Download Appendix 9.4 Water Vole Mitigation Strategy - Stratford-on

Energy, Env
vironment & Design
L
Marston Estate, Long Marston
M
, Warwiickshire
e
The Long
n and Enhancement Sttrategy
Wate
er Vole Mitigatio
M
April 200
09
Energy, Env
vironment & Design
L
Marston Estate, Long Marston
M
, Warwiickshire
e
The Long
Waterr Vole Mittigation and
a Enha
ancemen
nt Strateg
gy
Client Name:
N
Referen
nce:
Issue:
St Modwen
M
Deve
elopments Limited
E301
16-C-12-3-1
Third
d Issue
Q
Quality
Assuran
nce – Approva
al Status
Th
his document has bee
en Prepared and che
ecked in accordance with
Wa
aterman EED’s IMS (BS EN ISO 9001: 2000 and BS EN ISO 14001: 2004)
Prrepared by: Ce
eri Griffiths
Po
osition:
Ecology Consultan
nt
Checked by: Ra
achel White
osition:
PA
A
Po
Ap
pproved by: Julian Arthur
Po
osition:
Technical Directorr
Akeman Barns,
B
Coln St
S Aldwyns, Cirrencester, Glo
oucestershire GL7 5AW
t. 01285 750555
7
f. 012
285 750636 e.
e [email protected] w. www.wattermangroup.c
com
Energy, Env
vironment & Design
Energy, Environment & Design
CONTENTS
1.
Introduction........................................................................................................ 1
2.
Water Vole Survey Findings .............................................................................. 3
3.
Potential Impacts ............................................................................................... 5
4.
Mitigation Strategy............................................................................................. 6
5.
Summary of Impacts Resulting from, and Mitigating for the Proposed
Development of the Site.....................................................................................10
6.
References ........................................................................................................ 11
Appendix
Appendix 1:
Block Layout
Plans
Habitat Features
(3016/05c April 2009 JA/TB)
Water vole mitigation strategy
(3016/15a April 2009 JA/TB)
Energy, Environment & Design
Energy, Environment & Design
1. INTRODUCTION
1.1
This report has been prepared by Waterman Energy, Environment and Design (Waterman EED) on
behalf of St. Modwen Developments Ltd. It sets out the principles of a mitigation and
enhancement strategy for water voles at the Former Central Engineer’s Depot, Long Marston,
Warwickshire (hereafter referred to as the ‘Site’) to prevent or minimise adverse impacts on water
voles (including loss of habitats on which they depend), which could arise from proposed
redevelopment of the Site. This report will form an appendix to an Environmental Statement to be
submitted in support of an application.
Relevant Legislation and Policy
1.2
Water vole Arvicola terrestris receives full protection under the Wildlife and Countryside Act (WCA)
1981 (as amended). The protection makes it an offence inter alia to:
•
Damage, destroy, or obstruct access to a structure or place which is used by water voles for
shelter or protection;
•
Disturb a water vole whilst it is occupying such a structure or place which it is using for that
purpose;
•
Intentionally kill, injure or take a water vole; or
•
Have in one's possession or control any live or dead water vole or derivatives.
1.3
Water voles are a UK Biodiversity Action Plan (UK BAP) and Warwickshire BAP species. Water
voles are also a Species of Principal Importance (SoPI), which, in accordance with Section 41(2) of
the Natural Environment and Rural Communities Act 2006, requires authorities to further their
conservation.
1.4
Once common and widespread in lowland England, the water vole has suffered an accelerating
decline in numbers and distribution throughout the last century.
1.5
The most recent national survey, completed in 1998, showed a 67.5% loss in occupied sites and
an 88% decline in population in only seven years.
1.6
The Warwickshire, Coventry and Solihull Local BAP (LBAP) states that, “save for fragmented
colonies in the Coventry/Nuneaton area … with the exception of a couple of isolated
colonies recorded elsewhere, the water vole appears to have all but disappeared from the
rest of the county.” That said, data searches revealed a number of water vole records from close
to the Site boundary.
1.7
In addition, planning policy through the government’s Planning Policy Statement 9 (PPS9) requires
that adverse effects of development on SoPI should be avoided through planning conditions or
obligations and that planning permission should be refused where harm to these species, or their
habitats, may result, unless the need for, and benefits of, the development clearly outweigh the
harm.
1.8
There is no provision for licensing the intentional destruction of places of shelter (e.g. burrows)
used by water voles or intentionally taking or having a water vole in one’s possession during
maintenance or development works.
