appendix d - assessment matrices nsc lfrms sea - np...

Appendix A

Pla

Appendix D

Assessment Matrices

SEA of North Somerset Council LFRMS Appendix D 1

Assessment Approach

The LFRMS measures have been evaluated in light of their potential significant environmental effects on the

different SEA topics. The assessment of these environmental effects has been informed by professional

judgement and experience with other LFRMS SEAs.

For all measures, the table will be used to evaluate how the environment would be affected, positively or

negatively, from the implementation of the plan in relation to the objectives and indicators that comprise the

environmental baseline. All LFRMS measures will be assessed based on their type and their likely impact

duration and magnitude. Results of the assessment will then be considered in light of the evolution of the

environment in the absence of the plan.

Effects of the LFRMS will be described in terms of whether they are positive, neutral, negative or uncertain, as

shown in Figure D1. Where any cumulative, synergistic or secondary effects are identified they will be noted.

Similarly, if there are any positive or negative synergies between the LFRMS and other plans, programmes or

projects the synergies will also be noted.

Effects of the LFRMS will be described in terms of their:

(a) Nature: whether they are anticipated to be:

• Positive (+);

• Neutral (N);

• Negative (x); or

• Uncertain (?).

(b) Duration: the duration of potential effects are presented in terms of the timescale over which they are

anticipated:

• Short term effects: effects expected in the next 1 to 5 years;

• Medium term effects: effects expected in the next 5 to 10 years; and

• Long term effects: effects expected in the next 10+ years.

(c) Permanence and Reversibility:

• A permanent effect is one which results from a physical change that is anticipated to last beyond the

life of the LFRMS;

• A temporary effect is one which results from an operational change which could change if there is a

change of policy, or a short term condition such as a construction phase related impact;

• A reversible effect is an environmental effect that can be reversed, for example an incident of water

pollution can be cleaned up over time; and

• An irreversible effect is an environmental effect that cannot be reversed such as the loss of a historic

feature or the loss of agricultural soil due to erosion.

(d) Spatial Scale:

• Local: effect is restricted to the immediate location of the proposal or to a specific site or settlement

within North Somerset;


• Regional: effect is anticipated to cover a significant proportion of the counties surrounding North

Somerset; and

• National: effect covers the whole of England and/or the UK (also includes international), or an asset

which is relevant at this scale.

The significance of effects upon each of the SEA objectives will then be evaluated using the scoring criteria

outlined below (Figure D1). The determination of significance would take into account the criteria set out in the

SEA Directive’s Annex II.

++

Major

Positive

The option would be significantly beneficial to the SEA objective by resolving an existing

environmental issue and/or maximising opportunities for environmental enhancement.

+

Minor

Positive

The option would be partially beneficial to the SEA objective by contributing to

resolving an existing environmental issue and/or offering opportunity for some

environmental enhancement. This effect would not be considered to be of significance.

N

Neutral The option would have a neutral effect on the SEA objective.

?

Uncertain

There is insufficient detail available on the option or the baseline situation in order to

assess how significantly the SEA objective would be affected by the option.

x

Minor

Negative

The option would partly undermine the SEA objective by contributing to an

environmental problem and/or partially undermine opportunities for environmental

enhancement. This effect would not be considered to be of significance.

xx

Major

Negative

The option would severely undermine the SEA objective by contributing to an

environmental problem and/or undermining opportunities for environmental

enhancement. This would be considered to be a significant effect.

Figure D1: Assessment CriteriaTable D1 shows the SEA objectives and their underlying assessment

criteria.

SEA of North Somerset Council LFRMS Appendix D

Table D1: SEA Objectives and their assessment criteria

SEA Topic(s) Draft LFRMS SEA Objective

Biodiversity, flora and fauna

1. To conserve and enhance thebiodiversity, flora and faunaNorth Somerset

The Historic Environment Landscape and Visual Amenity

2. Conserve and enhance Somerset’s historic environment and heritage assets of historic, archaeological, architectural or artistic interest and their settings

Landscape and Visual Amenity

3. Protect and enhance the unique setting and landscape character of North Somerset

Water and Hydromorphology

Population and Human Health, Biodiversity, Flora and Fauna

4. Minimise adverse effects of drainage on the aquatic environment


Draft LFRMS SEA Objective Underlying Assessme

Would the LFRMS, in combination with other plans…

erve and enhance the biodiversity, flora and fauna of North Somerset.

• Reduce damage to, fragmentation or loss of existing designated wildlife siteslocal, national or international designations), wildlife corridors and

• Support opportunities to create and enhance biodiversity?

• Maintain or improve existing water levels and water quality?

