Black Brook (Mersey Estuary) Water Body Moderate ecological status
Get Black Brook (Mersey Estuary) data Attributes Water Body ID GB112069061230 Water Body Type River Hydromorphological designation heavily modified NGR SJ5185599455 Catchment area 2243.22 ha Length 12.547 km Catchment area 22.432 km2 Surveillance Water Body No Classifications Classification Item 2019 2022 Ecological Moderate Moderate Biological quality elements Moderate Moderate Fish Moderate Moderate Invertebrates Moderate Moderate Macrophytes and Phytobenthos Combined Macrophytes Sub Element Moderate Moderate Physico-chemical quality elements High Moderate Ammonia (Phys-Chem) High High Biochemical Oxygen Demand (BOD) High Dissolved oxygen High High Phosphate High Poor Temperature High High pH High High Hydromorphological Supporting Elements Supports good Supports good Hydrological Regime High High 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 Fail 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
Why do all water bodies have a chemical status of fail?
Investigations into classification status Classification Element Cycle Year Status Outcome Phosphate 2 2016 High Quite certain there is a problem
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 Point source Sewage discharge (continuous) Water Industry Phosphate Details RNAG measures delivered to address reason, awaiting recovery Not applicable No sector responsible Polybrominated diphenyl ethers (PBDE) Details RNAG Physical modification Recreation Recreation Invertebrates Details RNAG Physical modification Flood protection - structures Urban and transport Invertebrates Details RNAG measures delivered to address reason, awaiting recovery Not applicable No sector responsible Mercury and Its Compounds Details RNAG Point source Abandoned mine Mining and quarrying Invertebrates Details RNAG Point source Abandoned mine Mining and quarrying Fish Details RNAG Physical modification Barriers - ecological discontinuity Recreation Fish Details RNAG Physical modification Other (not in list, must add details in comments) Sector under investigation Mitigation Measures Assessment Details RNAG Physical modification Other (not in list, must add details in comments) Sector under investigation 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 0 0 Industry 0 0 0 0 0 0 0 Mining and quarrying 0 0 0 0 0 0 2 Navigation 0 0 0 0 0 0 0 Urban and transport 0 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 2 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 2 0 0 0 0 0 0 Total 4 1 0 0 0 0 2
Objectives Classification Item Status Year Reasons Ecological Good 2027 - Low confidence Disproportionately expensive: Disproportionate burdens Biological quality elements Good 2027 - Low confidence Disproportionately expensive: Disproportionate burdens Fish Good 2027 - Low confidence Disproportionately expensive: Disproportionate burdens Invertebrates Good 2027 - Low confidence Disproportionately expensive: Disproportionate burdens Macrophytes and Phytobenthos Combined Not assessed 2015 Disproportionately expensive: Disproportionate burdens Physico-chemical quality elements Good 2015 Ammonia (Phys-Chem) Good 2015 Dissolved oxygen Good 2015 Phosphate Good 2015 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 Mitigation Measures Assessment Good 2027 - Low confidence Disproportionately expensive: Disproportionate burdens 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 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 Sankey Brook (Black Bk to Mersey) NVZ S639 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.
Monitoring Site Cycle 1 Cycle 2 Cycle 3 MERSEY/SANKEY BROOK/SABL05/ 12485 2010, 2009, 2013, 2011, 2014, 2012 2015, 2013, 2016, 2014 CLIPSLEY BROOK PTC BLACK BROOK 88002671 2010, 2013, 2009, 2011, 2014, 2012 2015, 2016, 2019, 2013, 2014 2019 BLACK BROOK 5 METRES PTC SANKEY BROOK 88009756 2013, 2014, 2011, 2012 2015, 2016, 2019, 2013, 2014 2019, 2022 67712 67712 2009, 2014 2015, 2016, 2014 65579 65579 2014 2015, 2016, 2014