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Technical Assessment Report to Support Section 19 Flood Investigation

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Technical Assessment Report to Support Section 19 Flood Investigation Technical Assessment Report to support Section 19 Flood Investigation Long Marston, Hertfordshire Client: Hertfordshire County Council Prepared by: McCloy Consulting Ltd September 2014 52 Mallusk Enterprise Park, Newtownabbey, Northern Ireland BT36 4GN T: +44 28 9084 8694 E: [email protected] W: www.mccloyconsulting.com MCL250-04 REVISION HISTORY Document Reference: MCL250-04 DG01 Revision Date of Reason for Issue Amendments Issued to Reference Issue DRAFT FOR INFORMATION / HERTFORDSHIRE COUNTY 1 20/06/2014 ORIGINAL COMMENT COUNCIL ISSUED FOR INFORMATION & MINOR AMENDMENTS PER HCC HERTFORDSHIRE COUNTY 2 26/06/2014 STAKEHOLDER CONSULTATION COMMENTS COUNCIL MINOR COMMENTS ADDED THROUGHOUT UPDATED FOLLOWING REVIEW SECTION 5.2 EXPANDED TO INCLUDE CRT HERTFORDSHIRE COUNTY 3 23/09/2014 BY PARISH COUNCIL & CRT INFO. COUNCIL APPENDIX A & D MODIFIED REMOVAL OF SPECIFIC ADDRESSES AND HERTFORDSHIRE COUNTY 4 25/09/2014 MINOR AMENDMENTS MINOR CHANGES COUNCIL CONTRACT This report describes work commissioned by Hertfordshire County Council following written instruction by their representative dated 13/05/2014. Prepared by: Paul Singleton Environmental Engineer MSc BEng (Hons) MIEI Reviewed by: Kyle Somerville Chartered Engineer BEng (Hons) CEng MIEI Approved by: Anthony McCloy Director BEng CEng FIEI Date: 25 September 2014 DISCLAIMER This document has been prepared solely as a Technical Assessment Report to support Section 19 Flood Investigation for Hertfordshire County Council. McCloy Consulting Ltd accepts no responsibility or liability for any use that is made of this document other than by Hertfordshire County Council for the purposes for which it was originally commissioned and prepared. Technical Assessment Report to support Section 19 Flood Investigation i September 2014 Long Marston, Hertfordshire MCL250-04 CONTENTS GLOSSARY OF TERMS .................................................................................................................................................................1 EXECUTIVE SUMMARY .................................................................................................................................................................3 1 INTRODUCTION .......................................................................................................................................................................4 1.1 TERMS OF REFERENCE .......................................................................................................................................................4 1.2 STATEMENT OF AUTHORITY .................................................................................................................................................4 1.3 APPROACH TO THE ASSESSMENT ........................................................................................................................................4 2 SITE INFORMATION .................................................................................................................................................................6 2.1 SITE DETAILS .....................................................................................................................................................................6 2.2 SITE DESCRIPTION & GEOGRAPHICAL SCOPE .......................................................................................................................7 2.3 AFFECTING WATERCOURSES ...............................................................................................................................................7 3 BACKGROUND INFORMATION REVIEW ...............................................................................................................................9 3.1 INTERNET / MEDIA / SEARCH ...............................................................................................................................................9 3.2 RELEVANT STAKEHOLDERS .................................................................................................................................................9 3.2.1 Hertfordshire County Council – Lead Local Flood Authority .......................................................................................9 3.2.2 Hertfordshire County Council – Highway Authority .....................................................................................................9 3.2.3 Long Marston, Wilstone, Puttenham and Astrope website .........................................................................................9 3.2.4 Local Residents .........................................................................................................................................................10 3.2.5 Hertfordshire Fire & Rescue Service .........................................................................................................................10 3.2.6 Tring Rural Parish Council ........................................................................................................................................10 3.2.7 Canal and River Trust ...............................................................................................................................................11 3.3 ENVIRONMENT AGENCY ....................................................................................................................................................11 3.3.1 EA Flood Maps ..........................................................................................................................................................11 3.3.2 CCTV Culvert Survey ................................................................................................................................................12 3.3.3 EA Maintenance Regime ..........................................................................................................................................13 3.4 STRATEGIC FLOOD RISK ASSESSMENT ..............................................................................................................................14 3.5 SEWERAGE INFRASTRUCTURE ...........................................................................................................................................14 3.6 BRITISH GEOLOGICAL SURVEY ..........................................................................................................................................15 3.6.1 Geology .....................................................................................................................................................................15 3.6.2 Groundwater .............................................................................................................................................................15 4 HISTORICAL FLOOD EVENTS ..............................................................................................................................................16 4.1 INTRODUCTION .................................................................................................................................................................16 4.2 RECORDED FLOOD EVENTS ..............................................................................................................................................16 4.2.1 Hertfordshire County Council Highways Reports ......................................................................................................17 4.3 RECORDED FLOOD LOCATIONS .........................................................................................................................................17 5 FLOOD MECHANISMS ...........................................................................................................................................................19 5.1 FLUVIAL & SURFACE WATER FLOODING .............................................................................................................................19 5.1.1 Site Topography ........................................................................................................................................................19 5.1.2 Fluvial (River) Catchment ..........................................................................................................................................19 5.1.3 Surface Water (Pluvial) Catchment & Highway Drainage .........................................................................................20 5.1.4 Soil Properties ...........................................................................................................................................................21 5.1.5 Rainfall ......................................................................................................................................................................22 5.1.6 Analysis .....................................................................................................................................................................23 5.1.7 Fluvial / Surface Water Summary .............................................................................................................................26 5.2 TRING RESERVOIRS AND CANAL INFRASTRUCTURE .............................................................................................................26 5.2.1 Canal and Reservoir Operation .................................................................................................................................26 5.3 TRING BOURNE CULVERTS ................................................................................................................................................31
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