Lichfield Canal Water Supply Study – Stage B Lichfield Canal Water Supply Study – Stage B Prepared for WCL Quarries Ltd Quarries House 2 Cobbett Road Burntwood Staffordshire WS7 3GL Report reference: 63918R2, July 2016 Report status: Final Confidential Prepared by ESI Ltd New Zealand House,160 Abbey Foregate, Shrewsbury, SY2 6FD, UK Tel +44(0)1743 276100 Fax +44 (0)1743 248600 email [email protected] Registered office: New Zealand House, 160 Abbey Foregate, Shrewsbury, SY2 6FD. Registered in England and Wales, number 3212832 Lichfield Canal Water Supply Study – Stage B This report has been prepared by ESI Ltd. (ESI) in its professional capacity as soil and groundwater specialists, with reasonable skill, care and diligence within the agreed scope and terms of contract and taking account of the manpower and resources devoted to it by agreement with its client, and is provided by ESI solely for the internal use of its client. In respect of this report the financing client is WCL. The client / user group for this report is The Lichfield and Hatherton Canal Restoration Trust (LHCRT). The advice and opinions in this report should be read and relied on only in the context of the report as a whole, taking account of the terms of reference agreed with the client. The findings are based on the information made available to ESI at the date of the report (and will have been assumed to be correct) and on current UK standards, codes, technology and practices as at that time. They do not purport to include any manner of legal advice or opinion. New information or changes in conditions and regulatory requirements may occur in future, which will change the conclusions presented here. This report is confidential to the client. The client in this instance is as above i.e. WCL and LHCRT. The client may submit the report to regulatory bodies, where appropriate. Should the client wish to release this report to any other third party for that party’s reliance, ESI may, by prior written agreement, agree to such release, provided that it is acknowledged that ESI accepts no responsibility of any nature to any third party to whom this report or any part thereof is made known. ESI accepts no responsibility for any loss or damage incurred as a result, and the third party does not acquire any rights whatsoever, contractual or otherwise, against ESI except as expressly agreed with ESI in writing. Confidential Prepared by ESI Ltd New Zealand House,160 Abbey Foregate, Shrewsbury, SY2 6FD, UK Tel +44(0)1743 276100 Fax +44 (0)1743 248600 email [email protected] Registered office: New Zealand House, 160 Abbey Foregate, Shrewsbury, SY2 6FD. Registered in England and Wales, number 3212832 63918R2. Final Name Signature Jennifer Bassford, Bob Author Sargent, Antonio Gennarini Checked by Antonio Gennarini Reviewed by Mike Streetly Revision record: Issue Report ref Comment Author Checker Reviewer Issue date Issued to Robin Initial draft for client 1 63918R2D1 ARG/JAB ARG MJS 30/11/2015 Smithyman; review Derek Lord Robin ARG/JAB 2 63918R2 Final report ARG MJS 05/02/2016 Smithyman; /BS Derek Lord Robin 63918R2 ARG/JAB 3 Final report ARG MJS 11/07/2016 Smithyman; rev1 /BS Derek Lord 4 Confidential Prepared by ESI Ltd New Zealand House,160 Abbey Foregate, Shrewsbury, SY2 6FD, UK Tel +44(0)1743 276100 Fax +44 (0)1743 248600 email [email protected] Registered office: New Zealand House, 160 Abbey Foregate, Shrewsbury, SY2 6FD. Registered in England and Wales, number 3212832 Lichfield Canal Water Supply Study – Stage B Page i CONTENTS 1 INTRODUCTION ....................................................................................................... 1 1.1 Background ............................................................................................................... 1 1.2 Objective and Scope ................................................................................................. 1 1.3 Previous Reports ...................................................................................................... 2 1.3.1 Sharkey Associates .............................................................................................. 2 1.3.2 Atkins .................................................................................................................... 2 1.3.3 PSL ....................................................................................................................... 2 1.3.4 ESI ........................................................................................................................ 2 1.4 This Report ............................................................................................................... 2 2 LICHFIELD CANAL ................................................................................................... 5 2.1 Background to the Proposed Restoration ................................................................. 5 2.2 History of the Canal................................................................................................... 5 2.3 Current State ............................................................................................................. 5 3 PHYSICAL SETTING ................................................................................................ 6 3.1 Geology ..................................................................................................................... 6 3.2 Hydrology .................................................................................................................. 9 3.3 Hydrogeology ............................................................................................................ 9 3.3.1 Aquifer units and properties .................................................................................. 9 3.3.2 Groundwater levels ............................................................................................... 9 3.4 Anthropogenic Influences........................................................................................ 13 3.4.1 Abstractions ........................................................................................................ 13 3.4.2 Discharges .......................................................................................................... 17 3.4.3 Quarries .............................................................................................................. 19 3.4.4 Mining ................................................................................................................. 20 4 WATER SUPPLY DEMAND (WSD) ASSESSMENT .............................................. 22 4.1 Assessment Approach and Model Development .................................................... 22 4.2 Full restoration ........................................................................................................ 22 4.2.1 Initial Fill Volumes ............................................................................................... 22 4.2.2 Water Losses ...................................................................................................... 23 4.2.3 Lockage .............................................................................................................. 24 4.3 Impact of Full Restoration on the Existing CRT Network ........................................ 26 4.3.1 Additional demand on the wider CRT network as a result of restoration ............ 26 4.4 Summary of Potential Water Demand ..................................................................... 28 Report Reference: 63918R2 rev1 Report Status: Final Lichfield Canal Water Supply Study – Stage B Page ii 5 WATER SUPPLY SOURCE (WSS) ASSESSMENT .............................................. 30 5.1 Availability of Water................................................................................................. 30 5.2 Assessment Approach ............................................................................................ 30 5.3 Unconstrained List of Potential Water Sources for the Canal ................................. 30 5.3.1 New surface water abstractions .......................................................................... 30 5.3.2 Licence Trading .................................................................................................. 31 5.3.3 Groundwater ....................................................................................................... 31 5.3.4 Surface Water from Residential Development .................................................... 34 5.3.5 Existing Highway Drains and Public Surface Water Sewers .............................. 35 5.3.6 LHCRT Licensed Abstraction .............................................................................. 39 5.3.7 Backpumping ...................................................................................................... 39 5.3.8 Burntwood STW .................................................................................................. 39 5.3.9 Marina at Cranebrook Quarry ............................................................................. 39 5.3.10 CRT, Birmingham Canal Navigation ................................................................... 39 5.3.11 Summary of the Unconstrained list of Potential Water Sources for the Canal .... 40 5.4 Constrained list of Supply Options for Full Restoration ........................................... 45 5.5 Water Source Reliability and Uncertainties ............................................................. 46 6