Feethams Area Redevelopment - Darlington Borough Council

Transcription

Darlington Borough Council
Feethams Area Redevelopment
Flood Risk Assessment
April 2008
Revision Schedule
April 2008
S105195
Rev
01
Date
Details
Prepared by
Reviewed by
Approved by
14/04/2008
Draft Report Srimali Abeyrathne
Undergraduate Civil
Engineer
Charles Craigs
Senior Civil Engineer
Les Orange
Associate
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© Scott Wilson Scotland Ltd 2008
April 2008
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Contents
Page No
Abbreviations and Acronyms ....................................................1
Summary of References ...........................................................2
Executive Summary..................................................................3
1.0
Introduction.....................................................................4
2.0
Policy Relating To Flood Risk .........................................5
2.1
General.......................................................................................................... 5
3.0
Development Site ...........................................................6
3.1
3.2
3.3
3.4
3.5
Site Location.................................................................................................. 6
Site Description ............................................................................................. 6
Topography ................................................................................................... 6
Development Proposals ................................................................................ 7
Planning Policy Guidance – Sequential Test................................................. 7
4.0
Statutory Consultation ....................................................8
4.1
4.2
Environment Agency Consultation................................................................. 8
NWL Consultation.......................................................................................... 8
5.0
Sources of Flooding........................................................9
5.1
5.2
5.3
Fluvial/Tidal Flooding..................................................................................... 9
Surface Water Runoff and Overland Flooding............................................... 9
Climate Change........................................................................................... 10
6.0
Surface Water Management .........................................11
6.1
6.2
Existing Surface Water Drainage................................................................. 11
Proposed Surface Water Management ....................................................... 11
7.0
Mitigation Measures and Residual Risk ........................12
April 2008
7.1
7.2
Minimum Ground Levels.............................................................................. 12
Flood Warning, Emergency Evacuation and Access ................................... 12
8.0
Conclusions and Recommendations.............................13
Appendices
Appendix A
Site Location
Appendix B
Topographical Survey
Appendix C
Planning Policy Statement 25 – References
Appendix D
Environment Agency Correspondence
Appendix E
Northumbrian Water Ltd Correspondence
Appendix F
Site Cross Sections
Appendix G
Floodplain Map
Appendix H
WinDes Calculations
April 2008
Abbreviations and Acronyms
The abbreviations and acronyms used within this report shall have the following meanings:
AOD
Above Ordnance Datum (Newlyn)
DoE
Department of Environment
DEFRA
Department for Environment, Food and Rural Affairs
EA
Environment Agency
EIA
Environmental Impact Assessment
FEH
Flood Estimation Handbook
FRA
FSR
Flood Studies Report
IFM
Indicative Floodplain Maps
IoH
Institute of Hydrology
IH124
Institute of Hydrology Report 124
LPA
Local Planning Authority
OS
Ordnance Survey
PPS25
Planning Policy Statement 25: Development and Flood Risk December 2006.
RFRA
Regional Flood Risk Appraisal
SFRA
Strategic Flood Risk Assessment
SUDS
Sustainable Urban Drainage Systems
NWL
Northumbrian Water Limited
April 2008
Page No 1
Summary of References
Design and analysis of urban storm drainage – The Wallingford Procedure, Volume 1-Principles, methods and practice. Department of Environment. The Flood Studies Report Volumes 1 – V 1975 and Supplementary Reports. Institute of Hydrology Report 124 June 1994. Planning Policy Statement 25: Development and Flood Risk. December 2006. National Standing Advice to Local Planning Authorities for Planning Applications; Development and Flood Risk. CIRIA R156 Infiltration Drainage 1996. Interim Code of Practice for Sustainable Drainage Systems July 2004. Framework for Sustainable Drainage Systems in England and Wales, National SUDS Working Group May 2003. CIRIA C609 Sustainable Drainage Systems Hydraulic, structural and water quality advice 2004. Sewers for Adoption 6th Edition April 2008
Page No 2
Executive Summary
This report provides a flood risk assessment for a proposed redevelopment programme for the
Feethams area in Darlington.