1.9
More locally, Policy EF7A of the Stratford-on-Avon District Local Plan (1996 – 2011) protects rare,
endangered or other wildlife species of conservation importance. Development will not be
permitted unless suitable mitigation or compensatory measures are secured.
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Energy, Environment & Design
Background and Scope of Report
1.10 Detailed ecological surveys of the Site undertaken by Waterman Group in 2008 have confirmed the
presence of water voles in a number of ditches. The full details of the survey are provided in
subsequent sections of this report. Further to consultation with the selection panel for Sites of
Interest for Nature Conservation (SINC) in Warwickshire, it has been confirmed that the water vole
population and the ditch network that supports them, would qualify parts of the Site as a SINC
(under the species criterion where the presence of a “significant population” of a species that is
rare in the county has been confirmed (ref. 1)). At the time of writing, the exact boundaries of the
SINC had yet to be defined.
1.11 As agreed with the county ecologist (Anna Swift, Warwickshire Museum), in the absence of the
SINC boundary this strategy is in accordance with relevant planning policy and legislation, and has
been based on the requirements of water voles, as would be required once the SINC boundary is
defined.
1.12 Given the conservation status of water voles both locally and nationally, and the legal and policy
protection afforded to the species, the requirements of the species have played a key role in the
design of the proposed development. This report sets out the strategy to avoid adverse effects
during construction and to ensure that the water vole population can be maintained and enhanced
in the long term within the proposed development.
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Energy, Environment & Design
2
WATER VOLE SURVEY FINDINGS
Summary of Survey Methodology
2.1
The water vole survey was undertaken in 2008 on 26 August, and 23 and 30 September by
experienced ecologists. The survey followed standard best practice techniques (Ref. 2), which
involved walking the length of the watercourses within the Site boundary looking for characteristic
signs of water vole activity.
2.2
A predictive equation that describes the relationship between water vole numbers and latrines was
used to estimate the water vole population size: y = 1.48 + 0.683x (where y = water vole numbers
and x = number of latrines). This provides an estimate of population numbers; however, it cannot
be used as a precise numerical estimate (ref. 2).
Habitat Assessment
2.3
The ditches within the Site form part of the surface water drainage system; their location is shown
on Plan 3016/05c. The majority have negligible flow, steeply shelving banks, and an average
depth of 3-5cm with a silty substrate.
2.4
The ditch flora is limited to a few common and widespread plant species consisting predominantly
of terrestrial species established on the banks. The structural uniformity and general lack of microhabitat in the ditches, together with their intensive management as part of the ground maintenance
programme at the Site limits their ecological value further. Submerged vegetation was not
recorded in any of the ditches. Stands of emergent vegetation were also relatively infrequent. The
ditch vegetation was typically dominated by common and widespread terrestrial species growing on
the banks such as hogweed Heracleum sphondyleum, common nettle Urtica dioica, lesser burdock
Arctium minus and great willowherb Epilobium hirsutum. The most frequent macrophyte (wetland
or aquatic plant) was reedmace Typha latifolia, with occasional associates such as fool’s
watercress Apium nodiflorum, water plantain Alisma plantago-aquatica and yellow flag Iris
pseudacorus. Other moisture loving bankside species included meadowsweet Filipendula ulmaria,
tufted hair-grass Deschampsia caespitosa and water figwort Scrophularia auriculata.
2.5
The habitat that surrounds the majority of the ditches is heavily managed grassland with a low
sward height. Ditches F and G run through woodland.
2.6
Pond P1 is large and partially surrounded by willow trees and scrub. Emergent vegetation at the
pond margins includes reed sweet grass, common reedmace, purple loosestrife Lythum salicaria
and common reed. Submerged vegetation includes common water-plantain Alisma plantagoaquatica and a species of pondweed that could not be sampled for identification purposes, possibly
Canadian pondweed Elodea canadensis and water-lily Nymphaea sp..
Water Vole Status at the Site
2.7
The findings of the water vole survey are summarised in Table 1 below.
Ditch
Burrows
Latrines
Feeding Stations
B&E
6
6
8
C&D
F
G
H
M&L
N
Pond P1
1
5
6
4
11
14
4
0
2
3
2
11
4
0
1
13
16
7
47
2
2
Runs
4
Numerous
Numerous
Table 1: Summary of 2008 Water Vole Results
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Energy, Environment & Design
2.8
Evidence of water voles was found within all the ditches with the exception of A, I, J, K, O and P
(refer to Plan 3016/05c). These are either concrete lined and do not provide suitable burrowing
habitat, or the ditches dried out over the course of the survey and so are unsuitable. Pond P1 was
also found to support water voles.
