Thelnetham Brook Water Body Moderate ecological status
Get Thelnetham Brook data Attributes Water Body ID GB105033043040 Water Body Type River Hydromorphological designation heavily modified NGR TM0031176786 Catchment area 11.885 km2 Surveillance Water Body No Length 6.102 km Catchment area 1188.45 ha Classifications Classification Item 2019 Ecological Moderate Biological quality elements Moderate Invertebrates Moderate Macrophytes and Phytobenthos Combined Macrophytes Sub Element Moderate Physico-chemical quality elements Moderate Ammonia (Phys-Chem) High Dissolved oxygen Moderate Phosphate Moderate Temperature High pH High Hydromorphological Supporting Elements Supports good Hydrological Regime High Supporting elements (Surface Water) Moderate Mitigation Measures Assessment Moderate or less Chemical Fail Priority hazardous substances Fail 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 Good Perfluorooctane sulphonate (PFOS) Good Polybrominated diphenyl ethers (PBDE) Fail Priority substances Good Cypermethrin (Priority) Good Fluoranthene Good Other Pollutants 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 Dissolved oxygen 2 2014 Moderate Uncertain there is a problem Phosphate 2 2013 Moderate Very certain there is a problem Ammonia (Phys-Chem) 2 2016 Good Certain there is not a problem Dissolved oxygen 2 2016 Poor 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 Private Sewage Treatment Domestic General Public Phosphate Details RFD Flow Low Flow (not drought) No sector responsible Dissolved oxygen Details RNAG Point source Private Sewage Treatment Domestic General Public Dissolved oxygen Details RNAG Diffuse source Poor nutrient management Agriculture and rural land management Invertebrates Details RNAG Diffuse source Poor Livestock Management Agriculture and rural land management Dissolved oxygen Details RNAG Diffuse source Poor nutrient management Agriculture and rural land management Dissolved oxygen Details RFD High to Good deterioration, no action required (RFD only) Not applicable No sector responsible Ammonia (Phys-Chem) Details RNAG Physical modification Land drainage Agriculture and rural land management Invertebrates Details RNAG Diffuse source Poor nutrient management Agriculture and rural land management Phosphate Details RNAG Natural Drought No sector responsible Invertebrates Details RNAG Diffuse source Poor nutrient management Agriculture and rural land management Phosphate Details RNAG Point source Private Sewage Treatment Domestic General Public Invertebrates Details RNAG Diffuse source Poor nutrient management Agriculture and rural land management Invertebrates Details RNAG Point source Private Sewage Treatment Domestic General Public Invertebrates Details RNAG measures delivered to address reason, awaiting recovery Not applicable No sector responsible Polybrominated diphenyl ethers (PBDE) Details RNAG Natural Drought No sector responsible Invertebrates Details RNAG Diffuse source Poor nutrient management Agriculture and rural land management Invertebrates 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 1 0 0 0 0 5 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 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 0 0 0 0 5 0
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 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 2027 - Low confidence Disproportionately expensive: Disproportionate burdens Ammonia (Phys-Chem) Good 2015 Dissolved oxygen Good 2027 - Low confidence Disproportionately expensive: Disproportionate burdens Phosphate Good 2027 - Low confidence 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) Not assessed 2015 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 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 Other Pollutants Does not require assessment 2015
Protected areas PA Name Id Directive More information Ely Ouse and Cut-off channel NVZ S390 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 TRIB.LT.OUSE CHURCH LN RD.BR. THELNETHAM 42M24 2012, 2013, 2014 2016, 2019, 2015, 2013, 2014 2019 154069 154069 2014, 2013 2016, 2019, 2014, 2015, 2013 2019 LT.OUSE R. BLO NORTON FORD 42M04 2009 LOWER OUSE/LT OUSE/U/S LT OUSE/THELNETHAM ROAD BRIDGE/ 34370 2013