The report assess if the proposed regeneration area is likely to be affected by flooding and whether
there will be an increase in flood risk else where as a result of redevelopment. This report is compiled
in accordance with Planning Policy Statement 25: Development and Flood Risk (PPS25), which
summaries government policy with respect to flood risk.
The development proposal consists of redevelopment of the regeneration area for commercial and
residential use in the future. Prior to this development taking place it has been proposed to develop
the Arriva Bus Depot site as a temporary car park for use up to five years and this will also then be
redeveloped for commercial or residential use.
The Environment Agency (EA) Floodplain Map indicates that the entire regeneration area to the East
and South-Eastern corner of the area to the West of the Feethams road lies within the light blue
shaded area. The PPS25 defines this area as Flood Zone 2 Medium Probability, which comprises land
assessed as having between a 1 in 100 and 1 in 1000 annual probability of river flooding or between a
1 in 200 and 1 in 1000 annual probability of sea flooding in any given year.
The Predicted flood level provided by the EA for 1 in 100 year return period storm when used in
conjunction with site specific topographical data indicates that it is unlikely the site will flood. A site
cross-section drawing has been produced for the site. This indicates that due to elevated ground level
of the regeneration area the flood water will not reach the site. Hence the redevelopment site is
deemed appropriate for residential or commercial use.
The EA have advised that they would view it as best practice for discharge of surface water from the
site. The EA have recommended this is to be regulated to that of the existing site and further
consideration should be given to restricting the discharge down to the Greenfield runoff rate in order to
protect the regeneration area and the neighbouring properties down stream from surface water runoff
and overland flooding.
In order to restrict the discharge rate the new drainage systems will require incorporating some form of
attenuation within the site. The attenuation could be provided using either engineering techniques or
Sustainable Urban Drainage Systems (SUDS). Engineering techniques could include box culverts,
cellular storage, attenuation tanks or oversized pipes, with a flow control device at the outlet although
Annex F of PPS25 emphasises the importance of using SUDS where possible.
Depending on the ground conditions and underlying soil types, it is recommended that consideration
be given to the use of infiltration based SUDS. This could include filter strips and swales, permeable
surfaces and filter drains, infiltration devices, basins and ponds or combined approach where possible.
April 2008
Page No 3
1.0 Introduction
Scott Wilson was commissioned by Darlington Borough Council to prepare a Flood Risk
Assessment (FRA) in support of a Planning and Development Brief for the Feethams area
of Darlington. The Brief has been initiated in response to developer enquires and to
maximise the regeneration potential for the area.
New Planning Policy Statement 25: Development and Flood Risk (PPS25), was published in
December 2006. This flood risk assessment considers the regeneration area in line with
PPS25 by using a holistic risk based approach which assesses potential flooding from all
identified sources including fluvial, groundwater and surface water runoff.
The purpose of this report is to assess whether the proposed regeneration area is likely to
be affected by flooding, whether it will increase flood risk elsewhere and to propose potential
measures to manage or mitigate any affects whilst minimising the impact on the
environment.
The Environment Agency and Northumbrian Water Limited have been consulted to obtain
relevant information. The report includes technical background for the planning process and
provides information from which a detailed design solution should evolve.
April 2008
Page No 4
2.0 Policy Relating To Flood Risk
2.1
General
Current Government policy is to reduce the risks to people and the developed and natural
environment from flooding. It is the role of the Local Planning Authorities (LAPs) to ensure
that flood risk is taken into account during the planning stage of any proposed development.
