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2.0 Aims and Objectives - Borough of Burnley 0446 Flood... · 2013-12-03 · 2.0 Aims and...
Transcript of 2.0 Aims and Objectives - Borough of Burnley 0446 Flood... · 2013-12-03 · 2.0 Aims and...
Site Specific Flood Risk Assessment
Proposed Industrial Units, Empire Business Park, Enterprise Way, Burnley BB12 6LT
DG-A Ltd Page 1 of 15 November 2013
1.0 Introduction
1.1 This flood study report is to accompany a planning application to Burnley Borough Council
for the construction of a new Industrial Unit at Empire Business Park, Enterprise Way, off
Liverpool Road, Burnley BB12 6LT. The map reference for the site is :- SD 81153 432646.
The area of the site is approximately 5.22 hectares
2.0 Aims and Objectives 2.1 There are three aims and one objective of the report. The details of which are set out below. 2.2 Appraisal of the risk
2.2.1 It is proposed to identify land and property which could be at risk and the degree of risk of
flooding from river, sea and other sources in the area.
2.3 Managing the Risk
2.3.1 To comment and advise as to the design of the development so as to avoid flood risk to
people and property and, where possible, manage any residual flooding risk on the proposals,
taking account of the impacts of climatic change.
2.4 Reduction of the Risk
2.4.1 Suggestions will be made to reducing flood risk, if any, and to and from new development
through location, layout and design, possibly incorporating sustainable urban drainage
systems i.e. (SUDS)
2.5 Methodology
2.5.1 This report’s objective is to follow the procedures set out in The Communities and Local
Government Department: Technical Guidance to the National Planning Policy Framework
(March 2012), on development in areas at risk of flooding and accordingly produce a Flood
Risk Assessment specifically for this site. Further information has been obtained from the
Environment Agency, the Lead Local Flood Authority and United Utilities.
Site Specific Flood Risk Assessment
Proposed Industrial Units, Empire Business Park, Enterprise Way, Burnley BB12 6LT
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3.0 The Site
3.1 The site is close to Burnley Town Centre and its bus links and is also close to Junction 9 off
the M65 Motorway.
Fig. I - Location Plan
Fig. II - Site Plan
Site Specific Flood Risk Assessment
Proposed Industrial Units, Empire Business Park, Enterprise Way, Burnley BB12 6LT
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Fig. III – Aerial Photograph
4.0 Proposals
Fig. IV - Development Proposals
Site Specific Flood Risk Assessment
Proposed Industrial Units, Empire Business Park, Enterprise Way, Burnley BB12 6LT
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5.0 History of the Site
5.1 The first edition of 1:2500 maps (surveyed in 1884-92 and published in 1891-94, show an
area of farmland. For clarity, the approximate location of the proposed Industrial Unit is
shown in red.
Fig. V – c1891-94 Plan
6.0 Responsibilities of the Owner/Developer 6.1 Landowners have the primary responsibility for safeguarding their land and other property
against natural hazards such as flooding. Individual property owners and users are also
responsible for managing the drainage of their land in such a way as to prevent, as far as is
reasonably practicable, adverse impacts on neighbouring land.
Site Specific Flood Risk Assessment
Proposed Industrial Units, Empire Business Park, Enterprise Way, Burnley BB12 6LT
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6.2 Those proposing development are responsible for:-
o Demonstrating that it is consistent with Planning Policy.
o Providing a Flood Risk Assessment demonstrating:
i) Whether any proposed development is likely to be affected by current
or future flooding from any source;
ii) Satisfying the Local Planning Authority that the development is safe and
where possible reduces flood risk overall;
iii) Whether it will increase flood risk elsewhere and the measures proposed to
deal with these effects and risks.
iv) Any necessary flood risk management measures should be sufficiently
funded to ensure that the site can be developed and occupied safely
throughout its proposed lifetime.
o Designs which reduce flood risk to the development and elsewhere, by incorporating
sustainable drainage systems and, where necessary, flood resilience measures.
o Identifying opportunities to reduce flood risk, enhance biodiversity and amenity,
protect the historic environment and seek collective solutions to managing flood risk.
