Strategies and Policy
We use this 3 tiered approach when managing our
coastline.
- North Solent Shoreline Management Plan
(
NSSMP
) -
The
NSSMP
outlines
proposals to manage the coastal flood and erosion risks to the
shoreline for up to the next 100 years
-
-
-
Hayling Island -
Eastoke Strategy Appraisal Report - October
2006 - This Strategy considers
the section of coastline between Bound Lane, round Eastoke
peninsula, and as far as St Hermans Road at the end of Eastoke
Creek.
-
-
-
1. Shoreline Management Plan
1. North Solent Shoreline Management Plan (
NSSMP
)
The North Solent Shoreline Management Plan (NSSMP) was submitted
for approval in December 2010 and approved by the Environment
Agency in May 2011. The
NSSMP
outlines
proposals to manage the coastal flood and erosion risks to the
shoreline up to the next 100 years.
It recommends one of the following four policies for each
area:
- Hold the line - maintain
or upgrade the level of protection provided by existing
defences.
-
Advance the line - build new defences seaward
of existing defences.
-
Managed realignment - allow retreat of the
shoreline with management to control or limit movement.
-
No active intervention - not to invest in
providing or maintaining defences.
The Coastal Partnership's diverse coastline ranges
from internationally important habitats in the harbours,
to communities at risk of flooding from the sea. The
NSSMP
proposes long-term policies to balance the needs of people and the
environment.
Copies of the final
NSSMP
can be found
upon request in Havant, Portsmouth and
Gosport's central libraries, at each of their civic
offices and online at:
http://www.northsolentsmp.co.uk/
2. Flood and Coastal Erosion Risk Management
Strategy
Flood and Coastal Erosion Risk Management (FCERM) Strategies are
sets of documents which consider the various options available for
managing sections of the coastline, and propose a solution which is
economically, socially and environmentally acceptable within the
restraints which apply to that location.
1. Portsea Island Coastal Strategy Study (
PICSS
)
PICSS identified that Portsea Island consists of 7
independent flood cells (as shown on the map below). Because they
are independent it means that if one cell was to
flood (or breach) from the sea the flood water would not
flow into a neighbouring flood cell.
The strategy concluded that 'Holding the
line' to Portsea Island is imperative in order to
protect the population of the city and its infrastructure from the
risk of flooding from the sea but it also recognises that in
some areas Capital Grant funding from the Government is
not justifiable and recommends that frontagers,
developers and other beneficiaries should contribute to the
upkeep of their own coastal defences.
Click here to
see the Portsea
Island Coastal Strategy Study >>
PICSS does identify that Flood Cell 1 –
Southsea and Flood Cell 4 – North Portsea
Island are both priority frontages and recommends
that coastal flood and erosion risk
management solutions are prepared at the earliest
opportunity to manage the risks of flooding from the sea
to the existing communities and infrastructure on the Island.
The Coastal Defence Partnership Team has started the
development of options for these frontages and more information
will appear here soon!
Portsea Island Climate Change Flood Risk
 |
 |
|
Current Flood Risk (Year 0)
|
Future Flood Risk with Climate Change (Year
100) |
Floods in Flood Cell 1 -
Southsea
Photographs Courtesy of The News
Click here to see Current
Updates of the Portsea Island Coastal Strategy
Study >>
2. Portchester Castle to Emsworth Coastal Flood and
Erosion Risk Management Strategy
This Strategy considers the section of mainland coastline
between Portchester Castle and Emsworth.
The Environment Agency is working in partnership with Havant
Borough, Portsmouth City, Fareham Borough, and Chichester District
Councils to produce the Portchester Castle to Emsworth Coastal
Flood and Erosion risk Management Strategy. This will
consider the mainland coastline from Portchester to
Emsworth.
Flooding and Erosion are real risks facing people and their
property on this coastline. The purpose of the strategy is to
identify the best way of managing coastal flood & erosion risk
along this frontage over the next 100 years.
Strategy Consultation (external website) >>
Click here to see Current
Updates of the Portchester to Emsworth Strategy
>>
3. Eastoke Strategy Appraisal Report - October
2006
This Strategy considers the section of coastline between Bound
Lane, round Eastoke peninsula, and as far as St Hermans Road at the
end of Eastoke Creek.