2.9
Ditches B, E and L showed the highest level of water vole activity. Using the population estimate
equation it is estimated that there could be 34 water voles using the ditches and ponds on the site,
which is considered to be a relatively small population.
2.10 Two sightings of mink Mustela vison were recorded on the Site. These were near ditch M and ditch
N. Mink prey heavily on water vole and can quickly decimate a water vole population.
2.11 In summary, it is evident that water voles use most of the suitable aquatic and riparian habitat
within the Site, however, with the evidence of mink recorded it is not known how long the
population will remain. Although water voles had been recorded within the vicinity of the Site, it is
now likely that these populations are extinct, owing to such predation (pers. comm. Anna Swift,
Warwickshire Museum).
2.12 On the basis of the survey findings and the conservation status of the species locally and in the
county, the water vole population was deemed to be of sufficient value to satisfy the criteria for
SINC selection in Warwickshire (see paragraph 1.10 above). The population of water vole is
therefore considered to be of county value. However, in the absence of mink control it seems
likely that the value of this population will decline.
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Energy, Environment & Design
3
POTENTIAL IMPACTS
Construction Impacts
3.1
There is potential for water voles to be affected during the construction phase, although, impacts
would be largely avoided through masterplan design by retaining and where possible improving the
ditch network to allow movement between existing ditches (and avoid fragmentation of the
population), and with protective buffers between new development and sensitive bankside habitats
supporting the water vole burrow networks. However, ditch N and Pond P1 will be directly affected
during construction works.
3.2
Pond P1 is to be retained and increased in area as part of the flood storage strategy. This would
affect existing pond banks used by water vole, including burrows, although as described below, the
works will result in the creation of extensive new habitat for the species. A new wet ditch
connecting Pond P1 to the existing drain network (also required as part of the flood control
strategy) would improve habitat connections for water voles. New Sustainable Urban Drainage
System (SUDS) are proposed alongside ditch N within the proposed residential development. The
SUDS would comprise swales that would alternate surface water drainage; they would be dry for
the majority of the time. There is the potential for water voles and their burrows to be impacted
during construction of the swales. In the absence of mitigation, such an adverse effect upon the
water vole population at Pond P1 would be of moderate significance. Impacts would also trigger
the legislation protecting water voles and their habitat. However, the impact would be temporary
and would only affect a small proportion of the habitat used by water voles. As stated later, the
new habitats created and improved connectivity should assist with the mitigation.
3.3
The proposed works may result in short-term noise and vibration and this may result in disturbance
to water voles. There could also be accidental incursion by machinery into other habitats known to
support water vole, or polluting materials such as silt or chemicals resulting in degradation of water
quality. These impacts could result in an impact upon the water vole population, although any
impact would be expected to be temporary, very localised and hence significant at a local level only
and therefore of minor significance.
Completed Development
3.4
The Proposed Development will increase the number of people and domestic pets in the eastern
part of the Application Site, particularly the south-east corner where residential development is
proposed (see Appendix 1). A new footpath is also intended adjacent to ditch N, although this will
be at least 6m from the bank for most of its length, thereby minimising potential direct effects to
water vole burrows. There is likely to be a resultant increase in human disturbance from noise,
litter and the potential predation of water voles by domestic pets.
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Energy, Environment & Design
4
MITIGATION STRATEGY
Overview
4.1
The mitigation strategy comprises the following elements:
Construction Phase
•
Design to avoid sensitive water vole habitat, including where burrows and tunnels are
present or likely to be present;
•
Enhancement of existing ditch habitats through restoration and management, and increase
habitat available, through wetland creation;
•
Improve the linkages between ditches and Pond P1 to improve the permeability of the Site
for water voles; and
•
During construction, timing of works and temporary exclusion to avoid excessive disturbance
or mortality.
Completed Development Phase
4.2
•
A management plan designed to maintain the water courses in a favourable condition for
water voles; and
•
Within the development raise awareness of the presence of, and potential threats to, the
water vole population from disturbance and predation by domestic pets.
Elements of the mitigation strategy are illustrated on Plan 3016/15a and described in more detail
below. The strategy is in accordance with the approach set out in the Water Vole Conservation
Handbook (ref. 2).
Construction Phase
Design Strategy
4.3
Water vole burrows can be found along the water’s edge or within the vegetation 3m from the
water’s edge on a bank. The burrows can extend up to 5m into the bank (ref.2; p.89). Therefore,
any works within 5m of the ditch banks could potentially impact on water voles or their resting
places, resulting in an offence.
