Wonston Brook Water Body
Poor ecological status
Get Wonston Brook data
Attributes
- Water Body IDGB108043015900
- Water Body TypeRiver
- Hydromorphological designationnot designated artificial or heavily modified
- NGRST7450906597
- Catchment area15.013 km2
- Surveillance Water BodyYes
- Length10.366 km
- Catchment area1501.34 ha
Classifications
| Classification Item | 2019 |
|---|---|
| Ecological | Poor |
| Biological quality elements | Poor |
| Fish | Poor |
| Invertebrates | Good |
| Macrophytes and Phytobenthos Combined | Poor |
| Macrophytes Sub Element | Good |
| Phytobenthos Sub Element | Poor |
| Physico-chemical quality elements | Moderate |
| Acid Neutralising Capacity | High |
| Ammonia (Phys-Chem) | Good |
| Dissolved oxygen | Moderate |
| Phosphate | Moderate |
| Temperature | Good |
| pH | High |
| Hydromorphological Supporting Elements | Supports good |
| Hydrological Regime | Supports good |
| Morphology | Supports good |
| Specific pollutants | High |
| Copper | High |
| Chemical | Fail |
| Priority hazardous substances | Fail |
| Anthracene | Good |
| Benzo(a)pyrene | Good |
| Benzo(b)fluoranthene | Good |
| Benzo(g-h-i)perylene | Fail |
| Benzo(k)fluoranthene | 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 |
| Perfluorooctane sulphonate (PFOS) | Good |
| Polybrominated diphenyl ethers (PBDE) | Fail |
| Priority substances | Good |
| Cypermethrin (Priority) | Good |
| Fluoranthene | 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 | Physical modification | Barriers - ecological discontinuity | Other | Fish | Details |
| RNAG | Diffuse source | Poor Livestock Management | Agriculture and rural land management | Fish | Details |
| RNAG | measures delivered to address reason, awaiting recovery | Not applicable | No sector responsible | Mercury and Its Compounds | Details |
| RNAG | Diffuse source | Poor Livestock Management | Agriculture and rural land management | Phosphate | Details |
| RNAG | Unknown (pending investigation) | Unknown (pending investigation) | Sector under investigation | Benzo(g-h-i)perylene | Details |
| RNAG | measures delivered to address reason, awaiting recovery | Not applicable | No sector responsible | Polybrominated diphenyl ethers (PBDE) | Details |
| RNAG | Point source | Farm/site infrastructure | Agriculture and rural land management | Macrophytes and Phytobenthos Combined | Details |
| RNAG | Unknown (pending investigation) | Unknown (pending investigation) | Sector under investigation | Dissolved oxygen | Details |
| RNAG | Diffuse source | Poor Livestock Management | Agriculture and rural land management | Macrophytes and Phytobenthos Combined | 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 | 4 | 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 | 0 | 0 | 0 | 0 | 0 |
| Water Industry | 0 | 0 | 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 | 1 | 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 | 0 | 0 | 0 | 0 | 4 | 0 |
Objectives
| Classification Item | Status | Year | Reasons |
|---|---|---|---|
| Ecological | Poor | 2021 | Disproportionately expensive: Disproportionate burdens; Disproportionately expensive: Unfavourable balance of costs and benefits |
| Biological quality elements | Poor | 2021 | Disproportionately expensive: Disproportionate burdens; Disproportionately expensive: Unfavourable balance of costs and benefits |
| Fish | Poor | 2021 | Disproportionately expensive: Disproportionate burdens |
| Invertebrates | Good | 2021 | Disproportionately expensive: Disproportionate burdens |
| Macrophytes and Phytobenthos Combined | Poor | 2015 | Disproportionately expensive: Disproportionate burdens; Disproportionately expensive: Unfavourable balance of costs and benefits |
| Physico-chemical quality elements | Moderate | 2015 | Disproportionately expensive: Disproportionate burdens; Disproportionately expensive: Unfavourable balance of costs and benefits |
| Acid Neutralising Capacity | Good | 2015 | |
| Ammonia (Phys-Chem) | Good | 2015 | |
| Dissolved oxygen | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
| Phosphate | Moderate | 2015 | Disproportionately expensive: Unfavourable balance of costs and benefits |
| Temperature | Good | 2015 | |
| pH | Good | 2015 | |
| Hydromorphological Supporting Elements | Supports good | 2015 | |
| Hydrological Regime | Supports good | 2015 | |
| Supporting elements (Surface Water) | Not assessed | 2015 | |
| Specific pollutants | High | 2015 | |
| Copper | High | 2015 | |
| Chemical | Good | 2063 | Natural conditions: Chemical status recovery time; Technically infeasible: No known technical solution is available |
| Priority hazardous substances | Good | 2063 | Natural conditions: Chemical status recovery time; Technically infeasible: No known technical solution is available |
| Anthracene | Good | 2015 | |
| Benzo(a)pyrene | Good | 2015 | |
| Benzo(b)fluoranthene | Good | 2015 | |
| Benzo(g-h-i)perylene | Good | 2033 | Technically infeasible: No known technical solution is available |
| Benzo(k)fluoranthene | 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 | 2040 | Natural conditions: Chemical status recovery time |
| 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 |
|---|---|---|---|
| South Wessex | G151 | Nitrates Directive | |
| Poole Harbour | ET1 | Nitrates Directive |
Monitoring sites which have been used to classify this water body
Shows which sites were used for classification for which years within each cycle.