Grand Union Canal, Maple Lodge to Uxbridge (Rivers Colne and Chess plus canal) Water Body
Moderate ecological status
Get Grand Union Canal, Maple Lodge to Uxbridge (Rivers Colne and Chess plus canal) data
Attributes
- Water Body IDGB70610252
- Water Body TypeCanal
- Hydromorphological designationartificial
- NGRTQ0519087645
- Length11.197 km
- Surveillance Water BodyNo
Classifications
Classification Item | 2019 |
---|---|
Ecological | Moderate |
Physico-chemical quality elements | Moderate |
Acid Neutralising Capacity | High |
Ammonia (Phys-Chem) | High |
Dissolved oxygen | High |
Phosphate | Poor |
Temperature | High |
pH | High |
Supporting elements (Surface Water) | Moderate |
Mitigation Measures Assessment | Moderate or less |
Specific pollutants | High |
Arsenic | High |
Chromium (VI) | High |
Copper | High |
Iron | High |
Zinc | High |
Chemical | Fail |
Priority hazardous substances | Fail |
Benzo(a)pyrene | Good |
Cadmium and Its Compounds | 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 |
Atrazine | Good |
Fluoranthene | Good |
Lead and Its Compounds | Good |
Nickel and Its Compounds | Good |
Simazine | Good |
Other Pollutants | Does not require assessment |
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 Type | SWMI | Activity | Category | Classification Element | More information |
---|---|---|---|---|---|
RNAG | Unknown (pending investigation) | Unknown (pending investigation) | Sector under investigation | Polybrominated diphenyl ethers (PBDE) | Details |
RNAG | Physical modification | Other (not in list, must add details in comments) | Recreation | Mitigation Measures Assessment | Details |
RNAG | Point source | Private Sewage Treatment | Urban and transport | Phosphate | Details |
RNAG | Point source | Sewage discharge (intermittent) | Water Industry | Phosphate | Details |
RNAG | Point source | Sewage discharge (continuous) | Water Industry | Phosphate | Details |
RNAG | Diffuse source | Urbanisation - urban development | Urban and transport | Phosphate | Details |
RNAG | Point source | Misconnections | Domestic General Public | 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 | 0 | 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 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
Water Industry | 0 | 2 | 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 | 1 | 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 | 1 | 2 | 1 | 0 | 0 | 0 | 0 |
Objectives
Classification Item | Status | Year | Reasons |
---|---|---|---|
Ecological | Moderate | 2015 | Disproportionately expensive: Disproportionate burdens; Disproportionately expensive: Unfavourable balance of costs and benefits |
Biological quality elements | Not assessed | 2015 | |
Physico-chemical quality elements | Moderate | 2015 | Disproportionately expensive: Unfavourable balance of costs and benefits |
Acid Neutralising Capacity | Good | 2015 | |
Ammonia (Phys-Chem) | Good | 2015 | |
Dissolved oxygen | Good | 2015 | |
Phosphate | Poor | 2015 | Disproportionately expensive: Unfavourable balance of costs and benefits |
Temperature | Good | 2015 | |
pH | Good | 2015 | |
Hydromorphological Supporting Elements | Not assessed | 2015 | |
Supporting elements (Surface Water) | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
Mitigation Measures Assessment | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
Specific pollutants | High | 2015 | |
Arsenic | High | 2015 | |
Chromium (VI) | High | 2015 | |
Copper | High | 2015 | |
Iron | High | 2015 | |
Zinc | High | 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 | |
Cadmium and Its Compounds | 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 | |
Atrazine | Good | 2015 | |
Fluoranthene | Good | 2015 | |
Lead and Its Compounds | Good | 2015 | |
Nickel and Its Compounds | Good | 2015 | |
Simazine | Good | 2015 | |
Other Pollutants | Does not require assessment | 2015 |
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.