flood consequence assessment

Taff Vale Redevelopment Taff Street, Pontypridd CF37 4TD

Flood Consequence Assessment

Final report for

On behalf of

Rhondda Cynon Taff County Borough Council

May 2017

Hydrock Reference: C-05366-C

TVR-HYD-PH1-XX-RP-D-5001 P1.2 S0

Darnton B3 Flood Consequence Assessment TVR-HYD-PH1-XX-RP-D-5001 P1.2 S0

DOCUMENT CONTROL SHEET Issued by: Hydrock Consultants Limited

Over Court Barns Over Lane Almondsbury Bristol BS32 4DF Tel: 01454 619533 Fax: 01454 614125 www.hydrock.com

Project: Taff Vale Redevelopment Title: Flood Consequence Assessment Client: Darnton B3 Status: Final Date: May 2017 Document Production Record

Issue Number: P1.2 Name Signature

Prepared Iain Hissett BSc, MSc

Flood Risk Consultant

Checked Jon Cracknell BSc, MSc

Senior Flood Risk Consultant

Approved David Lloyd BSc, PhD

Technical Director – Flood Risk

Document Revision Record

Issue number Date Revision Details

P1.1 17th May 2017 Draft report

P1.2 23rd May 2017 Final Report taking on client review comments

Hydrock Consultants Limited has prepared this report in accordance with the instructions of the above named client for their sole and specific use. Any third parties who may use the information contained herein do so at their own risk.


Hydrock Consultants 3

CONTENTS

1.0 INTRODUCTION ................................................................................................................................. 5 2.0 SITE INFORMATION ........................................................................................................................... 6

2.1 Location ........................................................................................................................................ 6 2.2 Existing Land Use .......................................................................................................................... 7 2.3 General Topography ..................................................................................................................... 7 2.4 Proposed Development ................................................................................................................ 7

3.0 SOURCES OF FLOOD RISK .................................................................................................................. 8 3.1 Fluvial Flooding ............................................................................................................................. 8 3.2 Tidal Flooding.............................................................................................................................. 11 3.3 Surface Water Flooding .............................................................................................................. 11 3.4 Groundwater Flooding ................................................................................................................ 12 3.5 Sewer Flooding ........................................................................................................................... 12 3.6 Infrastructure Failure Flooding ................................................................................................... 13

4.0 HISTORIC FLOODING ....................................................................................................................... 14 5.0 TAN15 AND THE PROPOSED DEVELOPMENT .................................................................................. 15

5.1 Planning Policy Requirements .................................................................................................... 15 5.2 Flood Resistance ......................................................................................................................... 17 5.3 Natural Resources Wales Flood Warning Service ....................................................................... 17 5.4 Flood Emergency Plan ................................................................................................................ 17

6.0 CLIMATE CHANGE ........................................................................................................................... 19 6.1 Peak Rainfall Intensity ................................................................................................................ 19 6.2 Peak River Flow ........................................................................................................................... 19

7.0 DRAINAGE ....................................................................................................................................... 20 8.0 ENVIRONMENTAL PERMIT FOR FLOOD RISK ACTIVITIES ................................................................ 21 9.0 SUMMARY ....................................................................................................................................... 22 REFERENCES ................................................................................................................................................ 24 APPENDIX A – SITE LOCATION APPENDIX B – TOPOGRAPHICAL SURVEY APPENDIX C – PROPOSED LAYOUT



FIGURES

Figure 1 Site Location .................................................................................................................................... 6

Figure 2 NRW Fluvial and Tidal Flood Map (Approximate Site Location in Red Outline) ............................. 9

Figure 3 View Downstream from Right/East Bank, North of Site ............................................................... 11

Figure 4 NRW Surface Water Flooding (Approximate Site Location in Red Outline) ................................. 12

Figure 5 NRW Reservoir Flooding (Approximate Site Location in Red Outline) ......................................... 13

Figure 6 Development Advice Map (Approximate Site Location in Red Outline) ....................................... 16

TABLES

Table 1 Site Reference Information .............................................................................................................. 6

Table 2 Summary of Potential Sources of Flood Risk .................................................................................... 8

Table 3 Peak Flood Level at Model Node TWWBCS24 ................................................................................. 9

Table 4 NRW Flood Zones ........................................................................................................................... 16



1.0 INTRODUCTION

This Flood Consequence Assessment (FCA) report has been prepared by Hydrock Consultants

Limited (Hydrock) on behalf of Darnton B3 in support of a Planning Application to be submitted

to Rhondda Cynon Taff County Borough Council for a proposed development on land formally

occupied by the Taff Vale shopping precinct site (now demolished), on Taff Street, Pontypridd.