7.0 Site-specific Flood Risk Assessments
7.1 Planning applications for development proposals of one hectare or greater in Flood Zone 1
and all proposals for new development located in Flood Zones 2 and 3 should be accompanied
by a FRA. This should identify and assess the risks of all forms of flooding to and from the
development and demonstrate how these flood risks will be managed, taking climate change
into account.
7.2 For major developments in Flood Zone 1, the Flood Risk Assessment should identify
opportunities to reduce the probability and consequences of flooding.
Site Specific Flood Risk Assessment
Proposed Industrial Units, Empire Business Park, Enterprise Way, Burnley BB12 6LT
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7.3 A FRA will also be required where the proposed development or change of use to a more
vulnerable class may be subject to other sources of flooding or where the Environment Agency,
Internal Drainage Board and/or other bodies may indicate that there may be drainage
problems.
8.0 The Sequential Test 8.1 The risk-based Sequential Test should be applied at all stages of planning. Its aim is to steer
new development to areas at the lowest probability of flooding i.e. Zone 1
8.2 The Flood Zones are the starting point for the sequential approach. Zones 2 and 3 are shown
on the Environment Agency Flood Map with Flood Zone 1 being all the land falling outside
Zones 2 and 3.
8.3 These Flood Zones refer to the probability of sea and river flooding only, ignoring the presence
of existing defences.
8.4 Regional Flood Risk Appraisals (RFRAs) will refer to Environment Agency Flood Maps and
will utilise further information such as Strategic Flood Risk Assessments to allow flood risk to
be taken into account in a broad regional context
8.5 Strategic Flood Risk Assessments (SFRAs ) will refine information on the probability of
flooding, taking other sources of flooding and the impacts of climate change into account.
8.6 Where a SFRA is not available, the Sequential Test will be based on the Environment Agency
Flood Zones.
9.0 Test Results 9.1 No SFRA have been identified for this area.
9.2 Examination of The Environment Agency Flood Map reproduced below shows the area
where the industrial unit is proposed to have a very unlikely chance of flooding from rivers
and the sea.
Site Specific Flood Risk Assessment
Proposed Industrial Units, Empire Business Park, Enterprise Way, Burnley BB12 6LT
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Fig. VI - Extract from the Environment Agency’s Flood Map
Site Specific Flood Risk Assessment
Proposed Industrial Units, Empire Business Park, Enterprise Way, Burnley BB12 6LT
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9.3 Consulting Technical Guidance to the National Planning Policy Framework (March 2012)
and taking into account the Environment Agency’s Flood Maps Guidance Zone 1 – Low
Probability, the uses, requirements and aims in this zone are reproduced below
Table 1: Flood Zone
9.4 Table 2 below, also reproduced from the National Planning Policy Framework gives this site
a ‘Less Vulnerable’ flooding category as the site will be used for general industry.
.
Table 2: Flood Risk Vulnerability Classification
Site Specific Flood Risk Assessment
Proposed Industrial Units, Empire Business Park, Enterprise Way, Burnley BB12 6LT
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9.5 Table 3 below in the category ‘less vulnerable’ in and the flood risk Zone 1 concedes that
development is appropriate in this case, even without flood defences.
Table 3: Flood Risk Vulnerability and Flood Zone ‘Compatibility’
10.0 Assessment of the Flood risk
10.1 Flooding from rivers or streams
10.1.1 The Environment Agency Flood Maps have been consulted and they confirm that the site
falls within a Flood Zone 1 area indicating that flooding from rivers or streams is very
unlikely.
10.1.2 Application of the Sequential Test in NPPF concedes that development is appropriate, even
without flood defences.
Site Specific Flood Risk Assessment
Proposed Industrial Units, Empire Business Park, Enterprise Way, Burnley BB12 6LT
DG-A Ltd Page 10 of 15 November 2013
10.1.3 A search has been made on the British Hydrological Society Chronology of British
Hydrological Events (http://www.dundee.ac/geography/cbhe) and an internet search but no
records were found of any flooding on the site.
