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Communications Team Lyme Regis Environmental Improvements SCOPAC Visit 12 June 2013 Undermining & Foreshore Lowering Wave Attack Reactivation of Coastal Landslides Lyme Regis: Proximity of Black Ven 93000 94100 91800 333500 334500 332500 Lyme Regis Environmental Improvements: The Spittles Phase III Monmouth Beach Black Ven and Ware Cliffs Phase V Phase II Phase I Phase IV The Cobb Cobb Gate to Cobb Gate to East Cliff Harbour Church Cliff (2007) (1995) Lyme Regis Environmental Improvements Phase 1 – Cobb Gate to Church Cliff Completed in 1995 at a cost of £10m Funded by the Ministry of Agriculture, Fisheries and Food (MAFF), South West Water and West Dorset District Council - New sea walls protecting the town centre - Extensive sewerage improvements - Storm tanks within sea walls to hold polluted rainwater - Sewage pumping station, sewage treatment and sea outfall LREI: Phase 1 – Cobb Gate to Church Cliff Construction of the new pumping station LREI: Phase 1 – Cobb Gate to Church Cliff The completed scheme LREI: Phase 1 – Cobb Gate to Church Cliff Before Phase 1 After Phase 1 Lyme Regis Environmental Improvements Phase 2 – Cobb Gate to Harbour Completed 2007 at a cost of £26m Funded by Defra grant, Dorset County Council and West Dorset District Council - Replacement and extension of Beacon Rocks - New sea walls, extending the Cart Road - Beach Replenishment to protect the town frontage - Stabilisation of coastal slopes along the town frontage - Stabilisation and improvement of Cobb Road Lyme Regis Environmental Improvements Phase 2 – Cobb Gate to Harbour Reinforced Soil Slope Buttresses Slope Re-grading Soil Nails Horizontal Piles Drains Counterfort & Trench Drains Plus extensive drainage improvements Piles HR Wallingford - physical model used to test scheme options 1:50 scale physical model in a 50m x 35m wave basin Lyme Regis Environmental Improvements Phase 2 – Cobb Gate to Harbour LREI: Phase 2 – Cobb Gate to Harbour Beacon Rocks Extension Sand and Shingle Supply: Phase II 400 ton capacity side tipping vessels 70,000 tonnes total LREI: Phase 2 – Cobb Gate to Harbour Foreshore Protection 137 pre-cast 3m³ - 4m³ concrete blocks provides 274m of foreshore protection Foreshore Protection : Phase II Wave return wall PE STABILISATION – UNTRFORT DRAINS AND ENGINEERED FILL: PHASE II LREI: Phase 2 Slope Stabilisation Installation of CHS reinforcement LREI: Phase 2 Retaining Structures & Soil Nailing Crib walls Retaining walls Total length: 520m LREI: Phase 2 Completed Rockery & Beacon Rocks LREI: Phase 2 Extensive Landscape Works LREI: Phase 2 Completed Beaches and Promenade LREI Phase III Monmouth Beach & Ware Cliff - Stabilisation of West Cliff - Reshaping of Monmouth Beach Found not to be economically justified and environmentally unacceptable. The viable elements of Phase III, stabilising developed areas west of Cobb Road, were included in Phase II. LREI Urgent Advance Works 2004 LREI Urgent Advance Works 2004 Large diameter 750mm & 1050mm pile construction LREI Phase IV East Cliff The aim is to stop the progress of the major Spittles/Black Venn landslip systems into the eastern side of the town. Without the scheme, approximately 240 houses/flats and 900m of the main road into the town would be lost over the next 50 years Funding: • Defra/Environment Agency grant • Dorset County Council • West Dorset District Council Lyme Regis Environmental Improvements Phase 4 – East Cliff Scheme: - 390m of new sea wall supporting the old, failing sea wall to the east of the town - Extensive slope stabilisation works including piling, soil nailing and deep drainage Lyme Regis Environmental Improvements: Phase IV – Area of Stabilisation Lyme Regis Environmental Improvements Phase 4 – East Cliff 40% Landslide Recession Scenario Outcome Zones 60% 85% “DO NOTHING” CASE Chance of occurrence of the 85% complete loss of the outcome zones in 20 years 95% 70% 95% 90% 90% 90% 80% Statutory and other Environmental Designations Heritage Coast SAC SSSI & WHS Conservation Area Listed Buildings NB Whole area is in the Dorset AONB Lyme Regis Environmental Improvements Phase 4: Proposed Solution Lyme Regis Environmental Improvements Phase 4: Proposed Solution LREI Phase IV - CURRENT POSITION • Conditional Planning consent - April 2010 • Statutory consultations - completed July 2010 • Approval and funding application to EA - April 2010 • EA Technical approval - February 2011 • Supervising Consultant bids - July 2011 – Halcrow • Main Contract Tender (design & build) - March 2012 • EA full (financial) scheme approval - March 2012 • Main Contractor Appointed - April 2012 – Dean & Dyball/URS LREI Phase V The Cobb As well as being a historic, grade 1 listed harbour, the Cobb is fundamental to the town’s coast defences. Extensive investigation has been carried out: - Crack and inclinometer monitoring - Testing and assessment of existing sheet piles - Borescope and ground penetrating radar - Trial excavations and core drilling - Structural Inspections The possibility is being investigated of entering a Heritage Partnership Agreement with English Heritage, covering short term maintenance and longer term proposals for strengthening and restoration. Lyme Regis Environmental Improvements Phase 5 – The Cobb .
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