• Address biodiversity risk associated with low flow conditions?

• Reduce the risk of spreading non-native invasive species?

2. Conserve and enhance North historic environment

and heritage assets of historic, archaeological, architectural or artistic interest and their settings.

• Cause visual intrusion to historic landscapes, heritage assets or their setting?

• Cause any direct or indirect physical impacts on the North Somersethistoric, archaeological, architectural or artistic interest, or their settings?

• Promote schemes that enhance the condition and character and promote understanding of the significance of conservation areas and other heritage assets and their settings?

• Aid the management of heritage assets, e.g. through changes to land management?

• Promote the conservation and understanding ofbeen used for water and flood management?

3. Protect and enhance the unique setting and landscape character of North Somerset.

• Cause permanent visual intrusion in areas of notable landscape character or alter the character of locations regarded as locally distinctive?

• Relieve intrusion or disturbance from existing areas of high landscape value?

• Enhance the range and quality of the public realm, ispaces?

4. Minimise adverse effects of drainage on the aquatic environment.

Drainage

• Result in improved drainage and attenuation (e.g. installation of SuDS), so that surface run-off is controlled to reduce pollution of soils and watercourses as well as run-off rates?

Water quality

• Improve water retention in dry areas?

• Reduce flood risk (from surface, groundwater and ordinary water courses) to sewerage network, including sewage treatment works?

Underlying Assessment Criteria


damage to, fragmentation or loss of existing designated wildlife sites (with , wildlife corridors and priority habitats?

enhance biodiversity?

or improve existing water levels and water quality?

biodiversity risk associated with low flow conditions?

native invasive species?

visual intrusion to historic landscapes, heritage assets or their setting?

t physical impacts on the North Somerset's features of historic, archaeological, architectural or artistic interest, or their settings?

hat enhance the condition and character and promote understanding of the significance of conservation areas and other heritage assets

the management of heritage assets, e.g. through changes to land management?

conservation and understanding of historic structures that are or have been used for water and flood management?

visual intrusion in areas of notable landscape character or alter the character of locations regarded as locally distinctive?

intrusion or disturbance from existing areas of high landscape value?

the range and quality of the public realm, including viewpoints and open

in improved drainage and attenuation (e.g. installation of SuDS), so that off is controlled to reduce pollution of soils and watercourses as well as

ace, groundwater and ordinary water courses) to sewerage network, including sewage treatment works?


SEA Topic(s) Draft LFRMS SEA Objective Underlying Assessment Criteria


• Reduce flood risk for known areas of contaminated land?

• Result in deterioration of the physical, chemical or biological status of surface freshwater (including lakes, streams and rivers), groundwaters, estuaries, or coastal waters out to one mile from low-water?

• Improve the ecological conditions of water bodies, with respect to the Water Framework Directive?

• Prevent or assist future improvement of the physical, chemical or biological status of surface freshwater, groundwaters, estuaries, or coastal waters out to one mile from low-water?


Population and Human Health, Biodiversity, Flora and Fauna

5. Minimise adverse effects on water resource availability

• Result in changes in flow regime (e.g. low flow, variability of flow/ levels)

• Affect the quantity (total storage capacity) or quality of water used for abstraction?

• Improve groundwater recharge?


6. Minimise adverse effects on water hydromorphology and natural processes

• Improve or reduce the morphological status of ordinary water courses – i.e., will it: a) Minimise changes to hydromorphology and/or improve current status?; b) Cause changes to bank structure; c) Result in opening of existing culverts?; d) Increase potential for bank-side erosion?; d) Lead to loss of floodplain wetlands; e) Lead to loss of bank-side vegetation; f) Result in removal of sediment or gravels; g) Result in the installation of in-channel structures?

• Help restore riparian corridors, including floodplain connectivity and natural processes?

Climate change

7. Adapt new and existing development to the impacts of climate change

• take into account UKCP09 and other climate change scenarios (if available) with respect to predicted maximum high and low temperatures, freeze-thaws, rainfall and storminess?

• help reduce flood risk to receptors across the range of SEA topic areas?

• help reduce the impact of flood risk across the range of SEA topic areas?




Soils, Geology and Geomorphology

8. Protect soils and geological resources in North Somerset

• require or encourage LFRMS scheme construction on previously undeveloped land?

• reduce risk of soil contamination, e.g. through remediation of contaminated land, or reducing flood risk for known areas of contaminated land?

• retain or affect sections of geological or geomorphological importance (SSSIs and Local Geological Sites)?

• retain or enhance groundwater levels to improve soils?

• retain or enhance flood attenuation rates and water retention capacity of soil where necessary to protect soil structure or soil biodiversity?