Authority Scheme Reference:-
K 2A1 H16 001180
Promoting
Authority:-
Havant Borough Council &
Environment Agency Southern Region
Scheme
Name:-
HAYLING ISLAND: EASTOKE SECTORAL STRATEGY
STUDY
Date:-
October 2006
STRATEGY CONTENTS:
MAIN
STRATEGY
Executive Summary, Business Case,
Project Plan & Recommendations (pdf 352
kb
)
PHOTOGRAPHS (pdf 793kb)
Southern Frontage: Historic
Photos
Southern Frontage: Contemporary (3rd
November 2005)
Northern Frontage: Pre 2005
Northern Frontage: New Works
APPENDICES
Addendum - Change to investment
date for main Southern Frontage (pdf 142kb)
Appendix
1 - Scheme Development and Previous
Reports (pdf 208
kb
)
Appendix
2 - Baseline
Information (pdf 497kb)
Appendix 3 -
Consideration of the 'Do Nothing' and selection of
the preferred scheme
option (pdf 469kb)
Appendix 4 - Scheme
Costs (pdf 4169kb)
Appendix 5 - Economic
Appraisal (pdf 1658kb)
Appendix 6 - Cashflow and
Programme (pdf 59kb)
Appendix 7 -
Risk (pdf 192
kb
)
Appendix 8 -
Communications and Consultation (pdf 1132kb)
Appendix 9 - Strategic Environmental Framework
Report (pdf 1256kb)
FIGURES
Fig 1- Location
Map (376kb)
Fig 2A - Consequences of 'Do
Nothing' in Year 25 (1056kb)
Fig 2B - Consequences of 'Do
Nothing' in Year 50 (1173kb)
Fig 2C - Consequences of
'Do Nothing' in Year 100 (1234kb)
Fig 3 - Environmental
Constraints Map (1540kb)
Fig 4 - Preferred
Option (1194kb)
Fig 5 - Options for Southern
Frontage (1542kb)
Fig 6 - Options for Northern
Frontage (943kb)
Fig 7 - Indicative Landscape
Plan (1604kb)
3. SCHEME
The Scheme is the actual works carried out along the coast line
where a need has been identified by the
SMP
and subsequent
Strategy. The schemes are the 'on the ground' construction
works, for example; building of sea walls, carrying out Beach
Recycling and building Groynes to manage the risks identified in
the Strategy for that stretch of coastline.
1. Beach Management
2. Hayling Island - Eastoke Point Coastal Defence
Study
Following the recommendations of the Eastoke Sectoral Strategy
Study, Havant Borough Council commissioned HR Wallingford to
undertake the 'Eastoke Point Coastal Defence Study'.
Photograph showing location of study area,
Eastoke Point
Study Objective
The primary objective of the study has been to develop a
sustainable coastal defence scheme for managing coastal erosion and
flooding risks along the Eastoke Point frontage. Situated in
the south eastern corner of Hayling Island, this is a highly
dynamic coastline that is becoming increasingly difficult to manage
and maintain.
The study was completed in 2009 and has identified an outline
scheme to reduce the risk along this frontage.
The key stages of the study were as
follows:
- Review of historical data, published literature and
reports
- Predict future beach evolution
- Analysis of Flood & Erosion risks
- Technical, Environmental, & Economic Option appraisal
- Comparison & selection of preferred option
Background
This coastline has a long-term history of
retreat and varying plan shape, as a result of rising sea levels,
variations in the wave climate and changes in the position and
alignment of both the deep channel through the entrance to
Chichester Harbour and the banks of the ebb shoal delta that form
on either side of that channel. This study includes a review
of all these effects as an essential background to the
consideration of the future management of the Eastoke Point
coastline.
The overall coastal defence policy for this
frontage was established in 1996 in the East Solent Shoreline
Management Plan and is to “Hold the Line”. Subsequently, in
2006, a detailed Coastal Defence Strategy Study for the whole
Eastoke peninsula (The Eastoke Sectoral Strategy Study) was carried
out and considered some options for suitable coastal defence
schemes for Eastoke Point that would provide an adequate standard
of protection to these low-lying residential areas. The
Eastoke Sectoral Strategy Study supported the Hold the Line policy
for the frontage and recommended that the defences are improved to
give a standard of protection of 0.5%, i.e. protecting the assets
at risk from storm events with a return period of 200 years.
