Thames Water Severn Thames Transfer Water quality and ecology - PowerPoint PPT Presentation

Severn Thames Transfer Water quality and ecology assessment Phase 2 Update on Next Steps with Flow Studies Awaited: • 1920-2010 lower River Severn flow series to be completed (by HR Wallingford) • Water Resources modelling undertaken for baseline and each option using the two indicative operating conventions (by Thames Water) Next steps: • Completion of baseline characterisation of river flows in the study area • Assessment of general transfer requirement pattern for each of the two indicative operating conventions • Assessment , for each option , of the: • Transfer pattern (volume, timing (season and duration), regularity) • Resultant (lower or neutral) flows in the lower River Severn • Resultant (higher) flows in the River Thames at selected locations • Incorporation of flow assessment findings into water quality and ecological assessment of scheme variants. From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Session 3 – Water Quality From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Environmental water quality data analysis: Overview • Water quality assessment considers likely impacts on river water quality and subsequent risks to the different abstraction and discharge areas. • Likely changes in river water quality considered against a baseline of current river water quality in River Severn and River Thames. • Assessment takes account of extent of deviation from Good Ecological Status (GES) / Good Ecological Potential (GEP) and relevant WFD quality standards • All potential variants of transfer scheme considered, with varying levels of assessment proportionate to level of current and future risk. • Drinking water quality considered separately against Drinking Water Safety Plans. From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 WQ data analyses: Baseline approach Phase 2 Water Quality parameters Heavy metals: Pollutants: General: Nutrients: 1. Copper 1. Bromide 1. pH 1. Reactive phosphorus 2. Zinc 2. Bromate 2. Dissolved oxygen 2. Silicate 3. Iron 3. Metaldehyde 3. Temperature 3. Nitrate. 4. Chromium 4. Phenols 4. Biochemical Oxygen 5. Mercury. 5. Total pesticides Demand 6. Tributyltin. 5. Ammonia 6. Turbidity 7. Suspended solids 8. Alkalinity 9. Dissolved organic carbon 10. Colour WFD Physico-chemical substances 11. Conductivity WFD Specific Pollutants (Annex VIII) 12. Chlorophyll a WFD Priority Substances (Annex X) From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 WQ data analyses: Baseline approach From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 WQ data analyses: Baseline approach Environment Agency data used for River Thames and River Severn Bristol Water data used for Gloucester & Sharpness Canal. Site selection criteria: • Proximity to abstraction/discharge location, including other influences • Length and completeness of dataset available (2003-2013), including suite of determinants • For incomplete datasets, sites were combined. Statistical testing for differences undertaken for each determinand prior to combining sites: • Downstream of Cricklade two available sites but statistically significantly different – the site closest to the outlet was selected. • Severn upstream of Uckinghall and Thames downstream of Lechlade and Culham, data was not significantly different – sites were combined for robustness and completeness From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 WQ data analyses: Baseline approach From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 WQ data analyses: Baseline approach Baseline water quality data reviewed to determine: • Extent of variability and spatial patterns: i.e. between sites on River Severn and River Thames and between proposed abstraction and discharge locations • Seasonal variability • Variability with flow, including wet vs dry years • Long term trends based on 10-year dataset (2003-2013) and extent of deviation from GES/GEP • Baseline characterisation used to assess change indicated by modelled scenario runs. From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Approach to assessing variability in environmental water quality 5% Outliers 95 percentile Quartile 3 – 75% Quartile 2 – 50% (Median) Quartile 1 – 25% 5 percentile 5% outliers Severn Sites: Blue – Upton, Red – d/s Uckinghall, u/s Deerhurst, Gold = d/s Deerhurst, u/s G&S Canal From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Approach