National policy on development and flood risk was given in Planning Policy Guidance Note
(PPG25) which was influenced by the response to significant flooding events in the United
Kingdom at Easter 1998 and Autumn 2000. This was superseded by Planning Policy
Statement 25: Development and Flood Risk (PPS25) in December 2006, the thrust of which
is set out below:
Regional planning bodies and LPAs should prepare and implement planning strategies that
help to deliver sustainable development by:
a) Identifying land at risk and the degree of risk of flooding from river, sea and other
sources in their areas;
b) Preparing Regional Flood Risk Appraisals (RFRAs) or Strategic Flood Risk
Assessments (SFRAs) as appropriate, as freestanding assessments that contribute to
the Sustainability Appraisals of their plans;
c) Framing policies for the location of development which avoid flood risk to people and
property where possible, and manage any residual risk, taking account of the impacts of
climate change;
d) Only permitting development in areas of flood risk when there are no reasonably
available sites in areas of lower flood risk and benefits of the development outweigh the
risks from flooding;
e) Safeguarding land from development that is required for current and future flood
management for example conveyance and storage of flood water, and flood defences;
reducing flood risk to and from new development through location, layout and design,
incorporating Sustainable Drainage Systems (SUDS);
f) Using opportunities offered by new development to reduce the causes and impacts of
flooding for example surface water management plans; making the most of the benefits
of green infrastructure for flood storage, conveyance and SUDS; re-creating functional
floodplain; and setting back defences;
g) Working effectively with the Environment Agency (EA), other operating authorities and
other stakeholders to ensure that best use is made of their expertise and information so
that plans are effective and decisions on planning applications can be delivered
expeditiously;
h) Ensuring spatial planning supports flood risk management policies and plans, River
Basin Management Plans and emergency planning.
April 2008
Page No 5
3.0 Development Site
3.1
Site Location
The regeneration area is situated in central Darlington adjacent to the Victoria Road
junction. The OS grid reference is NZ 290 142. A detailed site location plan is included in
Appendix A.
3.2
Site Description
The area of land proposed for regeneration is approximately 2.4ha and the site extends to
the West and the East of Feethams Road. The area to the West is currently a car park and
the area to the East comprises the Darlington Arriva Bus Depot and a part of the Town Hall
car park.
The West part of the regeneration area is bounded by Houndgate to the North, Beaumont
Street to the West and the South and the Feethams road to the East. The East part of the
regeneration area is bounded by the Feethams road and the Town Hall building to the East,
Victoria road junction to the South, the Town Hall building and St Cuthberts Church to the
North and the River Skerne to the East.
The River Skerne is located approximately 22m to the east of the proposed regeneration
area, which passes under the dual carriageway A167, just south east of the site. The River
Skerne ultimately discharges into the River Tees.
The River bank and retaining wall which run along the east boundary of the regeneration
area act as informal flood defences for the site.
3.3
Topography
The topography of the regeneration area to the East of the Feethams road varies from
38.75m AOD at the North-Western corner to 37.410m AOD at the South-Eastern corner.
Similarly the topography of the regeneration area to the West of the Feethams road varies
from 44.490m AOD at the North-Western corner to 37.910m AOD at the South-Eastern
corner.
A full site topographical survey has been completed and a copy is included at Appendix B.
April 2008
Page No 6
3.4
Development Proposals
The development proposal for the area to East of the Feethams road consists of
redevelopment of the Arriva Bus Depot site and part of the Town Hall car park for
commercial and residential use in the future. Prior to this development taking place it has
been proposed to develop the Arriva Bus Depot site as a temporary car park for use for up
to five years.
The area to the West of the Feethams road currently is occupied by Beaumont Street car
park and will be developed for commercial and residential use.
3.5
Planning Policy Guidance – Sequential Test
PPS25 aims to ensure inappropriate development is avoided in areas at risk of flooding.
The sequential test, required under PPS25, is a tool for determining land uses that are
compatible with the level of flood risk at each development site within a local authority area.
It directs development towards Flood Zone 1 wherever possible, followed by the areas of
least flood risk within Flood Zones 2 and 3.
The area to the East of the Feethams road, lies within Flood Zone 2 of the Environment
Agency flood zone maps, i.e. land assessed as having between a 1 in 100 and 1 in 1000
annual probability of river flooding or between a 1 in 200 and 1 in 1000 annual probability of
flooding from the sea in any given year (see table D.1, PPS25). The flood risk vulnerability
categories are described in table D.2 of PPS25. From those vulnerability categories the
water-compatible, less vulnerable, more vulnerable uses of land and essential
infrastructures are deemed appropriate in the Flood Zone 2 as described in table D.3 of
PPS25. The highly vulnerable uses are only permitted in this Zone if the Exception Test is
passed.