The study has extended and refined the earlier
Eastoke Sectoral Strategy, considering a wide range of coastal
defence options and comparing these from the viewpoints of their
technical feasibility, their environmental effects and their
economic benefits.
Flood and Erosion Risks
Photograph showing breach at Eastoke Point in
1992
In 1992 a breach occurred in the defences
around Eastoke Point and emergency works were undertaken. These
works involved the construction of 150 metres of rock revetment and
rock stub groynes. At present, beach levels along much of the
southern coastline of the Eastoke peninsula are being managed to
provide an adequate standard of defence against coastal flooding
and erosion. In addition, defences have recently been
improved along the northern shoreline of the peninsula, reducing
risk of tidal inundation from that coastline. Around Eastoke
Point, however, the present standard of protection against
coastal flooding and erosion is considered to be low.
Option Appraisal
A wide range of defence options for Eastoke Point have been
assessed in the study. An initial long-list of techniques
used around the UK and overseas were assessed for their suitability
for the Eastoke Point frontage, based on specialist judgement, and
were reduced in number to a short-list of potentially suitable
methods. This Initial screening of coastal defence ‘elements’ and
of beach management methods identified a number of possible
approaches for managing flood & erosion risks at Eastoke Point.
However, it was concluded that no single element was sufficient on
its own, mainly because of the very variable nature of the
hydrodynamic and sediment transport processes and thus of the
beaches themselves. Any successful scheme would need to be capable
of adaptation in the light of changes to wave conditions, tidal
levels and currents which are all affected by unpredictable changes
to nearshore seabed. As a result a number of combinations of
coastal defence elements and management methods were short-listed
as follows:
Option 0 – Do Nothing
Option 1 – Do minimum
Option 2 - Beach Recharge & recycling (alone)
Option 3 - Timber groynes, recharge & recycling
Option 4 - Rock groynes, recharge & recycling
Option 5 - Rock revetment with
groynes, recharge and recycling
Option 6 - Seawall with groynes, recharge and recycling
The short-listed options were compared using a multi-criteria
analysis that allowed consideration of their technical feasibility,
their likely environmental acceptability including sustainability
and their economic benefits.
Conclusions and
Recommendations
The study has identified Option 5 as the
preferred coastal defence approach for Eastoke Point. The proposed
scheme comprises of the following principal coastal defence
elements:
- Groyne replacement or
improvement
- Rock revetment
- Improvement or installation of splash
wall
- Beach recharge
- Groyne maintenance
- Revetment maintenance
- Maintain splash wall
- Beach recycling and
management
Beach monitoring also forms an important part of the proposal,
to help optimise the coastal defence scheme. The link below
shows an indicative layout of the scheme. The elements of the
scheme will need to be refined further at the detailed design
stage. To view the outline scheme please follow the link
below (Acrobat Reader Required):
Link to outline scheme layout (pdf
208kb) >>
The present value cost, projected over 100 years, of the
proposed scheme is approximately £7million.
Public Exhibitions
On the 7th and 8th December 2009 public exhibitions were held at
Hayling Island Sailing Club, Eastoke. This provided an opportunity
for residents and the wider community to find out more about
the Eastoke Point Study, view the outline scheme
proposals for coastal defences at Eastoke Point and to discuss
ideas with members of the project team.
The feedback received from these sessions has
been very positive. Of the 136 members of the public that filled
out response forms, 86% were supportive of the plans.
96% of people that were asked said there was a
need to reduce the risk of coastal flooding and erosion at Eastoke.
Over 100 residents that attended the exhibition were from Eastoke
and many had been informed of the event by letter.
Most of the people asked felt the information
that was presented at the exhibition, including plans for a rock
revetment buried in the beach crest, was good. 67% lived on a flood
plain as shown in the Environment Agency flood maps and 54% have
signed up to EA flood warnings. Yet 60% of these people don’t take
preventative flood measures on their property.
