Wensum US Norwich Water Body
Moderate ecological status
Get Wensum US Norwich data
Attributes
- Water Body IDGB105034055881
- Water Body TypeRiver
- Hydromorphological designationheavily modified
- NGRTF9648026962
- Length65.719 km
- Surveillance Water BodyYes
- Catchment area189.251 km2
- Natural England Revised WB Protected Area targetshttp://publications.naturalengland.org.uk/publication/5199706858717184
- Catchment area18925.14 ha
Classifications
| Classification Item | 2019 | 2022 |
|---|---|---|
| Ecological | Moderate | Moderate |
| Biological quality elements | Moderate | Moderate |
| Fish | High | High |
| Invertebrates | High | High |
| Macrophytes and Phytobenthos Combined | Moderate | Moderate |
| Macrophytes Sub Element | Moderate | Moderate |
| Phytobenthos Sub Element | Moderate | Moderate |
| Physico-chemical quality elements | Good | Good |
| Ammonia (Phys-Chem) | High | High |
| Biochemical Oxygen Demand (BOD) | High | |
| Dissolved oxygen | High | High |
| Phosphate | High | Good |
| Temperature | Good | High |
| pH | High | High |
| Hydromorphological Supporting Elements | Supports good | Supports good |
| Hydrological Regime | Does not support good | Does not support good |
| Supporting elements (Surface Water) | Moderate | Moderate |
| Mitigation Measures Assessment | Moderate or less | Moderate or less |
| Specific pollutants | High | High |
| Arsenic | High | High |
| Copper | High | High |
| Iron | High | High |
| Zinc | High | High |
| Chemical | Fail | Does not require assessment |
| Priority hazardous substances | Fail | Does not require assessment |
| 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 | Does not require assessment |
| Cypermethrin (Priority) | Good | |
| Fluoranthene | Good | |
| Lead and Its Compounds | Good | |
| Nickel and Its Compounds | Good | |
| Other Pollutants | 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 | Physical modification | Other (not in list, must add details in comments) | Local and Central Government | Mitigation Measures Assessment | Details |
| RNAG | Point source | Sewage discharge (continuous) | Water Industry | Macrophytes and Phytobenthos Combined | Details |
| RNAG | Flow | Surface water abstraction | Water Industry | Hydrological Regime | Details |
| RNAG | Flow | Groundwater abstraction | Water Industry | Hydrological Regime | Details |
| RNAG | Diffuse source | Poor nutrient management | Agriculture and rural land management | Macrophytes and Phytobenthos Combined | Details |
| RNAG | Flow | Groundwater abstraction | Other | Hydrological Regime | Details |
| RNAG | measures delivered to address reason, awaiting recovery | Not applicable | No sector responsible | Polybrominated diphenyl ethers (PBDE) | Details |
| RNAG | Flow | Surface water abstraction | Agriculture and rural land management | Hydrological Regime | Details |
| RNAG | Flow | Groundwater abstraction | Agriculture and rural land management | Hydrological Regime | 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 | 2 | 0 | 2 | 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 | 1 | 0 | 2 | 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 | 0 | 0 | 0 | 1 | 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 | 1 | 0 | 5 | 0 | 2 | 0 |
Objectives
| Classification Item | Status | Year | Reasons |
|---|---|---|---|
| Ecological | Moderate | 2015 | Disproportionately expensive: Disproportionate burdens; Technically infeasible: No known technical solution is available |
| Biological quality elements | Moderate | 2015 | Technically infeasible: No known technical solution is available |
| Fish | Good | 2015 | |
| Invertebrates | Good | 2015 | |
| Macrophytes and Phytobenthos Combined | Moderate | 2015 | Technically infeasible: No known technical solution is available |
| Physico-chemical quality elements | Good | 2015 | Disproportionately expensive: Disproportionate burdens |
| Ammonia (Phys-Chem) | High | 2015 | |
| Dissolved oxygen | High | 2015 | |
| Phosphate | High | 2021 | Disproportionately expensive: Disproportionate burdens |
| Temperature | Good | 2015 | |
| pH | Good | 2015 | |
| Hydromorphological Supporting Elements | Supports good | 2015 | |
| Hydrological Regime | Supports good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
| 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 | |
| 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 | |
| Cypermethrin (Priority) | Good | 2015 | |
| Fluoranthene | Good | 2015 | |
| Lead and Its Compounds | Good | 2015 | |
| Nickel and Its Compounds | Good | 2015 | |
| Other Pollutants | Does not require assessment | 2015 |
Protected areas
| PA Name | Id | Directive | More information |
|---|---|---|---|
| Wensum US Norwich | UKGB105034055881 | Drinking Water Protected Area | |
| Norwich Crag and Gravels | G79 | Nitrates Directive | |
| Anglian Chalk | G71 | Nitrates Directive | |
| River Wensum (SWSGZ1016 & SWSGZ1017) | SWSGZ1017 | Safeguard Zone | |
| River Wensum (SWSGZ1016 & SWSGZ1017) | SWSGZ1016 | Safeguard Zone | |
| River Wensum | UKENRI73 | Urban Waste Water Treatment Directive | |
| River Wensum | UK0012647 | Special Area of Conservation | 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.