Similarly the South-Eastern corner of the area to the West of the Feethams road lies within
the Flood Zone 2 while the remaining area lies within the Flood Zone 1. The Flood Zone 1
comprises land assessed as having a less than 1 in 1000 annual probability of river or sea
flooding in any given year. As indicated in Table D.3 of PPS25 all uses of land are
appropriate in the Flood Zone 1.
In the table D.2 of PPS25 residential and commercial uses are classified as more vulnerable
and less vulnerable. Hence the proposed uses are deemed appropriate in the regeneration
area.
The tables D.1, D.2 and D.3 of PPS25 are included in Appendix C of this report.
April 2008
Page No 7
4.0 Statutory Consultation
4.1
Environment Agency Consultation
The EA were consulted to obtain site specific flood data for the proposed regeneration area.
The EA advised the highest recorded flood level in the vicinity of the site is 36.82m AOD in
2000. The River Skerne Pre Feasibility Study gives a modelled 1 in 100 year flood level of
37.39m AOD at this location.
The EA have advised that they would view it as best practice for discharge of surface water
from the site. This is to be regulated to that of the existing site and further consideration
should be given to restricting the discharge down to the Greenfield agricultural rate.
The EA have mentioned that they are keen to promote the use of sustainable drainage
systems and draws attention to Annex F of PPS25.
Furthermore the EA have provided a map showing the extent of flooding in 2000. This
confirms that the site is not shown to be within the historic flood outline. The EA
correspondence is included in Appendix D.
4.2
NWL Consultation
Northumbrian Water Ltd was consulted to obtain information on existing drainage systems
in the vicinity of the area. Records received indicate an existing combined sewer runs along
the River Skerne. A 900mm concrete combined sewer runs along Houndgate and the
Feethams road towards the Victoria road junction.
Also another three small combined sewers discharge from the regeneration area to the
West into a 450mm concrete combined sewer which runs along Beaumont Street. This
combined sewer then connects into the 900mm concrete combined sewer which runs along
the Feethams road and eventually discharges into the large combined sewer, which runs
along the River Skerne, at the Victoria road junction.
Records also indicate that a large concrete surface water sewer runs adjacent to the North
boundary wall of the Arriva Bus Depot building and discharges directly into the River Skerne
at the North-Eastern corner of the site. The NWL consultations are included in Appendix E
of this report.
April 2008
Page No 8
5.0 Sources of Flooding
5.1
Fluvial/Tidal Flooding
The Environment Agency Floodplain Map indicates that the entire regeneration area to the
East and South-Eastern corner of the area to the West of the Feethams road lies within the
light blue shaded area. The PPS25 defines this area as Flood Zone 2 Medium Probability,
which comprises land assessed as having between a 1 in 100 and 1 in 1000 annual
probability of river flooding or between a 1 in 200 and 1 in 1000 annual probability of sea
flooding in any given year.
The dark blue shaded area indicates the flooding from rivers or the sea without flood
defences. The PPS25 defines this area as Flood Zone 3a High Probability, which is
described as having a 1 in 100 or greater annual probability of river flooding or a 1 in 200 or
greater annual probability of sea flooding in any year.
The River Skerne Pre Feasibility Study modelled flood levels data provided by the EA
indicates that 1 in 100 year return period storm will produce a flood level of 37.39m AOD.
The Predicted flood level for 1 in 100 year return period storm when used in conjunction with
site specific topographical data indicates that it is unlikely the site will flood. A site cross
section drawing has been produced for the site. This indicates that due to elevated ground
level of the regeneration area the flood water will not reach the site. The proposed ground
levels for the area to the East are in the region of 37.90m and 38m AOD. The site cross
section drawing is included in Appendix F.