Councillor Jenny Wride, whose portfolio
includes coastal management, says: “It was very encouraging to have
the support of the majority of people who attended the exhibitions.
The Coastal Team continue to monitor the most vulnerable points
along our coastline. They are also available to provide advice to
residents on ways in which they can take preventative measures to
protect their properties.”
View the Eastoke Point Study
To view the Eastoke Point Coastal Defence Study, please follow
the links below (Acrobat Reader Required):
Executive Summary (pdf
292kb)
1 -
Introduction (pdf 890kb)
2
- History of Coastal Defences at Eastoke (pdf 152kb)
3 - Coastal
Processes Assessment (pdf 2,831kb)
Figure
3.5 (pdf 976kb)
Figure
3.6 (pdf 256kb)
Figure
3.12 (pdf 263kb)
Figure
3.13 (pdf 347kb)
Figure
3.14 (pdf 3,148kb)
4 -
Physical Survey of Defence Structures (pdf 2,668kb)
5 - Baseline
Environmental Statement (pdf 720kb)
6 - Assessment of Erosion Losses: Do Nothing Scenario (pdf
410kb)
7 - Flood Risk
Assessment (pdf 485kb)
Figure 7.3
(pdf 479kb)
Figure 7.4
(pdf 705kb)
Figure 7.5
(pdf 672kb)
Figure 7.6
(pdf 429kb)
Figure 7.7
(pdf 562
kb
)
Figure 7.8
(pdf 558kb)
Figure 7.9
(pdf 368kb)
Figure 7.10
(pdf 570kb)
Figure 7.11
(pdf 561kb)
Figure 7.12
(pdf 330kb)
Figure 7.13
(pdf 568kb)
Figure 7.14
(pdf 559kb)
8 - Coastal Defence Options: Generation and
Evaluation (pdf 4,781kb)
9 - Economic
Appraisal of Options (pdf 269kb)
10 - Overall
Study Conclusions and Recommendations (pdf 36kb)
11 -
References (pdf 23kb)
Appendices (pdf 2,841
kb
)
Or, alternatively a link to the full report can be found
below:
Eastoke Point Coastal Defence Study (pdf 30,633kb)
3. Eastoke Point Coastal Defence Scheme
Development Stage
Following the successful completion of the
study as described above Havant Borough Council applied to the
Environment Agency for funding to take the scheme forward.
This proposal was adopted after HR Wallingford
was commissioned to develop the Eastoke Point Coastal Defence Study
2009 on behalf of Havant Borough Council. If work is not
undertaken up to 1,700 properties on the south east of Hayling
could be at risk of flooding over the next 100 years.
The Environment Agency gave technical approval
on the 5th August 2010 to commence detailed design of
the scheme and to obtain the necessary planning and other consents
to enable the main scheme to be constructed. The construction
of the main scheme however is dependant on there being sufficient
funds from central government available.
The development stage commenced in September
2010 and it is hoped that the design will be completed and the
necessary consents obtained by early 2012 dependant on the amount
of funds made available by the Environment Agency.
The new project includes:
- A rock revetment buried at the top of the beach along the whole
frontage to protect residents and their properties plus the Sandy
Point Nature Reserve.
- New rock groynes to reduce the movement of beach material and
long shore drift.
- Upgrading the existing revetment and groynes near the Lifeboat
station.
- Improving the ‘Splash Wall’ to the rear of the eastern end of
the promenade which will reduce the risk of flooding to homes in
the area.
- Continued beach management with nourishment, recycling and
monitoring of material. This activity will maintain the beach as
the primary defence at Eastoke.
Preliminary site works were carried out in
Winter 2010 to determine the current condition and positions of the
defences, works on the detailed design started in the New
Year. Once our Coastal Engineer develops the key
specifications for the scheme to ensure it provides adequate
coastal protection, we will be holding further public exhibitions
to determine your views on the designs. Follow the link below
for current updates of the project.
For any questions or more information please
contact Clive Evans on 02392 446 617 or
clive.evans@havant.gov.uk
Click here to see Current Updates
of the Eastoke Point Coastal Defences Works>>