4.4
For this reason, the development has wherever possible retained a buffer of 6m between the
development edge and ditches known to support the species (see Plan 3016/15a). As stated in
the Water Vole Conservation Handbook (P.64) a 6m wide vegetated margin either side of a ditch
will provide extensive foraging opportunities for water voles.
4.5
The proposed footpath adjacent to ditch N will be designed so as to be outside the 6m buffer
except in discrete locations where the path will be closer to the banks to create viewpoints to the
ditch. This will provide both educational value but also natural surveillance of the ditch so that
issues such as littering are minimised.
4.6
Furthermore, houses rather than residential gardens will face on the buffers adjacent to ditches,
minimising the risk of garden waste and litter entering the ditch network. Where this is not possible
a fence would be installed at the boundary of the buffer zone.
4.7
As part of the SUDS strategy, swales within the residential development (refer to Plan 3016/15a)
will be constructed and these will wherever possible be positioned 6m from the bank edge to avoid
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Energy, Environment & Design
water vole burrows. Where this is not possible, swales will be located away from burrows so that
impacts are avoided.
Enhancement and Creation of New Water Vole Habitat
4.8
In recognition of the importance of the water vole population, as part of the development
opportunities have been taken to increase the amount of suitable water vole habitat, in the form of
vegetated earth banks. Table 2 below summaries the amount of existing water vole habitat and
that which is to be enhanced or created through the development - this is illustrated in Plan
3016/15a.
Length of
existing
suitable
bankside
habitati
Length of new
bankside habitat
associated with
extension to Pond
P1
Length of
ditches to
be deculverted
Length of
existing
concrete lined
ditches to be
restoredii
Total length of
bankside habitat
available in
proposed
development (%
increase over
existing)
4,710m
292m
419m
457m
5,878m (25%)
i Suitable bankside habitat comprises that which is predominantly wet and has earth banks suitable for water vole
burrowing.
ii restoration involves breaking out concrete to create earth banks suited to water vole burrowing.
Table 2: Summary of Water Vole Habitat Enhancement and Creation
4.9
Pond P1 is to be enlarged with additional bankside habitat created. The banks will be of earth with
sloping profiles to encourage marginal habitat and a steeper or stepped profile on the upper half of
the bank to provide suitable burrowing habitat. An island would be created to increase foraging
and burrowing habitat available for the water voles (this will also benefit other wildlife such as
waterfowl). A reedbed would also be included to provide cover from predators such as mink.
4.10 An existing culverted ditch (parts of ditches N and A) is to be opened up (‘de-culverted’). Concrete
will be broken out to expose natural earth and the banks will be re-profiled as shown in Figure 1
(reproduced from ref. 2) to create 419m of new water vole habitat. Similarly, other existing
concrete lined ditches will be enhanced by removing the concrete, increasing suitable water vole
habitat by 457m. Appropriate vegetation will be planted on the banks to provide additional foraging
and protection (ref. 2; Box 5.B Pg 61).
Figure 1: Ditch Showing the Profile and Vegetation Suitable for Supporting Water Vole
Maintain Linkages
4.11 In the absence of mitigation or appropriate design, fragmentation of the existing population by
isolating parts of the existing ditch network could result in the extinction of the population of water
voles at the Site. However, the connectivity between ditches within the Site is maintained within
the development design and to off-site ditches/watercourses. Indeed, with the new connecting
ditch proposed between Pond P1 and ditch A, and the de-culverting of ditch N-A, the existing
connectivity should be improved. Wide 6m buffers adjacent to the ditches will provide cover
alongside ditches where these are within those parts of the Site that are subject to higher density
development (see block layout in Appendix 1).
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Energy, Environment & Design
Precautions During Construction
4.12 Some existing water vole habitat at Pond P1 is to be affected. The level of water vole activity
identified during surveys was low, indicating a low population. Nevertheless, there is the possibility
of the works having a direct impact on water voles and their burrows. Due to the short term nature
of the impact, it is proposed that the water voles are temporarily displaced from the affected areas
of the pond to the opposite banks that will be unaffected by the works. As described above, the
amount of habitat available, and connectivity to other suitable habitat, will be increased or
improved, respectively, as a result of the development.