to characterising seasonal and longer term variability in environmental water quality Raw data points Running mean line – based on 1yr of data From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Approach to characterising water quality variability with flow Example: Suspended solids in the River Severn Top 10% ‘driest year’ Top 10% ‘wettest year’ Top 10% ‘driest years’ Top 10% ‘wettest year’ Flow statistics were used to categorise low flow, typical flow and high flow years. Also, concentrations typically higher down the catchment compared to upper reaches From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 WQ data analyses: pH Severn Gloucester & Sharpness Canal Thames at Cricklade Thames at Lechlade Thames at Culham From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 WQ data analyses: dissolved oxygen Severn Gloucester & Sharpness Canal No data available No data available Thames at Cricklade Thames at Lechlade Thames at Culham From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 WQ data analyses: temperature Severn Gloucester & Sharpness Canal Thames at Cricklade Thames at Lechlade Thames at Culham From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 WQ data analyses: suspended solids Severn Gloucester & Sharpness Canal No data available No data available Thames at Cricklade Thames at Lechlade Thames at Culham From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 WQ data analyses: chlorophyll a Severn Gloucester & Sharpness Canal No data available No data available Thames at Cricklade Thames at Lechlade Thames at Culham From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 WQ data analyses: soluble reactive phosphorus Severn Gloucester & Sharpness Canal No data available No data available Thames at Cricklade Thames at Lechlade Thames at Culham From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 WQ data analyses: ammonia Severn Gloucester & Sharpness Canal No data available No data available Thames at Cricklade Thames at Lechlade Thames at Culham From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 WQ data analyses: nitrate Severn Gloucester & Sharpness Canal No data available No data available Thames at Cricklade Thames at Lechlade Thames at Culham From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Environmental water quality baseline findings • Acidity (pH) comparable between catchments • Dissolved Oxygen typically high and comparable between catchments • Temperature comparable between catchments • Ammonia comparable between Severn and Thames at Cricklade and Lechlade, but higher at Culham • Chlorophyll a higher in Severn compared to Thames at Cricklade, but comparable between the Severn and Thames at Culham • Suspended solids higher in Severn compared to Thames, positive relationship with wetter years • Soluble Reactive Phosphorus showing reduction in concentration over time, slightly higher in Severn compared with Lechlade and Culham, Cricklade more variable of Thames sites • Nitrate displaying seasonal variability and higher in Gloucester & Sharpness Canal compared to Severn and Thames, Severn and Thames comparable From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Review of Phase 1 findings against Phase 2 initial environmental water quality work Water Quality • High Risk: Phosphorus , Algae , Metaldehyde, Bromide, Cryptosporidium • Moderate Risk: Copper , Zinc , Nitrates and Nitrites • Low volume (100Ml/d) transfers via Culham or Lechlade unlikely to present risk to compliance • From water quality perspective transfers to Cricklade are least viable options Next steps • Detailed assessment through water quality modelling, linked to variants through hydrology assessment From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Drinking water quality data analysis: Overview • Under Water Industry Act 1991 (amended by Water Act 2003) Thames Water has statutory requirement to ensure that risks to drinking water quality are adequately managed. • Assessment considers likely impacts on drinking water quality and the subsequent risks to abstractors at relevant locations in study area • Likely changes in drinking water are being considered against a baseline of current drinking water quality risks, as summarised in the appropriate water company Drinking Water Safety Plan(s) (DWSP). • All potential variants of transfer will be considered, with varying levels of assessment proportionate to level of current and future risk. From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Drinking Water Quality analysis: Approach From policy to practice