• protect or increase vegetation and/or organic debris cover of soil?

• protect soil function and structure, i.e. reduce risk of compaction and sealing and promote best practice land management during construction of any FRM measures?

• reduce soil erosion caused by flooding?

Material Assets

9. Minimise adverse impacts of local flood risk on key infrastructure, land assets and properties

• improve protection of existing or proposed key transport routes (recreational and commercial) or infrastructure e.g. closures/ restrictions?

• ensure the protection of services, including water, power and telecommunications?

• reduce flood risk to properties?

• have a positive impact on the local economy? e.g. through improved flood protection or enhanced recreation opportunities and green infrastructure provision

• reduce flood risk to areas of high quality agricultural land?

• reduce flood risk to areas important for their mineral resources?

• reduce flood risk to the access routes used to access any of the above assets?

Population and Human Health

10. Conserve and seek to enhance open spaces, recreational areas and rights of way

• create new/additional recreational facilities, or improve potential to increase amenity/access to the countryside/ green infrastructure?

• protect and enhance existing open spaces, recreational areas, facilities and rights of way in the long term?

• affect any recreational fisheries associated with ordinary watercourses?




Population and Human Health

11. Protect human health • reduce flood risk and the risk of direct physical impacts of flooding on people?

• restrict people’s access to medical services, such as hospitals, doctor’s surgeries and pharmacies?

• help provide safe development?

• reduce fear of flooding?

• create areas of standing water or new water channels that could become a potential health hazard due to safety or increased disease risk?


Compatibility of draft LFRMS ‘Measures’ with SEA objectives

Under each of the LFRMS Objectives in Table 4.2 of the LFRMS, there are a series of measures

that have been put in place to help deliver the LFRMS objectives. These provide more detail

than the LFRMS objectives themselves. The LFRMS measures are described in Chapter 6 of

the main LFRMS report.


Table D2 Compatibility of LFRMS Measures and SEA Objectives

Strategic Objective (SO) and Underlying

Measures

SEA Objectives (abridged)

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SO1.

Improve

understanding

of flood and

coastal erosion

risks in North

Somerset

i) Establish an enhanced asset

register (‘asset register plus’) to

improve our understanding

and management of assets

which have a significant impact

on local flood risk

N N N N N N ++ N ++ N +

ii) Develop protocols for the

reporting and investigation of

flooding incidents and will

ensure that flood incidents are

investigated in accordance with

our statutory duties

N N N N N N ++ N ++ N +

iii) Develop protocols for

designating structures or

features and propose to

designate key structures or

N + N N N N ++ N ++ N +



Measures


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features



Measures


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iv) Work closely with parish

councils to collate historic flood

incident data, which will be

used to update the vulnerable

communities’ assessment. We

will establish a mechanism to

enable improved transfer of

information from parish

councils to NSC in the event of

future flooding incidents

v) work with community

resilience groups in

communities most vulnerable

to flooding to ensure they are

aware of the risks they face and

are prepared to take action to

reduce the impacts of future

flooding incidents



Measures


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vi) develop protocols for the

consenting and enforcement on

ordinary watercourses

SO2.

Develop plans

and policies to

manage these

risks

sustainably

i) Implement the funding

strategy and track

opportunities to secure external

funding for flood risk

management

N N N N N N ++ N ++ N +

ii) We will develop protocols

for the consenting and

enforcement on ordinary

watercourses

++ N N ++ N ++ ++ + ++ + +

SO3.

Work in

partnership

with other

Continue to work in

partnership with risk

management authorities

through the SFMB

N N N N N N ++ N ++ N +



Measures


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flood risk

management

authorities

and lead by

example

SO4.

Maintain and

improve flood

and coastal

erosion risk

management

infrastructure

and systems

i) We will manage the

stretch of coastline where NSC

acts as the operating authority,

in partnership with the

Environment Agency

+ + ++ N N N ++ N ++ N +

ii) Develop a risk based

approach to the maintenance of

assets on the highest risk

locations, using the ‘asset

register plus’ as the platform to

accomplish this

N ++ N N N N ++ N ++ N +



Measures


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iii) We will encourage and

promote investment in

drainage and flood risk

management infrastructure

which achieves multiple

benefits (e.g. green

infrastructure)

+ N + + N N ++ + ++ + +

SO5.

Avoid

inappropriate

development

in areas of

i) Develop the SUDS Approval

Body protocols in time for

commencement of Schedule 3

of the FWMA (date to be

confirmed)

+ N + ++ N + ++ + ++ + +



Measures


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ii) Develop local SUDS

guidance to set out the vision

for the design of SUDS in North

Somerset

+ N + ++ N + ++ + ++ + +

iii) Continue to improve

linkages with development

management services to inform

decisions on planning

applications

N N N N N N ++ N ++ N +

SO6.

