Manchester Ship Canal: Summary of Known Data and Relevant Information Final Report Appendix Document United Utilities 413687 February 2015 Dr Keith Hendry, Heather Webb, Dr Michael Dobson, Caitlin Riddick Client: United Utilities Address: Lingley Mere Business Park Lingley Green Avenue Great Sankey Warrington WA5 3LP Project reference: 413687 Date of issue: February 10, 2015 ________________________ Project Director: Dr Keith Hendry Project Manager: Heather Webb ________________________ APEM Ltd Riverview A17 Embankment Business Park Heaton Mersey Stockport SK4 3GN Tel: 0161 442 8938 Fax: 0161 432 6083 Registered in England No. 2530851 Report should be cited as: “APEM (2014). Manchester Ship Canal: Summary of Known Data and Relevant Information. Appendix Document. United Utilities, February 2015 Final” Report Note: This is a technical report only. It does not consider or make any statements in relation to legal liability or legal responsibilities. Any statements on allocation or source apportionment are purely factual following the approach set out Appendix IV of this report. Revision and Amendment Register Version Date Section(s) Page(s) Summary of Changes Approved Number by Preparation of draft report for V01 09/01/2015 All All HW client submission Preparation of final report for All All HW V02 11/02/2015 client submission Contents Appendix I Data Availability and Previous Water Quality Reports............................................ 1 AI.1 Data Availability ............................................................................................................ 1 AI.2 Background to Previous Reports Reviewing the Water Quality of the MSC .................. 9 Appendix II Review of Historic MSC Water Quality Data ....................................................... 11 AII.1 Dissolved Oxygen (DO) ........................................................................................ 11 AII.2 BOD ...................................................................................................................... 19 AII.3 Ammonia............................................................................................................... 32 AII.4 Nutrients (Phosphorus) ......................................................................................... 37 AII.5 Sediment Oxygen Demand (SOD) ........................................................................ 38 AII.6 Sediments ............................................................................................................. 40 Appendix III Algal Blooms ..................................................................................................... 43 Appendix IV Source Apportionment for Factors Influencing Water Quality ............................ 47 AIV.1 Method .................................................................................................................. 47 AIV.2 Results .................................................................................................................. 53 AIV.3 Discussion ............................................................................................................ 59 Appendix V Flood Risk .......................................................................................................... 60 AV.1 Introduction ............................................................................................................... 60 AV.2 Sources of Flooding .................................................................................................. 60 AV.3 Flood Risk Results .................................................................................................... 62 AV.4 Conclusion ................................................................................................................ 66 List of Figures Figure AI 1 APEM and EA Sampling Sites for BOD and Ammonia - Pound 1 ......................... 5 Figure AI 2 APEM and EA Sampling Sites for BOD and Ammonia - Pound 2 ......................... 6 Figure AI 3 APEM and EA Sampling Sites for BOD and Ammonia - Pound 3 ......................... 7 Figure AI 4 APEM and EA Sampling Sites for BOD and Ammonia - Pound 4 ......................... 8 Figure AII 1 Mean annual surface DO (mg/l) in the MSC Pounds. TB = Turning Basin. ........ 12 Figure AII 2 Minimum surface DO (mg/l) recorded each year in the MSC Pounds TB = Turning Basin. ....................................................................................................................... 12 Figure AII 3 Mean annual bottom water DO (mg/l) in the MSC Pounds. TB = Turning Basin. 13 Figure AII 4 Minimum bottom water DO (mg/l) recorded each year in the MSC Pounds. TB = Turning Basin. ....................................................................................................................... 13 Figure AII 5 Bottom water DO concentrations in the Turning Basin, 3rd June 2013 ................ 14 Figure AII 6 Bottom water DO concentrations in the Turning Basin, 8th July 2013 ................. 14 Figure AII 7 DO at the EA Sonde at Barton, 2014. ................................................................ 15 Figure AII 8 DO at the EA Sonde at Irlam, 2014. ................................................................... 16 Figure AII 9 DO at the EA Sonde at Caddishead, 2014. ........................................................ 16 Figure AII 10 Diurnal variations in dissolved oxygen (%) from the EA continuous monitoring sonde at Barton, 17th to 18th March 2014............................................................................... 17 Figure AII 11 Diurnal variations in dissolved oxygen (%) from the EA continuous monitoring sonde at at Irlam, 25th May 2014. .......................................................................................... 17 Figure AII 12 Diurnal variations in dissolved oxygen (%) from the EA continuous monitoring sondes between the 13th and 19th of May 2006. .................................................................... 18 Figure AII 13 Diurnal variations in dissolved oxygen (%) from the EA continuous monitoring sondes between the 29th June and 5th of July 2006. ............................................................ 18 Figure AII 14 Diurnal variations in dissolved oxygen (%) from the EA continuous monitoring sondes between the 8th and 13th August 2006. ...................................................................... 19 Figure AII 15 Mean annual and maximum BOD within the MSC Turning Basin. .................... 20 Figure AII 16 Mean annual and maximum BOD within the MSC Turning Basin and upstream to Woden Street. ................................................................................................................... 21 Figure AII 17 Mean annual and maximum BOD within the MSC Turning Basin and upstream to Woden Street during oxygenation/aeration. ...................................................................... 21 Figure AII 18 Maximum BOD concentrations on tributaries into Pound 1. ............................. 22 Figure AII 19 Mean annual and maximum BOD between Mode Wheel and Barton Locks. .... 23 Figure AII 20 Maximum annual BOD sites between Mode Wheel and Barton Locks. Sites upstream of Salford WwTW denoted by dashed lines. .......................................................... 24 Figure AII 21 Mean annual and maximum BOD between Barton and Irlam Locks (EA data). 25 Figure AII 22 Maximum annual BOD sites between Barton and Irlam Locks. ........................ 25 Figure AII 23 Mean annual and maximum BOD between Irlam and Latchford Locks. ........... 26 Figure AII 24 Maximum BOD between up- and downstream of Irlam Locks. ......................... 27 Figure AII 25 Maximum BOD concentrations at EA sites within Pound 4............................... 28 Figure AII 26 Maximum BOD concentrations in the River Mersey and MSC sites up- and downstream of the Mersey confluence .................................................................................. 29 Figure AII 27 Maximum BOD concentrations in the River Glaze and Red Brook compared to the MSC. ............................................................................................................................... 30 Figure AII 28 Maximum BOD concentrations in the River Bollin compared to the MSC. ........ 31 Figure AII 29 Maximum BOD concentrations in the River Mersey compared to the MSC. ..... 31 Figure AII 30 Mean, minimum and maximum ammonia concentrations within Pound 1 ......... 32 Figure AII 31 Mean, minimum and maximum ammonia concentrations within Pound 2 ......... 33 Figure AII 32 Maximum ammonia concentrations .................................................................. 34 Figure AII 33 Mean, minimum and maximum ammonia concentrations within Pound 3 ......... 35 Figure AII 34 Mean, minimum and maximum ammonia concentrations in the MSC within Pound 4 ................................................................................................................................ 36 Figure AII 35 Maximum ammonia concentrations within Pound 4 ......................................... 37 Figure AII 36 Mean annual total phosphorus concentrations within the MSC ........................ 38 Figure AII 37 SOD measurements from the Turning Basin and MSC. Data labelled as MSC are just denoted as MSC in the relevant source reports. ....................................................... 39 Figure AII 38 SOD measured throughout the MSC Pounds in 2007 ...................................... 39 Figure AII 39 SOD