Severn Thames Transfer Part A: What are the likely substances? Water quality and ecology assessment Phase 2 1. Alkalinity 10. Turbidity 2. Bromate 11. Clopyralid 3. Conductivity 12. Colour 4. Sodium 13. Mecoprop 5. Carbetamide 14. pH 6. Metaldehyde 15. Chloride 7. Sulphate 16. Calcium 8. Magnesium 17. Total dissolved solids* 9. Propyzamide 18. Cryptosporidium* *not yet assessed From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Part B: Are there any differences in source quality and intake quality? B1 - Primary screen for each substance for all sources and intakes with removal of substances without risk . B2 - Secondary screen for all remaining substances for all sources, reducing uncertainty by incorporating likely flows and seasons that the scheme would operate, with removal of substances without risk. Part C: What is the extent of change in drinking water safety risk? Remaining list of 'risk' substances is assessed for drinking water safety risk for each transfer variant and operating scenario. Current DWSP red-amber-green categorisation of risks, as set out at the catchment scale, will provide the baseline. General evidence from the secondary screen will be used to inform possible category changes that may associate with a transfer From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Metaldehyde: Phase B1 – Demonstration of approach • 90 th percentiles within PCV for all sites (2004-2014). • PCV exceedances at all sites, in particular Purton • No data available at Haw Bridge (representative of Deerhurst) All sites screened-in to Phase B2 (subject to data availability) From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Flows most likely that scheme will operate in Metaldehyde: Phase B2 – Demonstration of approach Concentration range most likely to be transferred based on flow range Mythe WTW Purton Datchet Farmoor

Severn Thames Transfer Water quality and ecology assessment Phase 2 Drinking water quality analysis From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Drinking water quality analysis Magnesium Sulphate Propyzamide Turbidity Clopyralid Colour From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Drinking water quality analysis From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Summary of Drinking Water findings to date • 16 of 18 initial substances have been assessed to date. Screening assessment of cryptosporidium and total dissolved solids to be undertaken in due course. • Safe to screen out some substances at phase B1 based on measured concentrations against PCV across all sites • At least 7 substances require assessment in Phases B2/C2 • Pesticide exceedances common across all sites (namely Carbetamide, Metaldehyde, Propyzamide, Chlorpiralid and Mecoprop) • Colour/turbidity exceedances also common • Varied data availability between sites limits definitive conclusions for some substances. From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Review of Phase 1 findings against Phase 2 initial drinking water quality work Water Quality • High Risk: Phosphorus, Algae, Metaldehyde , Bromide , Cryptosporidium • Moderate Risk: Copper, Zinc, Nitrates and Nitrites • Low volume (100Ml/d) transfers via Culham or Lechlade unlikely to present risk to compliance • From water quality perspective transfers to Cricklade are least viable options From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Drinking Water Quality Next steps • Agree full suite of substances and those which are screened in/out • Confirm current DWSP risk at each WTW (from recently revised DWSPs) • Establish the envelope of changed of DWSP risk from a transfer against the baseline in the appropriate water company Drinking Water Safety Plan(s) (DWSP). • Seek agreement on the approach with relevant water supply companies (namely Severn Trent Water, Bristol Water, Affinity Water and South East Water) on: • inclusion/ exclusion of certain substances of interest • establish their preferred level of involvement going forward. From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Model calibration and validation From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Severn flow calibration and validation Deerhurst Haw Bridge From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Severn WQ calibration and