Trym - source to conf R Avon (Brist) Water Body
Moderate ecological status
Get Trym - source to conf R Avon (Brist) data
Attributes
- Water Body IDGB109053027530
- Water Body TypeRiver
- Hydromorphological designationheavily modified
- NGRST5631078667
- Surveillance Water BodyNo
- Length7.878 km
- Catchment area21.262 km2
- Catchment area2126.216 ha
Classifications
| Classification Item | 2013 | 2014 | 2015 | 2016 | 2019 |
|---|---|---|---|---|---|
| Ecological | Moderate | Moderate | Moderate | Moderate | Moderate |
| Biological quality elements | Moderate | Bad | Bad | Bad | |
| Fish | Bad | Bad | Bad | ||
| Invertebrates | Moderate | Moderate | Moderate | Moderate | |
| Physico-chemical quality elements | Moderate | Moderate | Moderate | Moderate | Moderate |
| Ammonia (Phys-Chem) | High | High | High | High | High |
| Dissolved oxygen | High | High | High | High | High |
| Phosphate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Temperature | High | High | High | High | High |
| pH | High | High | High | High | High |
| Hydromorphological Supporting Elements | Supports good | Supports good | Supports good | Supports good | Supports good |
| Hydrological Regime | Supports good | Supports good | Supports good | Supports good | Supports good |
| Supporting elements (Surface Water) | Moderate | Moderate | Moderate | Moderate | Moderate |
| Mitigation Measures Assessment | Moderate or less | Moderate or less | Moderate or less | Moderate or less | Moderate or less |
| Specific pollutants | Moderate | Moderate | High | High | High |
| Copper | High | High | |||
| Triclosan | Moderate | Moderate | High | High | High |
| Zinc | High | High | |||
| Chemical | Fail | Fail | Good | Good | Fail |
| Priority hazardous substances | Fail | Fail | Does not require assessment | Good | Fail |
| Benzo(a)pyrene | Good | ||||
| Benzo(b)fluoranthene | Fail | ||||
| Benzo(g-h-i)perylene | Fail | ||||
| Benzo(k)fluoranthene | Good | ||||
| Cadmium and Its Compounds | Good | Good | |||
| Di(2-ethylhexyl)phthalate (Priority hazardous) | Good | Good | |||
| Dioxins and dioxin-like compounds | Good | ||||
| Heptachlor and cis-Heptachlor epoxide | Good | ||||
| Hexabromocyclododecane (HBCDD) | Good | ||||
| Hexachlorobenzene | Good | ||||
| Hexachlorobutadiene | Good | ||||
| Mercury and Its Compounds | Fail | ||||
| Nonylphenol | Fail | Fail | Good | Good | |
| Perfluorooctane sulphonate (PFOS) | Good | ||||
| Polybrominated diphenyl ethers (PBDE) | Good | Fail | |||
| Tributyltin Compounds | Fail | Fail | Good | ||
| Priority substances | Good | Good | Does not require assessment | Does not require assessment | Good |
| Cypermethrin (Priority hazardous) | Good | ||||
| Fluoranthene | Good | ||||
| Lead and Its Compounds | Good | Good | |||
| Nickel and Its Compounds | Good | Good | |||
| Other Pollutants | Does not require assessment | Does not require assessment | Does not require assessment | Does not require assessment | 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 | Benzo(b)fluoranthene | Details |
| RNAG | Unknown (pending investigation) | Unknown (pending investigation) | Sector under investigation | Benzo(g-h-i)perylene | Details |
| RNAG | Diffuse source | Other (not in list, must add details in comments) | Recreation | Phosphate | Details |
| RNAG | Diffuse source | Poor Livestock Management | Agriculture and rural land management | Phosphate | Details |
| RNAG | Point source | Sewage discharge (intermittent) | Water Industry | Fish | Details |
| RNAG | Point source | Misconnections | Water Industry | Fish | Details |
| RNAG | Point source | Incidents | Water Industry | Fish | Details |
| RNAG | Point source | Sewage discharge (intermittent) | Water Industry | Invertebrates | Details |
| RNAG | Point source | Urbanisation - urban development | Urban and transport | Phosphate | Details |
| RNAG | Measures delivered to address Reason, awaiting classification | Not applicable | No sector responsible | Mercury and Its Compounds | Details |
| RNAG | Measures delivered to address Reason, awaiting classification | Not applicable | No sector responsible | Polybrominated diphenyl ethers (PBDE) | Details |
| RNAG | Physical modification | Flood protection - structures | Other | Fish | Details |
| RNAG | Physical modification | Other (not in list, must add details in comments) | Local and Central Government | Mitigation Measures Assessment | Details |
| RNAG | Physical modification | Barriers - ecological discontinuity | Other | Fish | Details |
| RNAG | Physical modification | Other (not in list, must add details in comments) | Urban and transport | Mitigation Measures Assessment | 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 | 1 | 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 | 1 | 0 | 0 | 0 | 0 |
| Water Industry | 0 | 3 | 1 | 0 | 0 | 0 | 0 |
| Local & central government | 1 | 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 | 2 | 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 | 4 | 3 | 2 | 0 | 0 | 1 | 0 |
Objectives
| Classification Item | Status | Year | Reasons |
|---|---|---|---|
| Ecological | Good | 2027 | Disproportionately expensive: Disproportionate burdens; Disproportionately expensive: Unfavourable balance of costs and benefits; Natural conditions: Ecological recovery time |
| Biological quality elements | Moderate | 2027 | Disproportionately expensive: Unfavourable balance of costs and benefits; Natural conditions: Ecological recovery time |
| Fish | Moderate | 2027 | Disproportionately expensive: Unfavourable balance of costs and benefits; Natural conditions: Ecological recovery time |
| Invertebrates | Good | 2021 | |
| Macrophytes and Phytobenthos Combined | Not assessed | 2015 | |
| Physico-chemical quality elements | Good | 2027 | Disproportionately expensive: Disproportionate burdens |
| Ammonia (Phys-Chem) | Good | 2015 | |
| Dissolved oxygen | Good | 2015 | |
| Phosphate | Good | 2027 | 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 | Disproportionately expensive: Disproportionate burdens |
| Mitigation Measures Assessment | Good | 2027 | Disproportionately expensive: Disproportionate burdens |
| Specific pollutants | High | 2015 | |
| Triclosan | High | 2015 | |
| Chemical | Good | 2015 | |
| Priority hazardous substances | Does not require assessment | 2015 | |
| Priority substances | Does not require assessment | 2015 | |
| Other Pollutants | Does not require assessment | 2015 |
Protected areas
No data to show