The Moors at Arne Project Managing Change

The Moors at Arne Project Managing change

Welcome to this consultation about the Moors at Arne Project 1 Purpose of consultation •Introduce the project •Ask for your views •Outline the next steps in the project

Project introduction

Poole The Moors at Arne were identified by the Poole Bay, Poole Harbour and Wareham Flood and Coastal Erosion Risk Management Strategy as the prime site for enhancing protected habitats and working to offset intertidal habitat losses (coastal squeeze). The Moors at Arne The Environment Agency, RSPB and Natural England are working together on an exciting opportunity to enhance the area of The Moors at Arne. This project will Wareham enhance intertidal habitat, improve the resilience of freshwater habitat and enable the Environment Agency and its partners to continue protecting properties in the Poole Harbour area from future flood risk.

With sea level rise, important habitat for wildlife along the coast will be lost over © OpenStreetMap.org the next 30 years. This "coastal squeeze", where rising waters press against fixed sea defences, means that we need to create new places for coastal wildlife if it is Location map to be guaranteed a safe home. This project offers potential to make this site more resilient for sea level rise in the future and to manage the changes as naturally as possible. It is important to us that the community are involved in the project right from the start. We are planning a range of engagement activities. The partnership of the three organisations will aim to maximise the benefits for local people, recreational users and wildlife.

Photo © Environment Agency

Project background Who are the partners for this project?

The Poole Bay, Poole Harbour and Wareham Flood and Coastal Erosion Risk Management Strategy, adopted in 2015, found that increased flood & erosion risk (700mm SLR by 2100) in Poole Harbour will lead to over 10,000 properties at risk by 2100 with present value benefits of £1.75 billion. Existing developments justify a Hold The Line Policy in many areas (Shoreline Management Plan, 2010), the resulting intertidal habitat loss predictions are: •Epoch 1: 2030 – 44ha •Epoch 2: 2060 – 87ha •Epoch 3: 2110 – 313ha

Please ensure feedback reaches us by: Why your comments are important to us •We want to maximise the benefit to the local October community so it is important that we understand Your your views and perspective. views 27 1 The Moors at Arne Project Managing change 2 Water levels – changing habitat…

3.00mOD: The road level at Ridge Farm entrance Poole Harbour water levels

1.89mOD: 1 in 200 year flood level 1.38mOD: Highest Astronomical Tide (HAT) at Wareham/The lowest level of the existing banks 1.30mOD: Lowest level on the Ridge Boatyard access track 1.23mOD: The lowest point of the Arne Road

0.80mOD: Typical foreshore level (harbourside) 0.25mOD: The lower levels of the Arne site (landside) 0.20mOD: Mean Tide Level (MTL) Roman remains are buried by 0.00metres Ordnance Datum (OD) the 15th Century quay at the Foundry on Poole waterfront.

‐1.4mOD: Lowest Astronomical Tide (LAT) /Chart Datum ‐1.6mOD: Highest Astronomical Tide (HAT) in Roman period

Archaeological evidence indicates that Poole Harbour was only 25% of its current size in the Roman period. Water Area shown consistent with maximum tidal extent during Roman period.

Ordnance Survey map

Since the Roman period, high water at Brownsea Island has increased by approximately 3 metres.

Ownership through the years

Frome

Legend RSPB Land Current Seawall

Ridge Wharf

Ralph Treswell Survey 1586 DHC D/BKL

Ridge Farm

0 45 90 180 270 360 Meters Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community OS 25 inch surveyed 1887 and published 1890 Dorset L.6 Arne Moor 2017 RSPB land Current Seawall

Notes:

Changing demands 0SRADLWDLW250917Baseline

RevByChkdApprvdDate Description

Environment Agency, South West Office, Manley House, © Copyright © Copyright Kestrel Way, Clay export Moorings Exeter, Devon, EX2 7LQ CH2M, Ash House, Falcon Road, Sowton, Exeter, EX2 7LB ABPmer Quayside Suite, Medina Chambers, Town Quay, Southampton, SO14 2AQ

Project POOLE HARBOUR HABITAT CREATION APPRAISAL

Drawing Arne Moors / Wareham Meadows at present

Drawn by: Susanne Rupp-Armstrong Date: 25/09/2017 Checked by: Daniel Williamson Date: 25/09/2017

Approved by: Daniel Williamson Date: 25/09/2017

Drawing No. Revision Fig_Arne_Baseline_09_17_v0 1

Drawing Scale (A3): 1:6,500

Document Path: T:\4513_Arne_Poole_MR\GIS\Fig_Arne_Baseline_09_17.mxd 2 The Moors at Arne Project Managing change

Building on success 3

Medmerry... Wallasea... Steart...