validation Chaceley Stock Ashleworth Maisemore Weir Haw Bridge Westgate Bridge Severn footbridge From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 River Severn calibration & validation • Overview • Calibration and validation of flows is good • Calibration and validation of water quality is as good as possible – Model replicates magnitude of concentration and general trends – Model produces some peaks and lows in concentration that are not picked up by monitoring – Model does not replicate monitoring outliers – are the outliers accurate readings? – Strong fits: » BOD, PO 4 , TON, Temp, Ammonia, Silicate – Weaker fits: » Zn, Cu, Chl, SS, DO From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Flows - Nash-Sutcliffe efficiency Severn location 2007 2010 2011 Deerhurst 0.91 0.87 0.98 Haw Bridge 0.88 0.89 0.95 Thames location 2003 2004 2011 Farmoor 0.85 0.70 0.79 Maidenhead 0.93 0.78 0.84 Reading 0.97 0.80 0.95 Staines 0.96 0.83 0.87 Sutton Courtenay 0.98 0.96 0.99 Teddington 0.94 0.76 0.88 Walton 0.94 0.77 0.83 Windsor 0.80 0.90 0.90 From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Deerhurst flows 2007 2011 Issue with observed data 2010 Nash-Sutcliffe efficiency Severn 2007 2010 2011 location Deerhurst 0.91 0.87 0.98 From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Haw Bridge flows 2007 2011 2010 Nash-Sutcliffe efficiency Severn 2007 2010 2011 location Haw Bridge 0.88 0.89 0.95 From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Ashleworth WQ 2011 PO 4 Silicate (mg/l) (mg/l) Good fits Cu Zn (ug/l) (ug/l) Weaker fit From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Haw Bridge WQ 2010 Chl (mg/l) SS (mg/l) TON Ammonia (mg/l) (mg/l) Good fits From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Maisemore Weir WQ 2007 Good fit BOD DO (mg/l) (mg/l) ok DO Temp (% sat) (˚C) ok Good fit From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Upper Thames flow & WQ calibration and validation From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Lower Thames flow calibration and validation Sutton Courtenay Windsor Teddington Maidenhead Reading Staines Walton From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Lower Thames WQ calibration and validation Donnington Bridge Radley Wallingford Sutton Bridge Boveney Weir Teddington Caversham Weir Walton From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 River Thames calibration & validation • Overview • Calibration and validation of flows is generally good • Calibration and validation of water quality is as good as possible – Model replicates magnitude of concentration and general trends – Model produces some peaks and lows in concentration that are not picked up by monitoring – Model does not replicate monitoring outliers – are the outliers accurate readings? – Goodness of fit varies from site to site for the same parameter – Strong fits: » BOD, DO, SS, PO 4 , Temp, Ammonia, Silicate – Weaker fits: » Chl, TON, Zn, Cu From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Farmoor flows 2011 2003 2004 Nash-Sutcliffe efficiency Thames 2003 2004 2011 location Farmoor 0.85 0.70 0.79 From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Teddington flows 2011 2003 2004 Nash-Sutcliffe efficiency Thames 2003 2004 2011 location Teddington 0.94 0.76 0.88 From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Farmoor WQ calibration 2003 BOD (mg/l) DO DO (mg/l) (% sat) SS (mg/l) Temp Chl Weaker fit (˚C) (mg/l) Good fits From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Farmoor WQ calibration 2003 PO 4 Ammonia (mg/l) (mg/l) TON (mg/l) Silicate Zn (ug/l) (mg/l) Cu (ug/l) Good fits From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Farmoor validation 2011 BOD (mg/l) DO DO (mg/l) (% sat) Temp SS (mg/l) Chl (˚C) (mg/l) Weaker fit Good fits From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Farmoor validation 2011 Weaker fit Ammonia PO 4 (mg/l) (mg/l) TON (mg/l) Silicate Cu Zn (mg/l) (ug/l) (ug/l) Good fits From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Teddington WQ calibration 2004 DO BOD (% sat) (mg/l) DO (mg/l) SS (mg/l) Temp Chl (˚C) (mg/l) Weaker fit Good fits From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Teddington validation 2011 Ammonia TON PO 4 (mg/l) (mg/l) (mg/l) Zn Silicate (ug/l) (mg/l) Cu (ug/l) Weaker fit Good fits From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Water quality modelling results