The Threat to Portsmouth Harbour
The Threat to Portsmouth Harbour by Christopher Donnithorne © CHD Dec 2020 Contents Executive Summary iii Introduction 1 Historical Overview Inside the Harbour - Reclamation 3 Inside the Harbour - Dredging 5 Haslar Lake 11 Harbour Approaches 17 Blockhouse Wall 21 Selected Current Issues Portsmouth Harbour - General 29 Hamilton Bank & the Main Channel 31 Blockhouse - Moat Wall 33 - Old Sea Wall 37 - Sheet Piling - Brief Notes 41 - Sales Potential 43 Inside the Harbour 45 Conclusions 49 Solutions 53 i Illustrations: Except as listed below, all images are either the author’s copyright, or out of copyright material currently held within the author’s collection. I am grateful for permission to publish, as follows: Figures 8, 9, 14, 16, 38 The National Archives (TNA), with permission. 11, 18, 22, 24, 25, 27, 44, 52, 53 Ministry of Defence (MoD), Crown Copyright, all pre 1990. 21 MoD, Admiralty Library, with permission. 26, 28 Source and copyright currently untraced. 32, 33, 36 UK Hydrographic Office (UKHO), with permission. 34 Imray, Laurie, Norie & Wilson Ltd, with permission. 35 Royal Haskoning DHV (RHD), permission sought. 40, 43 Courtesy of the photographer AM, identity withheld. Additionally, the combination of figures 33-35 in this format is claimed as copyright by the author, © CHD. Within the timescale available, every reasonable effort has been made to identify the source or copyright of the images used. I apologise if I have missed something obvious. ii Executive Summary The harbour has always depended on the scouring effect of the strong ebb tide, itself reliant on the presence of Blockhouse Point, which physically consists of a deep bank of sand and shingle, topped by the Fort itself.
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