Increase

public

awareness of

flooding and

promote

individual and

community

i) Introduce a Flood Action

Hotline to simplify reporting of

flooding incidents

N N N N N N N N N N ++

ii) Publish up to date surface

water mapping to raise

awareness of surface water

flood risk




Measures


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level flood

resilience iii) Develop an information

brochure to raise awareness for

residents on how to prepare for

a flood and what to do in the

event of a flood




Measures


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Commentary The LFRMS measures were assessed as having a neutral or positive effect for all SEA objectives. Major positive scores were attributed to all

LFRMS measures for the SEA objectives covering climate change adaptation (i.e. through adapting to flood risk) and the protection of material

assets (such as property and infrastructure). There are also likely to be indirect positive effects on human health, water quality and biodiversity as

a result of the implementation of the LFRMS measures. The positive effects on human health are expected as a result of reduced flood risk,

improved public understanding of flood risk and an improved ability of the public to respond to flooding. The positive effects on water quality

are anticipated due to an expected improvement in Flood Risk Management and as a result the reduced risk of the spread of pollutants from

contaminated sites. Further to this, the increased use of natural drainage systems (SUDS) will further help to improve biodiversity, water quality

and soils (through improved filtration of pollutants) and also provide benefits for amenity, human health and landscape character. Positive effects

on biodiversity are predicted due to an increased level of habitat management, particularly along the coast near Weston-super-Mare, and also the

potential creation of additional habitat areas due to the implementation of SUDS policies.

It was not possible to attribute potential positive or negative effects on many SEA objectives as the measures are ‘high level’ at this stage, hence

there are many neutral scores in the matrix. The headline results for each LFRMS Strategic Objective (SO) are shown below;

SO1 LFRMS Measures

The third measure under SO1 provides for the implementation of protocols for the designation of structures or features which have a significant

impact on local flood risk. The designation of key structures and features will help to reduce the risk of these being altered or removed in such a

way as to impact negatively on FRM. In some cases this could help protect structures and features that are also regarded as cultural heritage

assets, hence the positive score attributed under the cultural heritage SEA objective for this measure.



Measures


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SO2 LFRMS Measures

The second measure under SO2 provides for the development of protocols to control the consenting and enforcement on ordinary watercourses.

These protocols should help to protect the natural hydromorphology of the watercourse, by controlling the volume and type of works undertaken

on land adjacent to the water courses. This measure should help to protect soil resources by protecting Greenfield land, reducing the risk of soil

erosion, maintaining its natural water retention capacity and protecting the vegetation and/or organic debris cover of the soil. It will therefore also

help to protect biodiversity. By protecting watercourses and Greenfield land the amenity value of these resources should also be protected and

opportunities may also arise for it to be enhanced. It is for these reasons that the second measure under SO2 has been given a major positive score

under the hydromorphology SEA objective and a minor positive score under the soils and geology SEA objective.

SO3 LFRMS Measure

All effects on the SEA objectives are expected to be neutral as the measure proposes a continuation of the existing partnership with the SFMB.

SO4 LFRMS Measures

The first measure under SO4 recommends the implementation of policies concerned with the management of the North Somerset coastline near

Weston-super-Mare. If implemented correctly the policy and, as such, the measure, is expected to notably improve biodiversity along the stretch

of coastline, potentially through the protection and enhancement of existing habitats and the creation of new habitat. The management policy is

predicted to help maintain the unique setting and landscape character of North Somerset, therefore also positively impacting upon the cultural

heritage setting and assets of North Somerset indirectly. Measure two is anticipated to have more of a direct impact on the heritage of North

Somerset, hence the major positive score attributed under the cultural heritage SEA objective. The third measure under SO4 provides for the

development of a policy specifically aimed at ensuring that opportunities for the more effective management of surface water in the natural and



Measures


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built environment are recognised and capitalised on in an effective manner. Examples of this include the retrofitting of green infrastructure to

existing assets, the requirement of new assets to achieve a certain level on a ‘green index’ or the protection and enhancement of existing green

spaces. This measure therefore has been predicted to have a minor positive impact on the SEA objectives of biodiversity, landscape character,

water quality, soils, amenity and human health.