From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Modelled scenarios Variant R. Severn abstraction location R. Thames discharge location Unsupported via 3a 300 Ml/d Pipeline intake at Deerhurst Cricklade discharge pipeline Unsupported via 3b 300 Ml/d Pipeline intake at Deerhurst Culham discharge pipeline Unsupported via Intake to canal at Gloucester 5 240 Ml/d Inglesham (near Lechlade) Canal Docks / Saul’s Junction Intake at Uckinghall reservoir Supported via 7a 600 Ml/d Transfer directly from reservoir Cricklade discharge pipeline via pipeline Intake at Uckinghall reservoir Supported via 7b 600 Ml/d Culham discharge Transfer directly from reservoir pipeline via pipeline Intake at Uckinghall reservoir Supported via 9 Intake to canal at Gloucester Inglesham (near Lechlade) 240 Ml/d Canal Docks / Saul’s Junction From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Assumptions • River Severn • The transfer runs every model time step when flow > HOF – HOF 1 = 1,800 Ml/d – no abstraction – HOF 2 = 2,490 Ml/d – abstraction limited to 240 Ml/d • No impact on the main River Severn for unsupported canal variant (5) • River Thames • The transfer runs every day in 2011 • Pipeline transfer – WQ of the previous day (-24 hours) from the Severn is added to the Thames to allow for transfer time • Canal transfer - WQ of the previous week (-7 days) from the Severn is added to the Thames to allow for transfer time • Supported variants – simple calculation to take account of long reservoir residence time From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Results locations Severn Thames Cricklade  Uckinghall Mythe  Lechlade  Deerhurst  Farmoor   Results presented in G & S canal intake  Culham  slides Caversham Weir Bray Sunnymeads and Datchet Staines and Egham Laleham Chertsey Walton (Affinity Water abstraction) Walton (Thames Water abstraction)  Teddington  From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 WQ parameters Complete In progress Temperature Metaldehyde Suspended solids Bromide BOD  Results  Organic nitrogen presented in slides Dissolved Oxygen  Ammonia  Total Oxidised Nitrogen (TON)  Orthophosphate  Silicate Chlorophyll Cu Zn  Cryptosporidium – not included in model From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Results overview • River Severn • Minimal change from baseline WQ at Mythe, Deerhurst and the G&S canal intake • River Thames • Cricklade – Scenarios > baseline for Zn – Scenarios < baseline for TON, PO 4 • Lechlade – Scenarios > baseline for Zn – Scenarios < baseline for BOD, Ammonia, TON, PO 4 • Farmoor – Scenarios > baseline for Zn – Scenarios < baseline for TON, Ammonia • Culham, Sunnymeads & Datchet – Scenarios > baseline for Zn – Scenarios < baseline for TON, Ammonia – Scenario 7 < baseline for PO 4 , BOD • Walton (Thames Water abstraction) – Minor change from baseline WQ – Scenarios < baseline for TON, PO 4, Ammonia • Teddington – Scenarios < baseline for TON, PO 4 From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Severn Mythe BOD (mg/l) PO 4 (mg/l) Cu (ug/l) Minimal change from baseline WQ Zn (ug/l) TON (mg/l) Chl (mg/l) From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Severn Deerhurst BOD (mg/l) PO 4 (mg/l) Cu (ug/l) Minimal change from baseline WQ Zn (ug/l) TON (mg/l) Chl (mg/l) From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Severn G&S canal intake BOD (mg/l) PO 4 (mg/l) Cu (ug/l) Minimal change from baseline WQ Zn (ug/l) TON (mg/l) Chl (mg/l) From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Thames Cricklade BOD (mg/l) PO 4 (mg/l) DO (mg/l) Some changes from baseline WQ TON (mg/l) Ammonia (mg/l) Zn (ug/l) From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Thames Lechlade BOD (mg/l) PO 4 (mg/l) DO (mg/l) Some changes from baseline WQ Zn (ug/l) TON (mg/l) Ammonia (mg/l) From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Thames Farmoor BOD (mg/l) PO 4 (mg/l) DO (mg/l) Some changes from baseline WQ Zn (ug/l) TON (mg/l) Ammonia (mg/l) From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Thames Culham BOD (mg/l) PO 4 (mg/l) DO (mg/l) Some changes from baseline WQ Zn (ug/l) TON (mg/l) Ammonia (mg/l) From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Thames Sunnymeads & Datchet BOD (mg/l) PO 4 (mg/l) DO (mg/l) Some changes from baseline WQ Zn (ug/l) TON (mg/l) Ammonia (mg/l) From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Thames Walton (TW abstraction) BOD (mg/l) PO 4 (mg/l) DO (mg/l) Some changes