West Northamptonshire Water Cycle Study Pre-Submission Joint Core
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West Northamptonshire water cycle study – Pre-Submission Joint Core Strategy final detailed WCS report West Northamptonshire Water Cycle Study Pre-Submission Joint Core Strategy Detailed WCS Final report September 2011 1 Ref WUNNDC011 September 2011 West Northamptonshire water cycle study: Pre-Submission Joint Core Strategy final detailed WCS report West Northamptonshire Water Cycle Study Pre-Submission Joint Core Strategy Final detailed WCS report Halcrow Group Limited Burderop Park Swindon SN4 0QD 01793 812479 http://www.halcrow.com/html/our_markets/watercycleplanning.htm Halcrow Group Limited has prepared this report in accordance with the instructions of their client for their sole and specific use. Any other persons who use any information contained herein do so at their own risk. © Halcrow Group Limited 2011 Ref WUNNDC011 September 2011 2 2 West Northamptonshire water cycle study – Pre-Submission Joint Core Strategy final detailed WCS report West Northamptonshire water cycle study Pre-Submission Joint Core Strategy detailed WCS report Revision schedule: Date Document Stage Author reference 23/05/2010 WUNNDC007 Confidential draft report ADM for steering group consultation only 29/07/2010 WUNNDC008 Confidential draft final ADM report for steering group consultation only 11/01/2011 WUNNDC009 Confidential final report ADM (as amended with RSS addendum) for steering group consultation only 15/04/2011 WUNNDC010 Draft final detailed WCS ADM report for consultation 20/06/2011 WUNNDC011 Final detailed WCS report ADM for signoff. 17/08/2011 WUNNDC012 Final detailed WCS report ADM v2 for signoff. 30/09/2011 WUNNDC013 Final detailed WCS report ADM v3. 3 Ref WUNNDC011 September 2011 West Northamptonshire water cycle study: Pre-Submission Joint Core Strategy final detailed WCS report CONTENTS 1 Introduction........................................................................................................................................... 7 1.1 Background............................................................................................................................................................................... 7 2 Growth and development..................................................................................................................... 8 2.1 Water cycle processes .......................................................................................................................................................... 8 2.2 Sustainable growth.................................................................................................................................................................. 8 2.3 The current spatial distribution........................................................................................................................................... 9 2.4 Development policy context..............................................................................................................................................10 2.5 Distribution and phasing of development.......................................................................................................................10 2.6 Environmental considerations ...........................................................................................................................................14 2.7 The Water Framework Directive ....................................................................................................................................15 2.8 River Basin Management Plans ..........................................................................................................................................17 3 Water quality environmental capacity assessment.......................................................................... 26 3.1 Introduction............................................................................................................................................................................26 3.2 Data and References............................................................................................................................................................26 3.3 Methodology ..........................................................................................................................................................................27 3.4 Northampton water quality assessment.........................................................................................................................27 3.5 Brackley water quality assessment ...................................................................................................................................30 3.6 Towcester water quality assessment...............................................................................................................................33 3.7 Daventry water quality assessment..................................................................................................................................36 3.8 Water quality environmental capacity summary ..........................................................................................................39 4 Water resources and water supply.................................................................................................... 43 4.1 Introduction............................................................................................................................................................................43 4.2 Environment Agency Water Resource Management ..................................................................................................44 4.3 CAMS Review ........................................................................................................................................................................46 4.4 Water Company Planning...................................................................................................................................................49 4.5 Current Water Resources .................................................................................................................................................50 4.6 Water Efficiency Targets.....................................................................................................................................................54 4.7 Anglian Water Resource Strategy ....................................................................................................................................56 4.8 Future Water Demand Scenario Testing........................................................................................................................60 Ref WUNNDC011 September 2011 4 4 West Northamptonshire water cycle study – Pre-Submission Joint Core Strategy final detailed WCS report 4.9 Drivers and Constraints......................................................................................................................................................65 4.10 Water Resources Summary ...............................................................................................................................................65 5 Flood risk management...................................................................................................................... 67 5.1 Introduction............................................................................................................................................................................67 5.2 Northampton town catchment review ...........................................................................................................................72 5.3 Daventry..................................................................................................................................................................................80 5.4 South Northamptonshire....................................................................................................................................................84 6 Groundwater and Sustainable Drainage Systems ............................................................................ 92 6.1 Introduction............................................................................................................................................................................92 6.2 Geological and Hydrogeological Setting..........................................................................................................................92 6.3 SuDS for the West Northamptonshire Area ................................................................................................................92 6.4 Sustainable Drainage and Planning....................................................................................................................................92 6.5 Suitability of infiltration or attenuation system .............................................................................................................96 6.6 SuDS design: Daventry ........................................................................................................................................................99 6.7 SuDS design: South Northamptonshire ........................................................................................................................100 7 Water services infrastructure capacity ........................................................................................... 104 7.1 Introduction..........................................................................................................................................................................104