This managed realignment scheme near Selsey (West Sussex) The RSPB’s flagship Wallasea Island Wild Coast Project lies This large scale coastal habitat creation scheme on the was completed for the Environment Agency in 2013, and is at the junction of the Crouch and Roach Estuaries (Essex). Steart Peninsula near Bridgwater (Somerset) has led to the now managed by the RSPB. It is the largest open–coast The majority of this larger scale (677 ha) coastal habitat creation of more than 400 hectares of valuable natural realignment scheme in Europe and measures 300 ha, over restoration initiative has to date been completed, including habitats (intertidal and freshwater). Implemented in 2014 half of which is intertidal habitat. The scheme has led to the 165 ha Jubilee Marsh managed realignment (breached for the Environment Agency, and now managed by the greatly reduced flood risk for adjacent homes and businesses in 2015), as well as two tidal exchange lagoons and Wildfowl and Wetlands Trust (WWT), it has enabled and has also created space for important habitats and for freshwater marshes (just over 200 ha). The remainder of increased flood protection for thousands of people living people to enjoy. the RSPB’s Wallasea land will be transformed into lagoons around the Severn Estuary. Steart Marshes is the first of and marshes over the next few years. The scheme has WWT’s Working Wetlands – places that demonstrate how already led to a notable increase in both birds and people wetlands are productive and useful. visiting the island. West Public footpath to village Wittering Bridgwater Bay Stteeaarrtt vviilllaaggee Permissive footpath to breach [ Estuarine mudflats Trail Steart Gate car park tt re r Pagham Pa Harbour

Stert Drove Breach Steart Marsh Coastal marsh

East Wittering Public footpath ends. Permissive footpath starts WWT Main car parkGrazing marsh Bracklesham Polden hide Resseerrvvee ofﬁce Estuarine mudflats PLACEHOLDWEetland R FOR SaltmarsTh MudflatEART PLAN walkway Viewing Mendip hide PLACEHOLDER FOR WALLASEA platform Stockland Marshes Freshwater marsh Permissive footpath Quantock hidesArable & wild & wiw River Parrett Stockckland Bristol bird mix il Public footpath and Flower rich ra T permissive cycle path t grassland t e r Otterhampton Marsh r a PLAN Coastal marsh P Medmerry Public bridleway Otterhamerhampton Pylons Viewing Accessible path platform for pedestrians and wheelchairs

Permissive footpath Arable & wild bird mix

il View point and/or a r 1 kilometre T camera point t

Selsey r

a P Combwich Wetlands working for wildlife and people

PLACEHOLDER FOR MEDMERRY PHOTO PLACEHOLDER FOR WALLASEA PHOTO

Photo © RSPB Photo © Environment Agency Photo © Environment Agency

What will the Project make space for?

•Saltmarsh habitat •Mudflats •Saline lagoons

But, also: Saltmarsh at Steart Management Realignment Scheme © Nigel Pontee •Development of new flood Mudflat on the Colne and Blackwater Estuary, Essex defences within Poole Harbour •Visitors

PLACEHOLDER FOR IMAGE OF LAGOON

PLACEHOLDER FOR IMAGE OF SALINE Lagoon at Steart Management Realignment Scheme LAGOON (?) Flood defence example © Environment Agency Aerial View of The Moors at Arne (looking West) 3 The Moors at Arne Project Managing change

Emerging themes 4 Work with natural processes Work with partners Elevation (mOD) (2008 DTM) Proposed new features Protect properties ‐1.1 – 0.1 New tide banks Protect rare and irreplaceable habitats 0.11 – 0.38 New lagoon bunds 0.39 – 0.88 Breaches (approximate width) Develop a mosaic of natural habitats, including: 0.89 – 1.4 New fronting channel •Saltmarsh 1.5 – 2.4 New/enhanced on‐site channels >2.4 Tidal exchange culverts •Mudflats Inter‐lagoon exchange structure Helping us make the right decision •Lagoons Furzebrook drainage outfall

Public engagement

Partnering

Site investigation

Modelling

PLACEHOLDER FOR CHANGING LAND USE

farming / navigation / mining ?

Project Constraints and Opportunities

Ground Investigation Local Drainage Visitor paths & Surface Water Topographic Services Fluvial Parking

Unexploded Site Heritage & Flood Risk ordnance InformatioAnr chaeology Access

Tidal View Points

The Project Navigation Traffic

Construction Cost

Noise Timing

Mudflat Maintenance Residual Life Environmental Designations Environment Asset Management Redundancy Saltmarsh Resilience Sustainability Habitat Regulations Assessment

SACSpecial Areas of Conservation SSSISite of Special Scientific Interest SPASpecial Protection Area RAMSARConvention on Wetlands of International Importance especially as Waterfowl Habitat 4 The Moors at Arne Project Managing change

Timeline and next steps 5

20120177 2018 2019 2020 2021 2022

Initial appraisal / optioneering

Outline design and preparation of planning permission

Next Public Event (winter 2018)

Construction

To comment on the information you’ve seen today: Please ensure feedback •Add your thoughts and concerns to the issue board reaches us by: •Speak to one of our team and fill in a feedback form October Your •Fill in a feedback form and hand it to the team •Take away a feedback form or email us at: 27 views [email protected] Please ensure all feedback reaches us by 27th October 2017. 5