from baseline WQ Zn (ug/l) TON (mg/l) Ammonia (mg/l) From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Thames Teddington BOD (mg/l) PO 4 (mg/l) DO (mg/l) Some changes from baseline WQ TON (mg/l) Ammonia (mg/l) Cu (ug/l) From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Longitudinal variation Ammonia (mg/l) PO 4 (mg/l) Flow (Ml/day) From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Overall findings • River Severn • Minimal change from baseline WQ • River Thames • There are some changes from baseline WQ • These changes diminish in the downstream reaches of the Thames From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 14:30 – Afternoon Break From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Session 4 – Ecology From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Ecology - WFD From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 WFD: Overview • WFD work reviews status of WFD waterbodies in the Severn and Thames over time, using reported status (RBMP1) and interim status updates. • Will consider likely impacts on WFD status, achievement of Good Ecological Status (GES)/Good Ecological Potential (GEP) in each WFD waterbody and if scheme has potential to prevent waterbodies from achieving GES/GEP in future. • All potential variants of the transfer scheme will be considered, with varying levels of assessment proportionate to the level of current and perceived future risk. From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 WFD: RBMP1 (2009) Status Waterbody ID Waterbody name Designation Overall Overall Fish Inverts Plants Diatoms Ammonia DO pH Phosphate Temp status ecological status Severn GB109054039760 River Severn – conf R Teme to Heavily Modified Moderate Moderate High Poor High High High Poor High conf R Avon (Flood, Nav, Urban) GB109054044404 River Severn – conf R Avon to Heavily Modified Moderate Moderate Poor High High High Poor High conf Upper Parting (Flood, Nav, Urban) Gloucester & Sharpness Canal GB70910509 Gloucester and Sharpness Artificial Moderate Moderate High High Moderate High Canal (Nav) Thames GB106039030170 Thames (Source to Kemble) Not Designated Good Good High High High High High A/HMWB GB106039023760 Thames (Kemble to Waterhay Not Designated Poor Poor Poor Good High High High High High Bridge A/HMWB GB106039022960 Thames (Waterhaybridge to Not Designated Moderate Moderate Moderate High High High High High Cricklade) and Chelworth A/HMWB Brook GB106039022990 Thames Not Designated Poor Poor Moderate Good Poor High High High Moderate High (Churn to Coln) A/HMWB GB106039023240 Thames (Coln to Leach) Heavily Modified Moderate Moderate High (Nav) GB106039029992 Thames (Leach to Evenlode) Not Designated Moderate Moderate Moderate Good High High High Moderate High A/HMWB GB106039030334 Thames (Evenlode to Thame) Not Designated Poor Poor Good Poor High High High Moderate High A/HMWB GB106039030331 Thames Wallingford to Heavily Modified Moderate Moderate Bad High High High Moderate High Caversham (Flood, Navigation) GB106039023233 Thames (Reading to Cookham) Heavily Modified (Flood, Moderate Moderate High Good High High High Moderate High Nav, Water storage) GB106039023231 Thames (Cookham to Egham) Heavily Modified Moderate Moderate High High High High High Moderate High (Flood, Nav, Water) GB106039023232 Thames (Egham to Heavily Modified Poor Poor High Good Good Poor High High High Moderate High Teddington) (Flood, Nav, Water)

Severn Thames Transfer Water quality and ecology assessment Phase 2 WFD: RBMP1 (2009) Waterbodies - Status From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 WFD: RBMP2 (2014) Interim Status (not reported) Waterbody ID Waterbody name Designation Overall Overall Fish Inverts Plants & Diatoms Ammonia DO pH Phosphate Temp status ecological status Severn GB109054039760 River Severn – conf R Teme to Heavily Modified Moderate Moderate Moderate High High High Poor High conf R Avon (Flood, Nav, Urban) GB109054044404 River Severn – conf R Avon to Heavily Modified Moderate Moderate Moderate Good High High High Poor High conf Upper Parting (Flood, Nav, Urban) GB70910509 Gloucester and Sharpness Artificial Moderate Moderate High Good High Moderate High Canal (Nav) GB106039023760 Thames (Kemble to Waterhay Not Designated Moderate Moderate Good High Good High Moderate High High High Bridge A/HMWB GB106039022960 Thames (Waterhaybridge to Not Designated Moderate Moderate High High Moderate