures Assessment | Moderate or less | Moderate or less |
Chemical | Fail | Does not require assessment |
Priority hazardous substances | Fail | Does not require assessment |
Benzo(a)pyrene | Good | |
Dioxins and dioxin-like compounds | Good | |
Heptachlor and cis-Heptachlor epoxide | Good | |
Hexabromocyclododecane (HBCDD) | Good | |
Hexachlorobenzene | Good | |
Hexachlorobutadiene | Good | |
Mercury and Its Compounds | Good | |
Perfluorooctane sulphonate (PFOS) | Good | |
Polybrominated diphenyl ethers (PBDE) | Fail | |
Priority substances | Good | Does not require assessment |
Cypermethrin (Priority) | Good | |
Fluoranthene | Good | |
Other Pollutants | Does not require assessment | Does not require assessment |
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 Type | SWMI | Activity | Category | Classification Element | More information |
---|---|---|---|---|---|
RNAG | Unknown (pending investigation) | Unknown (pending investigation) | Sector under investigation | Dissolved oxygen | Details |
RNAG | Diffuse source | Transport Drainage | Urban and transport | Macrophytes and Phytobenthos Combined | Details |
RNAG | Diffuse source | Urbanisation - urban development | Urban and transport | Fish | Details |
RNAG | Point source | Sewage discharge (intermittent) | Water Industry | Macrophytes and Phytobenthos Combined | Details |
RNAG | Physical modification | Urbanisation - urban development | Urban and transport | Fish | Details |
RNAG | Physical modification | Other (not in list, must add details in comments) | Urban and transport | Mitigation Measures Assessment | Details |
RNAG | Physical modification | Urbanisation - transport | Urban and transport | Fish | Details |
RNAG | Point source | Sewage discharge (intermittent) | Water Industry | Phosphate | Details |
RNAG | Diffuse source | Transport Drainage | Urban and transport | Phosphate | Details |
RNAG | Point source | Incidents | Water Industry | Dissolved oxygen | Details |
RNAG | Physical modification | Other (not in list, must add details in comments) | Agriculture and rural land management | Mitigation Measures Assessment | Details |
RNAG | measures delivered to address reason, awaiting recovery | Not applicable | No sector responsible | Polybrominated diphenyl ethers (PBDE) | Details |
RNAG | Diffuse source | Transport Drainage | Urban and transport | Dissolved oxygen | Details |
RNAG | Diffuse source | Urbanisation - urban development | Urban and transport | Phosphate | Details |
RNAG | Natural | Drought | No sector responsible | Dissolved oxygen | Details |
RNAG | Point source | Sewage discharge (intermittent) | Water Industry | Phosphate | 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 issue | Physical modifications | Pollution from waste water | Pollution from towns, cities and transport | Changes to the natural flow and level of water | Invasive non-native species | Pollution from rural areas | Pollution from abandoned mines |
---|---|---|---|---|---|---|---|
Agriculture and rural land management | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
Industry | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Mining and quarrying | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Navigation | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Urban and transport | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
Water Industry | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
Local & central government | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Domestic general public | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Recreation | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Waste treatment and disposal | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Other | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
No sector responsible | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Sector under investigation | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Total | 2 | 1 | 0 | 0 | 0 | 0 | 0 |
Objectives
Classification Item | Status | Year | Reasons |
---|---|---|---|
Ecological | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens; Technically infeasible: Practical technical constraints prevent implementation of the measure by an earlier deadline |
Biological quality elements | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
Fish | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
Invertebrates | Good | 2015 | |
Macrophytes and Phytobenthos Combined | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
Physico-chemical quality elements | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
Ammonia (Phys-Chem) | Good | 2015 | |
Dissolved oxygen | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
Phosphate | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
Temperature | Good | 2015 | |
pH | Good | 2015 | |
Hydromorphological Supporting Elements | Supports good | 2015 | |
Hydrological Regime | Supports good | 2015 | |
Supporting elements (Surface Water) | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens; Technically infeasible: Practical technical constraints prevent implementation of the measure by an earlier deadline |
Mitigation Measures Assessment | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens; Technically infeasible: Practical technical constraints prevent implementation of the measure by an earlier deadline |
Specific pollutants | Not assessed | 2015 | |
Chemical | Good | 2063 | Natural conditions: Chemical status recovery time |
Priority hazardous substances | Good | 2063 | Natural conditions: Chemical status recovery time |
Benzo(a)pyrene | Good | 2015 | |
Dioxins and dioxin-like compounds | Good | 2015 | |
Heptachlor and cis-Heptachlor epoxide | Good | 2015 | |
Hexabromocyclododecane (HBCDD) | Good | 2015 | |
Hexachlorobenzene | Good | 2015 | |
Hexachlorobutadiene | Good | 2015 | |
Mercury and Its Compounds | Good | 2015 | |
Perfluorooctane sulphonate (PFOS) | Good | 2015 | |
Polybrominated diphenyl ethers (PBDE) | Good | 2063 | Natural conditions: Chemical status recovery time |
Priority substances | Good | 2015 | |
Cypermethrin (Priority) | Good | 2015 | |
Fluoranthene | Good | 2015 | |
Other Pollutants | Does not require assessment | 2015 |
Protected areas
PA Name | Id | Directive | More information |
---|---|---|---|
Lower Thames (Cookham Egham Teddington) | SWSGZ4016 | Safeguard Zone | |
South West London Waterbodies | UK9012171 | Special Protection Area | Natural England |
South West London Waterbodies | UK11065 | Ramsar Site | Natural 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.