A representation of the EA floodplain map is included in Appendix G of this report. It is
important to recognise that the EA state the floodplain map is an awareness tool and is not
accurate to the level of individual properties. The Floodplain Map does not differentiate
between defended and undefended area nor does it take account of the likelihood that flood
risk will increase with climate change.
5.2
Surface Water Runoff and Overland Flooding
Surface water can cause localised flooding, particularly low-lying areas, and the
development should be designed to minimise the impact of surface water runoff to adjacent
sites downstream.
As advised by the EA, for new developments within the regeneration area it will be
necessary to consider the best practice for discharge of the surface water from the site. The
EA have recommended that this is to be regulated to that of the existing site and further
consideration should be given to restricting the discharge down to the Greenfield runoff rate
in order to protect the regeneration area and the neighbouring properties down stream from
surface water runoff and overland flooding.
April 2008
Page No 9
5.3
Climate Change
The Environment Agency Flood Map and Flood Zones do not currently take account of
future climate change. Annex A of PPS25 advises that the effects of climate change at a
regional level are likely to mean an increase in peak fluvial flows and rainfall intensities and
these impacts should be considered in the preparation of Flood Risk Assessments. Table
B.2, Annex A of PPS25 suggests sensitivity ranges in peak fluvial flows and rainfall
intensities, and indicates a 20% increase in both river flows and rainfall intensities could
occur over the period 2025-2085.
The EA have provided a flood level for a 1 in 100 year return period storm with no climate
change. This indicates that the site is not at risk of flooding however further consultation
require with the EA in order to establish a flood level for a 1 in 100 year return period storm
with increase in climate change. It will be necessary to consider and incorporate the 20%
increase in peak fluvial flows and rainfall intensities into new drainage systems for any new
future developments at this location.
April 2008
Page No 10
6.0 Surface Water Management
6.1
Existing Surface Water Drainage
Existing drainage records received for the vicinity of the site, from Northumbrian Water Ltd
are detailed in section 4.2 of this report.
The existing urban runoff rate was calculated using the IH 124 input methods of Source
Control on WinDes and are included in Appendix I. The soil factor value of 0.45 was taken
from Flood Estimate Handbook (FEH). The standard period (1961-1990) average rainfall
(SAAR) value 700mm was also taken from FHE, via the WinDes Source Control maps.
Based on the existing development plan it is estimated that 70% (0.70) of the Catchment is
urbanised. The calculated urban runoff rate and Greenfield runoff rate for a 1 in 1 year
return period storm respectively are 37.7l/s and 14.7l/s.
6.2
Proposed Surface Water Management
As discussed in section 5.2, future developments within the regeneration area are
recommended to consider the best practice for discharge of the surface water from the site.
This is to be regulated to that of the existing site and further consideration should be given
to restricting the discharge down to the Greenfield runoff rate.
In order to restrict the discharge rate the new drainage systems will require incorporating
some form of attenuation within the site. The attenuation could be provided using either
engineering techniques or SUDS. Engineering techniques could include box culverts,
cellular storage, attenuation tanks or oversized pipes, with a flow control device at the outlet
although Annex F of PPS25 emphasises the importance of using SUDS where possible.
Depending on the ground conditions and underlying soil types, it is recommended that
consideration be given to the use of infiltration based SUDS. This could include filter strips
and swales, permeable surfaces and filter drains, infiltration devices, basins and ponds or
combined approach where possible.
April 2008
Page No 11
7.0 Mitigation Measures and Residual Risk
7.1
Minimum Ground Levels
Floor levels for new developments within the regeneration area could be set a minimum of
150mm above surrounding ground levels to protect against localised flooding from surface
water runoff and surcharging of existing drainage systems in the event of a storm greater
than 1 in 30 years.
7.2
Flood Warning, Emergency Evacuation and Access
Developments in flood risk areas must provide safe, dry access and egress to enable
evacuation of people, routes for emergency services and flood defence authorities to carry
out necessary duties during a flood event.
As discussed in section 5 of this report it is evident that the regeneration area has
significantly minor risk from flooding. Therefore it is not considered necessary to provide a
formal evacuation plan as there is only a minor risk to human life posed by flooding at this
location.