High Moderate High Good High Cricklade) and Chelworth A/HMWB Brook GB106039022990 Thames Not Designated Moderate Moderate High High High Poor High (Churn to Coln) A/HMWB GB106039029992 Coln (from Coln Rogers) and Not Designated Moderate Moderate High Moderate High High High Good High Thames (Coln to Leach) A/HMWB GB106039029992 Thames (Leach to Evenlode) Not Designated Poor Poor Poor Poor High High High Moderate High A/HMWB GB106039030334 Thames (Evenlode to Thame) Not Designated Moderate Moderate Moderate Moderate High High Poor Moderate High A/HMWB GB106039030331 Thames Wallingford to Heavily Modified Moderate Moderate Moderate High High High Poor High Caversham (Flood, Navigation) GB106039023233 Thames (Reading to Cookham) Heavily Modified (Flood, Moderate Moderate High High High High Moderate High Nav, Water storage) GB106039023231 Thames (Cookham to Egham) Heavily Modified Moderate Moderate High High High High Moderate High (Flood, Nav, Water) GB106039023232 Thames (Egham to Heavily Modified Poor Poor Good Poor High High High Moderate High Teddington) (Flood, Nav, Water)

Severn Thames Transfer Water quality and ecology assessment Phase 2 WFD: RBMP2 (2014) Interim Status (not reported) Waterbody ID Waterbody name Designation Overall Overall Fish Inverts Plants & Diatoms Ammonia DO pH Phosphate Temp status ecological status Severn GB109054039760 River Severn – conf R Teme to Heavily Modified Moderate Moderate Moderate High High High Poor High conf R Avon (Flood, Nav, Urban) GB109054044404 River Severn – conf R Avon to Heavily Modified Moderate Moderate Moderate Good High High High Poor High conf Upper Parting (Flood, Nav, Urban) GB70910509 Gloucester and Sharpness Artificial Moderate Moderate High Good High Moderate High Canal (Nav) GB106039023760 Thames (Kemble to Waterhay Not Designated Moderate Moderate Good High Good High Moderate High High High Bridge A/HMWB GB106039022960 Thames (Waterhaybridge to Not Designated Moderate Moderate High High Moderate High Moderate High Good High Cricklade) and Chelworth A/HMWB Brook GB106039022990 Thames Not Designated Moderate Moderate High High High Poor High (Churn to Coln) A/HMWB GB106039029992 Coln (from Coln Rogers) and Not Designated Moderate Moderate High Moderate High High High Good High Thames (Coln to Leach) A/HMWB GB106039029992 Thames (Leach to Evenlode) Not Designated Poor Poor Poor Poor High High High Moderate High A/HMWB GB106039030334 Thames (Evenlode to Thame) Not Designated Moderate Moderate Moderate Moderate High High Poor Moderate High A/HMWB GB106039030331 Thames Wallingford to Heavily Modified Moderate Moderate Moderate High High High Poor High Caversham (Flood, Navigation) GB106039023233 Thames (Reading to Cookham) Heavily Modified (Flood, Moderate Moderate High High High High Moderate High Nav, Water storage) GB106039023231 Thames (Cookham to Egham) Heavily Modified Moderate Moderate High High High High Moderate High (Flood, Nav, Water) GB106039023232 Thames (Egham to Heavily Modified Poor Poor Good Poor High High High Moderate High Teddington) (Flood, Nav, Water)

Severn Thames Transfer Water quality and ecology assessment Phase 2 WFD: RBMP2 (2014) Waterbodies – Interim status From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Baseline Ecological Descriptions and Risk Characterisation From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Requirements of Ecology Assessments • Characterisation of ecological conditions in River Severn and River Thames. Variant specific assessment of: • Ecological consequence of when, how often and for how long transfer may operate. • level of ecological sensitivity based on transfer triggers. • What could River Severn flow and water quality change mean to ecology? • What could River Thames flow and water quality change mean to ecology? From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Ecology - Fisheries From policy to practice

Severn Thames Transfer Water quality and ecology assessment Phase 2 Fish Assessment Methodology Preliminary risk characterisation exercise for each option considering aspects specific to current fish assemblage including: • Rare and notable species • Fish genetics (i.e. effects on genetically distinct populations of fish) • Fish parasites/disease • Invasive non-native species (INNS) • Fish migration • Habitats i.e. spawning and nursery habitat • Eel regulations and Eel Management Plans • WFD deterioration From policy to practice