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West Herts College Deculverting Proposals

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West Herts College Deculverting Proposals West Herts College Deculverting Proposals Environment Agency Response 133834-EAR-(0) DECEMBER 2020 RSK GENERAL NOTES Project No.: 133834 Title: West Herts College Deculverting Proposals Client: Bellway Homes Ltd. (North London) Date: 7th December 2020 Office: Hemel Hempstead Status: Final (For Planning Purposes Only) Author G Turner Technical reviewer C Ariyaratne Date: 4th December 2020 Date: 7th December 2020 Project manager C Ariyaratne Date: 7th December 2020 Revision Comments Author Technical Reviewer 0 1st issue GT CA RSK Land and Development Engineering Ltd (RSK) has prepared this report for the sole use of the client, showing reasonable skill and care, for the intended purposes as stated in the agreement under which this work was completed. The report may not be relied upon by any other party without the express agreement of the client and RSK. No other warranty, expressed or implied, is made as to the professional advice included in this report. Where any data supplied by the client or from other sources have been used, it has been assumed that the information is correct. No responsibility can be accepted by RSK for inaccuracies in the data supplied by any other party. The conclusions and recommendations in this report are based on the assumption that all relevant information has been supplied by those bodies from whom it was requested. No part of this report may be copied or duplicated without the express permission of RSK and the party for whom it was prepared. Where field investigations have been carried out, these have been restricted to a level of detail required to achieve the stated objectives of the work. This work has been undertaken in accordance with the quality management system of RSK Land and Development Engineering Ltd. Bellway Homes (North London) Environment Agency Response 133834-EAR-(0) CONTENTS Contents 1 INTRODUCTION .............................................................................................................................. 1 1.1 Purpose of this report ............................................................................................................... 1 1.2 Development Proposals ........................................................................................................... 1 1.2.1 Main Site ....................................................................................................................... 1 1.2.2 Deculverting and Formation of Naturalized Channel ................................................... 1 2 PLANNING HISTORY ...................................................................................................................... 2 2.1 General ..................................................................................................................................... 2 2.2 Planning Application ................................................................................................................. 2 2.3 EA Consultation ........................................................................................................................ 3 3 CONSTRAINTS AFFECTING THE DECULVERTING PROPOSALS ............................................ 4 3.1 General ..................................................................................................................................... 4 3.2 Existing Site Conditions ............................................................................................................ 4 3.2.1 Boundary Conditions .................................................................................................... 4 3.2.2 Existing Culvert ............................................................................................................. 6 3.2.3 Site Levels .................................................................................................................... 7 3.2.4 Flows to be Catered For ............................................................................................... 8 3.3 Planning Requirements ............................................................................................................ 8 3.3.1 Amenity Space ............................................................................................................. 9 3.3.2 Parking ......................................................................................................................... 9 3.3.3 Access requirements .................................................................................................. 10 3.3.4 Maintenance Access .................................................................................................. 10 3.4 EA Objections ......................................................................................................................... 10 4 CHANNEL GEOMETRY ................................................................................................................ 12 4.1 EA Objection ........................................................................................................................... 12 4.2 Designer’s Response ............................................................................................................. 12 4.2.1 General ....................................................................................................................... 12 4.2.2 Constraints Specific to the Open Channel Geometry ................................................ 12 4.2.3 Edge Treatment .......................................................................................................... 14 4.2.4 Bed Level .................................................................................................................... 17 4.2.5 Gabions ...................................................................................................................... 19 5 CHANNEL LINING ......................................................................................................................... 21 5.1 EA Objection ........................................................................................................................... 21 5.2 Designer’s Response ............................................................................................................. 21 5.2.1 Channel Liner ............................................................................................................. 21 5.2.2 Gravels to Base of Open Channel .............................................................................. 21 6 ENERGY DISSIPATION STRUCTURE ......................................................................................... 23 6.1 EA Objection ........................................................................................................................... 23 6.2 Designer’s Response ............................................................................................................. 23 6.2.1 Requirement for This Structure .................................................................................. 23 6.2.2 Fish Passage .............................................................................................................. 24 7 HEADWALL ................................................................................................................................... 25 Bellway Homes (North London) Drainage Strategy Statement 133834-DSS-(02) 7.1 EA Objection ........................................................................................................................... 25 7.2 Designer’s Response ............................................................................................................. 25 8 FLOOD RISK .................................................................................................................................. 27 8.1 EA Comments Following the Meeting on 26th November 2020 ............................................. 27 8.2 Designer’s Response ............................................................................................................. 27 9 DESIGN CONCLUSION ................................................................................................................. 29 9.1 Original Open Channel Proposal Objected to by EA ............................................................ 29 9.2 Revised Open Channel Proposal Amended in Line with EA Comments ............................... 29 APPENDIX A – EA CORRESPONDENCE .......................................................................................... 30 APPENDIX B – SITE CONSTRAINTS ................................................................................................. 31 APPENDIX C - SCHEME PROPOSALS .............................................................................................. 32 APPENDIX D – HYDRAULIC CALCULATIONS ................................................................................. 33 APPENDIX E – FLOOD RISK TECHNICAL NOTE ............................................................................. 34 Bellway Homes (North London) Drainage Strategy Statement 133834-DSS-(02) 1 INTRODUCTION 1.1 Purpose of this report This report has been prepared to provide a formal response to the objection raised by Environment Agency (EA) in relation to the deculverting proposals associated with the former West Herts College, Home Park Mill Link Road, Kings Langley. For the purposes of this report this development will simply be referred to as the, “Site”. 1.2 Development Proposals 1.2.1 Main Site Bellway Homes
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