10.1.4 Neither are there any past flood event locations recorded in Burnley on the Lancashire
Preliminary Flood Risk Assessment Map of Past Floods
Fig. VII - Extract from the Lancashire Flood Risk Assessment Map
10.2 Flooding from the Sea
10.2.1 The sea is some considerable distance away and has no influence on the site
Site Specific Flood Risk Assessment
Proposed Industrial Units, Empire Business Park, Enterprise Way, Burnley BB12 6LT
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10.3 Flooding from Land
10.3.1 As this site falls gently to the west there should be no flooding from the land
10.3.2 Rainfall falling on the site will follow the natural lie of the land and enter the existing
drainage system, which with regard to the existing buildings and vehicle and pedestrian areas
is retained in sub-surface porous material and is eventually returned to the drainage system
to the north west of the site.
10.3.3 The surface water for new buildings will need to be addressed by the provision of an
adequate SUDS drainage system to collect the rainwater and prevent it from causing a
problem to the development and other adjacent property.
Fig. VIII – Flow of Water Across the Site
Site Specific Flood Risk Assessment
Proposed Industrial Units, Empire Business Park, Enterprise Way, Burnley BB12 6LT
DG-A Ltd Page 12 of 15 November 2013
10.4 Flooding from Groundwater
10.4.1 Groundwater flooding occurs when water levels in the ground rise above surface elevations.
10.4.2 No groundwater issues have been identified so flooding from this source is unlikely.
Fig. IX – Ground Water Flooding
10.5 Flooding from Sewers
10.5.1 Flooding of this site itself from public sewers is thought to be unlikely. However, the surface
water sewer which crosses the site to the north is overloaded downstream across the cricket
field so it is unlikely that United Utilities will allow a connection to it but there is already an
alternative to the north west after SUDS retention.
10.5.2 The proposals are to be designed so that there is no flooding to property with a 1:100 year
storm with a 20% increase for climatic change for a lifetime up to 2085 and 30% beyond this
date.
Site Specific Flood Risk Assessment
Proposed Industrial Units, Empire Business Park, Enterprise Way, Burnley BB12 6LT
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10.5.3 The existing surface water sewer will need to be diverted around the proposed building to the
north of the site
Fig. X – Sewer Map
10.6 Flooding from reservoirs, canals or other sources
11.6.1 The Leeds and Liverpool Canal lies to the south supported by an embankment
11.6.2 The site falls in the general direction of the blue arrows show in Fig. VIII and if there are any
problems the site is unlikely to be affected.
Site Specific Flood Risk Assessment
Proposed Industrial Units, Empire Business Park, Enterprise Way, Burnley BB12 6LT
DG-A Ltd Page 14 of 15 November 2013
10.7 Flooding from Water Mains
10.7.1 If a water main bursts then the flows will be similar to overland flows from sewers and the
canal
10.7.2 It is also submitted that if the private and public water stop taps are accessible and suitable for
purpose, then it is not expected that there will be a problem.
Fig. XI – Water Mains
Site Specific Flood Risk Assessment
Proposed Industrial Units, Empire Business Park, Enterprise Way, Burnley BB12 6LT
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11.0 CONCLUSIONS
11.1 The area is in Zone 1 of the EA Flood Maps and has a ‘less vulnerable’ classification because
the site will be used for general industry. Application of the Sequential Test in accordance
with The Communities and Local Government Department: Technical Guidance to the
National Planning Policy Framework (March 2012) confirms that the site is considered to be
appropriate for development.
11.2 Although the flood risk to the development being low, it is advised that good quality seals to
all the access doors are fitted, the building ground floor level is as high as it can be and
electrical outlet sockets are 450mm above skirting level on the ground floor.
11.3 In this particular case it is not considered necessary to suggest that new occupiers take
advantage of the Environment Agency’s Flood Warning Scheme so that they may receive
information and decide upon the most suitable course of action should there be an extreme
rainfall event. Access to this service is via the internet.
11.4 Burnley Borough Council and United Utilities Sewer Management have no knowledge of
any flooding problems on this particular site although approval of an appropriate point of
connection and an approved SUDS design to ensure that the buildings to not flood in 1:100
year storm will no doubt be required.
11.5 It is concluded that there should be no significant risk of flooding to the inside of property or
car park and no predicable danger to life or property.
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