SO5 LFRMS Measures

Measures one and two under SO5 are concerned with the development of protocols and guidance which will facilitate the more widespread

consideration and increased effective use of SUDS in the North Somerset area. The introduction of a SUDS Approval Body and local guidance to

inform planning applications should result in an increase in green space and cover, consequently maintaining and potentially enhancing

biodiversity and amenity. One of the primary benefits arising from the implementation of SUDS is an improvement in the quality of surface water

runoff; due to this a major positive impact was attributed for these measures under the SEA objective of water quality. It is also anticipated, given

that SUDS are highly efficient at controlling the volume and rate of surface runoff, that these measures will result in further, albeit minor, positive

impacts for the SEA objectives of hydromorphology and soils.

SO6 LFRMS Measures

These measures are likely to have neutral effects for all SEA objectives, except for the objective for human health, which is predicted to have a

major positive impact. This is mainly due to an anticipated reduction in the fear of flooding through improved availability of information,

knowledge and preparedness of the general public and also the potential for a reduced risk to people from the direct impacts of flooding.


SEA of LFRMS Action Plans

Action Plan: Backwell


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Measures (summarised)

Investigation of dominant surface water

pathways on Farleigh Road into Backwell N N N N N N N N ++ N ++

Investigation into causes of flooding in town

centre and A370 N N N N N N N N ++ N +++

Increase capacity of drainage network N N N N N N N N ++ N +++

Investigation into flood risk for properties in the

north of Backwell N N N N N N N N ++ N ++

Raise awareness with school and hospice owners N N N N N N N N ++ N ++




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Ma

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al

ass

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Am

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Hu

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n h

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h

about flood risks




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Ma

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Am

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Hu

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Cumulative, secondary and synergistic

effects

No cumulative, secondary or synergistic environmental effects have been predicted for flooding or the measures

proposed to reduce flood risk.

Commentary The flood risk measures proposed for Backwell in the short term focus on further investigative study and awareness

raising. This is likely to ultimately result in improved protection of people and properties from flooding, hence there

are major positive impacts predicted for the material assets and human health SEA objectives. For all other SEA

objectives the impacts are expected to be neutral due to the strategic nature of the LFRMS measures at this stage.

Environmental or amenity enhancement

opportunities

In the south of Backwell (Hillside Road) and north (Station Road) urban area there are traditional orchard BAP priority

habitats. To the south-east of the urban area there is some deciduous woodland BAP priority habitat. Backwell is also

close to a Strategic Nature Area of priority woodland habitat with secondary habitats of calcareous grassland and

lowland heath.

The Bucklands Pool/ Backwell Lake Local Nature Reserve is situated between the urban areas of Nailsea and Backwell.

Backwell Lake is also an example of North Somerset BAP ‘open water’ priority habitat. Opportunities to enhance these

sites, particularly the surface water conveyance to Backwell Lake, should be explored with Natural England and Avon

Wildlife Trust.


Action Plan: Churchill


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Hu

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Survey and increase capacity of watercourses N N N N N ? N N ++ N ++

Enhance maintenance of drainage and

watercourses N N N N N N N N ++ N ++

Investigation to watercourse and/or culvert

capacity N N N N N ? N N ++ N ++


Action Plan: Churchill


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Hu

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effects

There is existing cumulative flood risk from surface water, fluvial, highway, sewerage and drainage blocking. Any

management measures are likely to reduce the overall cumulative impacts.

Commentary The flood risk measures proposed for Churchill in the short term focus on further investigative study. This is likely to

ultimately result in improved protection of people and properties from flooding, hence there are major positive

impacts predicted for the material assets and human health SEA objectives. For most other SEA objectives the impacts

are expected to be neutral due to the strategic nature of the LFRMS measures at this stage. Any future measures to

enhance the hydraulic capacity of the watercourse will need to ensure its hydromorphology is protected; hence an

uncertain score is given for the hydromorphology SEA objective for two of the Churchill measures at this strategic

stage.


opportunities

No specific opportunities identified.


Action Plan: Claverham


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Investigation of major flow pathways to south

and east of Claverham N N N N N N N N ++ N ++

Investigation into feasibility of constructing new

ditches to south of Claverham Road N N N N N N N N ++ N ++

Property level protection N N N N N N N N ++ N ++


Action Plan: Claverham


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Hu

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effects

There is existing cumulative flood risk from surface water, fluvial and sewerage sources. Any management measures

are likely to reduce the overall cumulative impacts.

Commentary The flood risk measures proposed for Claverham in the short term focus on further investigative study. This is likely to


impacts predicted for the material assets and human health SEA objectives. For all other SEA objectives the impacts are

expected to be neutral due to the strategic nature of the LFRMS measures at this stage.


opportunities

If it is decided that attenuation basins will be constructed, it may be possible to provide biodiversity or amenity

enhancements, for example through landscaping or planting. Similarly, the construction of new ditches to the south of

Claverham Road and/or new culverts under Claverham Road could also offer small-scale biodiversity enhancement

opportunities.