4.13 The least disruptive time of year to undertake works on water vole habitat is late February to April,
when the species is active but not breeding. The proposed methodology is described below:
•
To minimise the impact on the pond and water vole habitat, contractors will be made aware
of the presence of water voles. All works below would be supervised by an ecologist;
•
Before the work is undertaken, a check will be made by an ecologist for any water vole
burrows in the banks. These will be marked so that they can be checked later to ensure that
they are not obstructed;
•
All vegetation will be removed from the section of the pond that is to be extended and an
additional 5m buffer zone either side;
•
If any burrows are located along the affected section, these will be rechecked to ensure that
they are not blocked;
•
Once the strimming has been completed, a destructive search using only hand tools will be
undertaken within three days prior to the works commencing to excavate burrows and root
systems to ensure that there are no water voles present within the strimmed areas;
•
A plywood fence will be installed at either side of the mitigation area to prevent water voles
returning. It may be that fencing off sections in phases and then excavating the pond
extension in discrete sections is the most straightforward way of completing works, but this
will be subject to prior agreement with the contractor; and
•
Once construction has been completed, the banks will be planted with a mix of suitable,
native species and allowed to regenerate. Species would be chosen from the recommended
list in the Water Vole Conservation Handbook (ref. 2).
4.14 If any of the other ditches supporting water voles are to be affected, through new road crossings,
for instance, then the methodology above would be adopted to reduce the potential impacts on
water voles.
4.15 There is the potential for indirect effects to retained ditches that are not proposed to be directly
affected through pollution of disturbance during construction. To avoid this, ditches will be fenced
6m from the ditch banks and Environment Agency best practice guidance during construction
followed. Where SUDS are to be created adjacent to ditch N, working areas will be similarly fenced
so that impacts to water voles and their burrows are avoided.
Completed Development
Long-Term Management
4.16 In order to maximise the potential of the new and retained habitat for water vole, a management
strategy will be adopted, the details of which would be set out in an Ecological Management Plan
(EcMP) for the Site (refer to Appendix 9.5 of the Environmental Statement). This could be secured
by planning controls.
4.17 The objectives of management will be to maintain and improve the conservation status of the water
vole population. The management prescriptions for water voles will include:
The Long Marston Estate, Long Marston, Warwickshire
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Energy, Environment & Design
•
Aftercare of newly planted vegetation on ditch and pond banks to ensure successful
establishment, whilst avoiding dominance of competitive or invasive species;
•
More sympathetic management of bankside vegetation, with mowing undertaken in late
summer (mid-July to September) only, and vegetation cut no lower than 15cm. Only one
side of the ditch should be cut in one year, alternating each year. Alternatively, the
vegetation would be cut at intervals along both sides so that some of the vegetation remains
uncut thereby retaining cover and foraging habitat;
•
The ditches that run through the woodland would be enhanced by the removal of some of
the overhanging trees to increase light penetration to the ditches and increase the coverage
of grassland along the banks;
•
One of the greatest threats to the population is predation from mink. If possible, a mink
control programme will be devised with the intention that it would be implemented by local
volunteer groups. Control would include active trapping of mink along ditches; and
•
A water vole monitoring strategy will be implemented. This will firstly require baseline
surveys to be undertaken pre and post construction. If water vole densities are found to be
low, a review of the mitigation strategy and management plan for the site should be
undertaken in conjunction with the statutory bodies to determine if any other could be
implemented to enhance the site for water voles such as a mink control programme.
Raise Awareness
4.18 Signage will be erected and leaflets provided to inform residents of the importance of the
population, and its vulnerability to predation by domestic cats and mink. The latter will, together
with managed buffers adjacent to ditches, help to minimise predation impacts from domestic pets.
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Energy, Environment & Design
5
SUMMARY OF IMPACTS RESULTING FROM, AND
MITIGATING FOR THE PROPOSED DEVELOPMENT OF
THE SITE
5.1
Table 3 below summarises impacts and mitigation proposed to address them. It follows the
approach set out in the Water Vole Conservation Handbook (ref. 2; Box 9:G, p. 106).
Works
Extent
Magnitude
Duration
Reversibility
Timing/frequency
Cumulative effects
Beneficial effects
Mitigation
The works will result in some temporary habitat loss and modification.
Footprint of works on ditch N equates to approximately 550m in length of
water vole habitat, with either 1 or 2 female territories affected.
Habitat loss around Pond P1 will equate to approximately 200m of water
vole habitat, which is likely to support 1 or 2 female territories.
Direct impact on one or more individual animals under the footprint of
the scheme during works, potentially including: minor short-term loss of
habitat and disturbance to individuals during the works.