April 2008
Page No 12
8.0 Conclusions and Recommendations
This FRA has been prepared with reference to PPS25, and in consultation with the
Environment Agency and Northumbrian Water. The FRA is to accompany a Planning and
Development Brief for the Feethams area of Darlington. The Brief has been initiated in
response to developer enquires and to maximise the regeneration potential for the area.
The redevelopment site is situated in central Darlington adjacent to the Victoria Road
junction. The OS grid reference is NZ 290 142.
The development proposal consists of redevelopment of the regeneration area for
commercial and residential use in the future. Prior to this development taking place it has
been proposed to develop the Arriva Bus Depot site as a temporary car park for use up to
five years and this will also then be redeveloped for commercial or residential use.
The Environment Agency (EA) Floodplain Map indicates that the entire regeneration area to
the East and South-Eastern corner of the area to the West of the Feethams road lies within
the light blue shaded area. The PPS25 defines this area as Flood Zone 2 Medium
Probability, which comprises land assessed as having between a 1 in 100 and 1 in 1000
annual probability of river flooding or between a 1 in 200 and 1 in 1000 annual probability of
sea flooding in any given year.
The Predicted flood level provided by the EA for 1 in 100 year return period storm when
used in conjunction with site specific topographical data indicates that it is unlikely the site
will flood. A site cross-section drawing has been produced for the site. This indicates that
due to elevated ground level of the regeneration area the flood water will not reach the site.
Hence the redevelopment site is deemed appropriate for all uses of land described in
PPS25 including residential and commercial use.
The EA have advised that they would view it as best practice for discharge of surface water
from the site. The EA have recommended this is to be regulated to that of the existing site
and further consideration should be given to restricting the discharge down to the Greenfield
runoff rate in order to protect the regeneration area and the neighbouring properties down
stream from surface water runoff and overland flooding.
In order to restrict the discharge rate the new drainage systems will require incorporating
some form of attenuation within the site. The attenuation could be provided using either
engineering techniques or Sustainable Urban Drainage Systems (SUDS). Engineering
techniques could include box culverts, cellular storage, attenuation tanks or oversized pipes,
with a flow control device at the outlet although Annex F of PPS25 emphasises the
importance of using SUDS where possible.
Depending on the ground conditions and underlying soil types, it is recommended that
consideration be given to the use of infiltration based SUDS. This could include filter strips
and swales, permeable surfaces and filter drains, infiltration devices, basins and ponds or
combined approach where possible.
April 2008
Page No 13
Appendix A
Site Location
April 2008
Appendices
SITE LOCATION
Drawing Title
FEETHAMS REDEVELOPMENT
FLOOD RISK ASSESSMENT
SITE LOCATION PLAN
S105195 - 1001
Scale at A4 : N.T.S.
Drw CAB
App LNO
Rev -
Chk SA
Date 25/01/08 Date -
www.scottwilson.com
Appendix B
Topographical Survey
April 2008
Appendices
This map is reproduced from Ordnance Survey Material
with the permission of Ordnance Survey on behalf of
the Controller of Her Majesty's Stationery Office.
© Crown copyright. Unauthorised reproduction
infringes Crown copyright and may lead to
prosecution or civil proceedings.
Licence No. 100023728. 2008.
Appendix C
Planning Policy Statement 25 – References
April 2008
Appendices
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:9(92/.9:=**69./50*90(5+=79:d
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E,9(5/)+2%e:9(92/.9:2=0::98505*5/0h;/11/02%30/'0=+Q,/'08592:I=0:gdC99R009&Q/8E2=00507E/25;%
C*=*9190*_8'"$+(-d
Appendix D
Environment Agency Correspondence
April 2008
Appendices
Appendix E
Northumbrian Water Ltd Correspondence
April 2008
Appendices
Appendix F
Site Cross Sections
April 2008
Appendices
This map is reproduced from Ordnance Survey Material
with the permission of Ordnance Survey on behalf of
the Controller of Her Majesty's Stationery Office.