Action Plan: Clevedon East


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Investigation into flooding in Valley Road,

Carey’s Close and Tickenham Road

N N N N N N N N ++ N ++

Investigation into flooding in Kingston Avenue N N N N N N N N ++ N ++


Action Plan: Clevedon East


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effects

There is existing cumulative flood risk from surface water and other sources. Any management measures are likely to

reduce the overall cumulative impacts.

Commentary The flood risk measures proposed for Clevedon East in the short term focus on further investigative study. This is

likely to ultimately result in improved protection of people and properties from flooding, hence there are major

positive impacts predicted for the material assets and human health SEA objectives. For all other SEA objectives the

impacts are expected to be neutral due to the strategic nature of the LFRMS measures at this stage.


opportunities

There are potential landscape or biodiversity enhancement opportunities on the southern boundaries of Fir Wood and

Court Wood. If there are any surface water pathways that reach Tickenham, Nailsea and Kenn Moors SSSI originating

from the Clevedon east urban area, there may also be opportunities to filter out surface water contaminants through

the use of SUDS.


Action Plan: Congresbury (East)


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Enhance existing maintenance and improve

urban drainage and rhyne/watercourse network N N N N N N N N ++ N ++

Enhancement maintenance of watercourses N N N N N ? N N ++ N ++

Investigation into causes of flooding on High

Street and Station Road N N N N N N N N ++ N ++

Investigation into causes of flooding at properties

near Verlands N N N N N N N N ++ N ++

Raise awareness through the community

resilience group regarding road users and

property flood risk

N N N N N N N N ++ N ++




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effects

There is existing cumulative flood risk from surface water, groundwater, highway, sewerage and drainage blocking.

Any management measures are likely to reduce the overall cumulative impacts.

Commentary The flood risk measures proposed for Congresbury (East) focus, in the short term, on further investigative study and

awareness raising. This is likely to ultimately result in improved protection of people and properties from flooding,

hence there are major positive impacts predicted for the material assets and human health SEA objectives. For most

other SEA objectives the impacts are expected to be neutral due to the strategic nature of the LFRMS measures at this

stage. Any future measures to enhance the drainage capacity of the rhyne/watercourse will need to ensure the natural

hydromorphology of the network is protected; hence an uncertain score is given for the hydromorphology SEA

objective at this strategic stage.


opportunities

There is an area of coastal and floodplain grazing marsh BAP priority habitat to the east and west of Congresbury. This

settlement is also within the project area of the North Somerset Wetland Programme and in close vicinity to two

Strategic Nature Areas of Coastal and Floodplain Grazing Marsh.

There are three SSSIs in the vicinity of Congresbury; rhynes south of Dolemoor Lane (ST 419635) and Congresbury

Yeo, adjacent land and rhynes (ST 4286407). King’s Wood and Urchin Wood SSSI, part of the North Somerset and

Mendip Bats SAC also lies to the east and north of Congresbury.




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Opportunities to enhance the extent or quality of these habitats should be explored with Natural England and Avon

Wildlife Trust. It is important to protect or enhance this ancient broad-leaved woodland.


Action Plan: Hutton


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Increase capacity of urban drainage network N N N N N 1.1.1.10 N N N ++ N ++

Survey of culverted watercourse, working with

highways team

N N N N N 1.1.1.11 N N N 1.1.1.12 ++ 1.1.1.13 N 1.1.1.14 ++


Action Plan: Hutton


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effects


proposed to reduce flood risk. Any management measures are likely to reduce the overall cumulative impacts.

Commentary The flood risk measures proposed for Hutton in the short term focus on further investigative study. This is likely to





opportunities

NSC has recognised that Hutton currently has an insufficient supply of neighbourhood open space, formal park and

public garden, woodland and conservation sites. Any opportunities to improve this provision should be explored.

Hutton is also close to a Strategic Nature Area of woodland priority habitat, which lies to the south.


Action Plan: Langford


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Study into hydraulic capacity of Langford Brook N N N N N ? N N ++ N ++

Investigation into surface water flowing on

Langford Road N N N N N N N N ++ N ++

Increase capacity of drainage network N N N N N N N N ++ N ++


Action Plan: Langford


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effects



Commentary The flood risk measures proposed for Langford in the short term focus on further investigative study. This is likely to




enhance the hydraulic capacity of Langford Brook will need to ensure the natural hydromorphology of this

watercourse is protected; hence an uncertain score is given for the hydromorphology SEA objective at this strategic

stage.


opportunities

No specific opportunities identified.