Works (including mitigation and development) are likely to take several
years, although the ditches and ponds will be affected to a lesser extent
and should be completed in several weeks. Restoration may take up to
12 months on newly created ditches and ponds.
Habitat loss is fully reversible and more than compensated.
Impact can be reduced by timing of works between late February to
April. The habitat will only be affected during the works.
Low probability of cumulative effects as no other developments are
known nearby that could affect the population.
Appropriate restoration of the ditches and ponds, habitat creation,
management and mink control will have a long-term beneficial effect to
the water vole population on the Site. There will be an increase in
overall water vole habitat on the site and better dispersal route around
the Site and to habitat beyond.
The mitigation set out in this report will enable the works to be
conducted without any long-term adverse impacts to the water vole
population.
Table 3: Summary of Impacts and Mitigation
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Energy, Environment & Design
6
REFERENCES
6.1
Warwickshire Wildlife Trust, 1997. The Selection of Sites of Importance for Nature Conservation in
Warwickshire. Warwickshire Wildlife Trust, Coventry.
6.2
Strachan, R. (2006) Water Vole Conservation Handbook.
Emley, D.W. (Ed) (2007).
The Long Marston Estate, Long Marston, Warwickshire
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Second Edition. Wild Cru, Oxford.
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Energy, Environment & Design
Appendix
Appendix 1:
Block Layout
Energy, Environment & Design
Energy, Environment & Design
Plans
Habitat Features
(3016/05c April 2009 JA/TB)
Water vole mitigation strategy
(3016/15a April 2009 JA/TB)
Energy, Environment & Design
W1
I
K
i
J
Site boundary
SI
I
Mixed planted woodland
H
SI
I
Scattered shrub and trees
G2
W14
B W15
W2
G2
Amenity grassland
C
I
W13
E
SI
L
D
SI G1
W12
Improved grassland
SI
Species rich semi-improved grassland
SI
Semi-improved grassland
I
G3
SI
W11
A
M
I
W7
W9
Marshy grassland
W16
A
W10
P
Q
Tall ruderal
O
F
X
Ephemeral
F
Ditch (wet) and label
I
W8
G
W5
W3
A
Pond
Honeybourne
Railway Line
I
W6
I
W4
A
N
W17
Arable
Bare ground
A
Buildings and hard standing
W18
I
I
N
I
0
I
I
I
500m
I
W19
Project Details
Long Marston Estate, Long Marston, Warwickshire
Title
Habitat Features
Scale
As shown (approximate)
Drawing Ref
3016/05c
Date
April 2009
Checked
JA/TB
www.watermangroup.com
© WATERMAN ENERGY, ENVIRONMENT & DESIGN
Reproduced from the Ordnance Survey maps with the permission of the Controller of Her Majesty’s Stationery Office,© Crown copyright, Waterman Energy, Environment & Design Akeman Barns, Coln St Aldwyns, Cirencester, Gloucestershire GL7 5AW: Licence number 100012765.
Energy, Environment & Design
Section A - A - drain within
residential
6m
Minimum 6m
distance
new
foot path
dista
an
nce
nc
e from
fr
n
Enlarged Plan View
for A - A
Public
viewing area
C
C
New Footpath
development
edge
Tall marginal
vegetation
bankside vegetation managed to screen disturbance
whilst providing diverse food source
Secctiio
Section
ion
n B - B - new
drain
d
dra
a n profile
ain
Minimum 6m
Stand off
Sec
Sect
ecct
cctition
on C - C
Section
reed
db
d
b
be
ed
ed provides
prov
pr
ovid
ides
es
reedbed
ref
uge
ug
ge from
ffrro
om m
mi
in
nkk
refuge
mink
M
anag
a
ge
g
e water levels
leve
Manage
to
o benefit water
wa
voles
vole
B
B
Island
provides
Is
sslan
nd pro
pr
p
ovides additional
o
add
banks
ba
b
a k for
f r burrowing and
foraging
45 banks
ban
an
nkkks
s
45
A
A
Site boundary
existing drains to be
managed for water vole
Proposed develpment
minimum of 6m from
ditch
existing culvert removed
creating new habitat
Concrete lined ditches
removed & re-worked
providing additional
habitat
New pond providing
additional habitat a
reedbed refuges from
mink
Dispersal routes for emigration/immigration to
offsite ditch networks
N
0
Project Details
Long Marston Estate, Long Marston,Warwickshire
Title
Water vole mitigation strategy
Scale
As shown (approximate)
Drawing Ref
3016/15a
Date
April 2009
Checked
JA/TB
200m
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