© Crown copyright. Unauthorised reproduction
infringes Crown copyright and may lead to
prosecution or civil proceedings.
Licence No. 100023728. 2008.
THIS DRAWING MAY BE USED ONLY FOR
THE PURPOSE INTENDED AND ONLY
WRITTEN DIMENSIONS SHALL BE USED
NOTES
Revision Details
By
Date
Suffix
Check
Drawing Status
FOR INFORMATION
Job Title
FEETHAMS
REDEVELOPMENT
Drawing Title
SITE PLAN
SHOWNING 1 IN 100 YEAR
FLOOD AT LEVEL 37.39m
Scale at A1
1:500
Drawn
Approved
CAB
LNO
Stage 1 check
Stage 2 check
Originated
Date
BS
CNC
SA
13/03/08
Scott Wilson
Victoria House
159 Albert Road
Middlesbrough
TS1 2PX
T 01642 218476
F 01642 223582
Drawing Number
S105195 - 2001
Rev
-
THIS DRAWING MAY BE USED ONLY FOR THE PURPOSE INTENDED AND ONLY WRITTEN DIMENSIONS SHALL BE USED
NOTES
Revision Details
By
Date
Suffix
Check
Drawing Status
FOR INFORMATION
Job Title
FEETHAMS
REDEVELOPMENT
Drawing Title
SITE CROSS SECTIONS SHOWING 1 IN 100 YEAR
SHEET 1 OF 2
Scale at A1
AS SHOWN
Drawn
Approved
CAB
LNO
Stage 1 check
Stage 2 check
Originated
Date
BS
CNC
SA
04/03/08
Scott Wilson
Victoria House
159 Albert Road
Middlesbrough
TS1 2PX
T 01642 218476
F 01642 223582
Drawing Number
S105195 - 2002
Rev

THIS DRAWING MAY BE USED ONLY FOR THE PURPOSE INTENDED AND ONLY WRITTEN DIMENSIONS SHALL BE USED
NOTES
Revision Details
By
Date
Suffix
Check
Drawing Status
FOR INFORMATION
Job Title
FEETHAMS
REDEVELOPMENT
Drawing Title
SITE CROSS SECTIONS
SHOWING 1 IN 100 YEAR
SHEET 2 OF 2
Scale at A1
AS SHOWN
Drawn
Approved
CAB
LNO
Stage 1 check
Stage 2 check
Originated
Date
BS
CNC
SA
04/03/08
Scott Wilson
Victoria House
159 Albert Road
Middlesbrough
TS1 2PX
T 01642 218476
F 01642 223582
Drawing Number
S105195 - 2003
Rev

Appendix G
Floodplain Map
April 2008
Appendices
SITE LOCATION
Drawing Title
FEETHAMS REDEVELOPMENT
FLOOD RISK ASSESSMENT
FLOODPLAIN MAP
S105195 - 1002
Scale at A4 : N.T.S.
Drw CAB
App LNO
Rev -
Chk SA
Date 25/01/08 Date -
www.scottwilson.com
Appendix H
WinDes Calculations
April 2008
Appendices
Scott Wilson
Victoria House
159 Albert Road
Middlesbrough TS1 2PX
Date 14/04/2008
File
Micro Drainage
Page 1
Feethams FRA
Designed By SA
Checked By
Source Control W.11.2
IH 124 Mean Annual Flood
Input
Return Period (years)
Area (Ha)
1
2.400
Q
SAAR (mm)
Soil
700.000
0.450
Results
l/s
QBAR Rural
QBAR Urban
14.7
37.7
1 year
Q
1
Q
2
Q
5
Q
10
Q
20
Q
25
Q
30
Q
50
Q 100
Q 200
Q 250
Q 1000
year
years
years
years
years
years
years
years
years
years
years
years
32.4
32.4
39.5
48.5
52.6
56.2
57.1
57.8
59.6
61.9
66.7
68.1
77.0
©1982-2008 Micro Drainage
Urban
Region Number
0.700
3

Feethams Area Redevelopment - Darlington Borough Council

Transcription

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