Action Plan: Long Ashton


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Study into flooding from Long Ashton Brook N N N N N N N N ++ N ++

Enhance maintenance of drainage network N N N N N N N N ++ N ++

Raise awareness of flood risk to Northleaze

Primary School N N N N N N N N ++ N ++


Action Plan: Long Ashton


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effects

There is existing cumulative flood risk from surface water and fluvial sources. Any management measures are likely to


Commentary The flood risk measures proposed for Long Ashton in the short term focus on further investigative study and

awareness raising. This is likely to ultimately result in improved protection of people and properties from flooding,

hence there are major positive impacts predicted for the material assets and human health SEA objectives. For all other

SEA objectives the impacts are expected to be neutral due to the strategic nature of the LFRMS measures at this stage.


opportunities

Long Ashton is within a Strategic Nature Area with primary woodland habitat and secondary habitats of calcareous

and neutral grassland.


Action Plan: Nailsea


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Improved maintenance of gullies N N N N N N N N ++ N ++

Study into surface water flooding and

funding/initiating a Surface Water Management

Plan

N N N N N N N N ++ N ++

Survey, including CCTV of historic watercourses N N N N N N N N ++ N ++




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effects

There is existing cumulative flood risk from surface water, fluvial, highway and sewerage sources. Any management

measures are likely to reduce the overall cumulative impacts.

Commentary The flood risk measures proposed for Nailsea in the short term focus on further investigative study, including the

recommendation for a Surface Water Management Plan to be undertaken. This is likely to ultimately result in

improved protection of people and properties from flooding, hence there are major positive impacts predicted for the

material assets and human health SEA objectives. For all other SEA objectives the impacts are expected to be neutral

due to the strategic nature of the LFRMS measures at this stage.


opportunities

Consultation with North Somerset Council has shown there are several locations in the district that would benefit from

improved pollution control. This includes Tickenham Causeway, as the ditch which conveys the majority of surface

water from Nailsea to Tickenham, Nailsea and Kenn Moors SSSI (ST 444705) has high levels of phosphates and organic

pollutants; any improvement to the quality of this surface water through LFRMS schemes is likely to lead to

biodiversity benefits for the SSSI, particularly for invertebrate species.

Other SSSIs in the vicinity of Nailsea include West End Meadows (ST 458691), Fields along Youngwood Lane (ST

467695), Batch Farm Meadow (ST 450692) and Nursebatch Farm Fields (ST 453691).

Nailsea is close to the Strategic Nature Area of Nailsea Moor, a priority habitat of Coastal and Floodplain Grazing




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Marsh.

NSC has recognised that the urban area of Nailsea currently has an insufficient supply of woodland and conservation

sites. Any opportunities to improve this provision or enhance designated sites or other habitats should be explored.


Action Plan: Pill


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Investigation into Pill pumping station by

Environment Agency and NSC N N N N N N N N ++ N ++

Investigation into 2012 flooding incidents N N N N N N N N ++ N ++

Survey of ordinary watercourse in Pill N N N N N N N N ++ N ++


Action Plan: Pill


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effects

There is existing cumulative flood risk from surface water and fluvial sources. Any management measures are likely to


Commentary The flood risk measures proposed for Pill in the short term focus on further investigative study and survey. This is

likely to ultimately result in improved protection of people and properties from flooding, hence there are major

positive impacts predicted for the material assets and human health SEA objectives. For all other SEA objectives the

impacts are expected to be neutral due to the strategic nature of the LFRMS measures at this stage.


opportunities

Priory Farm and Pill Paddock Local Nature Reserves are both close to Pill. NSC has recognised that Pill currently has

an insufficient supply of woodland, formal park and public garden and conservation sites. Any opportunities to

improve this provision should be explored.

Pill lies within a strategic area of coastal habitat shown on the Strategic Nature Area map of the south west.

Opportunities to enhance the biodiversity, wildlife corridors, amenity or access to the Local Nature Reserves or other

habitats should be explored.


Action Plan: Portbury


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Intercept and divert pluvial runoff N N N N N 1.1.1.15 N N N ++ N ++


Action Plan: Portbury


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effects

There is existing cumulative flood risk from surface water and highway drainage sources. Any management measures

are likely to reduce the overall cumulative impacts.

Commentary The flood risk measure proposed for Portbury in the short term includes different options to intercept and divert

pluvial runoff. This is likely to ultimately result in improved protection of people and properties from flooding, hence

there are major positive impacts predicted for the material assets and human health SEA objectives. For all other SEA

objectives the impacts are expected to be neutral due to the strategic nature of the LFRMS measures at this stage.


opportunities

Portbury Wharf, Prior’s Wood and Priory Farm Local Nature Reserves are all close to Portbury. There are also various

SSSIs locally, listed in the Environmental Report.

