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Dorset Coastal Forum Holes Bay FCERM Projects

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Dorset Coastal Forum Holes Bay FCERM Projects Dorset Coastal Forum Holes Bay FCERM Projects 17th June 2021 BCPMatt Mission Hosey statement here Head of Flood and Coastal Erosion Risk Management Overview • Holes Bay Saltmarsh Regeneration feasibility study • Poole Bridge to Hunger Hill flood defence scheme • Creekmoor and Sterte flood defence schemes Holes Bay Saltmarsh Regeneration Pressure on natural habitat Copyright of Poole Harbour Commissioners Saltmarsh decline 1924-1981 • 62% Spartina die back during that epoch • Significant losses since 1981 • Increasing pressure with SLR and sediment loss Image courtesy of: A J Pearson and J M Pearson Continued saltmarsh loss without intervention • Estimated around > 140ha loss between 1924 and 2019 • How many years until the saltmarsh erodes completely, especially with sea level rise? 1924 – Pearson & Pearson 2019 – courtesy of CCO Saltmarsh Regeneration Feasibility • £60k Local Levy bid • Average 10,000m3 dredged from Cobbs Quay, and Davis Boatyard • Average 1,000m3 dredged from RNLI ad hoc (typically every 3-5yrs) • Two key areas of eroding saltmarsh in close proximity to dredging operations • Environmental designations (SSSI, SPA, RAMSAR) Desktop studies/site visits Case studies • Lymington • Levington • Wallasea • Brightlingsea Lessons learned Extraction / Deposition / Plant & Materials / Sediment Retention / Constraints / Success & Evidence / Licencing / Challenges Methods change with experience • Clearer understanding of risks and impacts • Empirical evidence for licence approvals Methods for beneficial re-use/ deposition Market research for suitable methods and indicative costs Methods for silt retention Preferred option • Cutter suction dredging • Natural sediment barriers • E.g. heather bales • Stakeholder Liaison • Marina dredge campaigns • Licencing / consents • Funding parties • Monitoring • Habitat introduction Poole Bridge to Hunger Hill Flood Defence Scheme Scheme extents & flood risk • Historic expectation of flood defences through planning constraints on new development • Incentives still not encouraging delivery (0% CIL) Landowner / Stakeholder Consultation July 2019 – Presentation to Landowners • Scheme project management / EA / BCP planners • Proposal for single scheme led by BCP • Very positive feedback • Recognition of contribution need • Local Levy bid for OBC (£310k) • WSP lead via BCP framework agreement • Integrated delivery to address regen potential 14 Key factors in OBC Flowroute Poor wall condition Existing Defences 230 properties at risk by 2120. 50% AEP event in 2120 15 Poole Bridge to Hunger Hill Flood Defences • Historically awaiting developer led flood defence measures (including 0% CIL) • 2018 – Council led progression of single scheme • OBC submission in Oct 2020 (after Sep Cabinet approval) – £12.5 million scheme – Benefit from June project appraisal rule changes – Significant impact on regeneration / development opportunity – Place making scheme • EA Large Projects Review Group (LPRG) mid Nov • Approved Jan 2021 • Detailed design / stakeholder consultation underway Poole Bridge to Hunger Hill Flood Defences • Flood risk mitigation to unlock development • Enables delivery of planning aspirations • Promenade • Café front culture • Connectivity • Complements Twin Sails / power station site developments • Integrates existing Poole Town Centre with Holes Bay • BCP to manage asset going forwards Creekmoor and Sterte tidal flood defences Creekmoor & Sterte - Open channels into Holes Bay • OBC options for tidal and combined solutions • Preferred options at this point in time for tidal defences • Obvious benefits for Surface Water attenuation Layout of Defences Construction • OBC project delivery - Sterte £390k Creekmoor £250k • Procured under single contract • Avon Construction • Tendered combined construction value - £400k • Total cost – Sterte £322k Creekmoor £203k • Included new pump and flap valves at Sterte PS • Improved cycle access • Appetite for repeating at Fleetsbridge inlet Thank you [email protected].
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