Portbury is within a Strategic Nature Area, with primary woodland habitat and secondary habitats of calcareous and

neutral grassland.

Opportunities to enhance the biodiversity, wildlife corridors, amenity or access to the Local Nature Reserves or SSSIs

should be explored.


Action Plan: Weston


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Study: completion of SWMP for town and

Weston Development Area N N N N N N N N ++ N ++

Raise awareness of flooding to owners of

infrastructure at risk of flooding N N N N N N N N ++ N ++


Action Plan: Weston


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effects



Commentary The flood risk measures proposed for Weston in the short term focus on further investigative study. This is likely to





opportunities

The Weston Woods Local Nature Reserve lies to the north of the urban area. Ellenborough Park West SSSI is close to

the seafront in central Weston and Uphill Cliff SSSI/ LNR, Purn Hill and Bleadon Hill SSSIs all lie to the south of the

urban area. The SWMP will be able to identify if there are likely to be any flood risk measures required in the vicinity

of these schemes and, if so, whether any mitigation or enhancement is required. Weston is also within the project area

of the North Somerset Wetland Programme so there may be opportunities to improve wetland habitats in the Weston

area.


Action Plan: Winscombe


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Culvert capacity assessment study N N N N N ? N N ++ N ++

Survey of culverts, including CCTV N N N N N N N N ++ N ++

Study into the standard of protection provided

by natural flood defences near the junction of

Church Road/ Barton Road

N N N N N N N N ++ N ++

Investigation into presence and location of

existing culverts N N N N N N N N ++ N ++

Improve drainage network or enhance

maintenance

N N N N N N N N ++ N ++


Action Plan: Winscombe


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effects



Commentary The flood risk measures proposed for Winscombe in the short term focus on further investigative study. This is likely

to ultimately result in improved protection of people and properties from flooding, hence there are major positive



enhance the hydraulic capacity of culverts will need to ensure the natural hydromorphology of this watercourse is

protected; hence an uncertain score is given for the hydromorphology SEA objective at this strategic stage.


opportunities

Cheddar Valley Railway Walk is a linear Local Nature Reserve lying to the west of Winscombe. The Mendip Hills

AONB and some deciduous woodland BAP priority habitat also lie to the west of the urban area. The LNR is in close

proximity to ‘The Lynch and The Green’, areas where there are known highway drainage issues. NSC has recognised

that Winscombe currently has an insufficient supply of neighbourhood open space. Opportunities to enhance the LNR,

BAP priority habitat or neighbourhood open space should be explored with Natural England and Avon Wildlife Trust.


Action Plan: Wrington


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Study into options available to mitigate flooding

from ordinary watercourse, including;

• Storage upstream of Wrington; and

• Up-sizing of the watercourse at critical

points

N N N N N ? N N ++ N ++

Study to;

• investigate the route of any

watercourses or ditches to the north of

Wrington;

• confirm the capacity and condition of

watercourses, ditches and culverts; and

• investigate the sufficiency of highway

and sewer networks to drain surface

runoff

N N N N N N 1.1.1.18 N N ++ 1.1.1.19 N ++




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Liaison with local residents to confirm the

flooding mechanism predicted on School Road,

Broad Street and Roper’s Lane




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effects



Commentary The flood risk measures proposed for Wrington in the short term focus on further investigative study. This is likely to




enhance the hydraulic capacity of Wrington’s ordinary watercourse will need to ensure the natural hydromorphology

of this watercourse is protected; hence an uncertain score is given for the hydromorphology SEA objective at this

strategic stage.


opportunities

There are traditional orchard and deciduous woodland BAP priority habitats in the ‘Alburys’/High Street area in the

north of Wrington. There are also larger areas of both these BAP habitats to the north of the urban area.

Wrington contains examples of ‘ancient and/or species-rich hedgerows’, which are listed in the North Somerset BAP as

being good examples of ‘boundary and linear features’ priority habitat.

Wrington is close to a Strategic Nature Area with woodland priority habitat and secondary habitats of calcareous




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grassland and lowland heath.

NSC has recognised that Wrington currently has an insufficient supply of neighbourhood open space, woodland,

conservation sites and formal parks or public gardens. Any opportunities to improve this provision or enhance the

LNR or BAP priority habitat should be explored with Natural England and Avon Wildlife Trust.

If it is decided that upstream storage options will be constructed, it may be possible to provide biodiversity or amenity

enhancements, for example through landscaping or planting.

appendix d - assessment matrices nsc lfrms sea - np...

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