The report aims to address the requirements of Technical Advice Note 15: Development and

Flood Risk (TAN15) and Natural Resources Wales (NRW) policy, through justifying the location of

the proposed development and assessing the identified flooding consequences. This report

considers these requirements through:

Assessing whether the proposed development is likely to be affected by flooding.

Assessing whether the proposed development is appropriate in the suggested location.

Detailing any measures necessary to mitigate any flood risk identified, to ensure that the

proposed development and occupants would be safe and that flood risk would not be

increased elsewhere.



2.0 SITE INFORMATION

2.1 Location

The site is located between Taff Street to the west, the Maues Parcio Gas Road Car Park to the

south, the right/west bank of the River Taff to the east, and the historic footbridge and A4223

(Bridge Street) road bridge immediately upstream to the northeast.

The site location is shown in Figure 1 and in Appendix A, with full address and Ordnance Survey

Grid Reference provided in Table 1.

Table 1 Site Reference Information

Site Address

Taff Street, Pontypridd, CF37 4TR

Grid Reference 307329,190387 ST073903

Figure 1 Site Location

Site Location



2.2 Existing Land Use

The site was previously occupied by the Taff Vale Shopping Precinct. The site has now been

cleared for future development and all that remains are the concrete slabs and other areas of

hardstanding.

The original site layout is shown on the Topographical Surveys in Appendix B.

2.3 General Topography

The site levels generally fall from approximately 60m AOD in the northwest and 59m AOD in the

southwest to approximately 53.5m AOD in the northeast and 54.5m AOD in the southeast of the

site before a steep bank down to the right/west bank of the River Taff.

The Topographical survey of the site is included in Appendix B.

2.4 Proposed Development

The proposed scheme comprises the redevelopment of the site to provide three new office and

commercial use blocks, a basement carpark, highway improvements to the Crossbrook Street

and new, street level, public open space.



3.0 SOURCES OF FLOOD RISK

The following section assesses the potential flood risk to the site from various sources. A

summary of conclusions from this assessment are given in Table 2.

Table 2 Summary of Potential Sources of Flood Risk

Potential Source of Flooding Overall Risk

Fluvial Ranging from Low to potentially High

Tidal Negligible

Surface Water Low

Groundwater Medium

Sewer Low

Infrastructure Failure Low

3.1 Fluvial Flooding

The site lies with the right bank of the River Taff along its eastern boundary which flows in a

southerly direction to its confluence with the Rhondda River approximately 400m south of the

site before flowing onwards to Cardiff and out into the Severn Estuary. NRW Flood Mapping

(Figure 2) shows eastern portions of the site to be within Flood Zone 3 (high risk) and Flood Zone

2 (medium risk), while the west of the site is within Flood Zone 1 (low risk). The Flood Zones are

defined as follows:

Flood Zone 1 (no colour) comprises land assessed as having a ≤0.1% Annual Exceedance

Probability (AEP) of fluvial or tidal flooding in any given year, equivalent to the 1 in

≥1,000 year return period event.

Flood Zone 2 (light blue) comprises land assessed as having a 0.1-1% AEP of fluvial or

0.1-0.5% AEP of tidal flooding in any given year, equivalent to the 1 in 1,000-100 or 1 in

1,000-200 year return period event respectively.

Flood Zone 3 (dark blue) comprises land assessed as having a ≥1% AEP of fluvial or ≥0.5%

AEP of tidal flooding in any given year, equivalent to the 1 in ≤100 or ≤200 year return

period event respectively.

The Welsh Government Development Advice Mapping in Section 5.0 and Table 4 is based on this

fluvial flood risk.



Figure 2 NRW Fluvial and Tidal Flood Map (Approximate Site Location in Red Outline)

Source: NRW

The mapping is understood to be based on the River Taff Flood Risk Mapping Update Study in

November 2007, which is a one dimensional (1D) ‘channel only’ ISIS model. Modelled flood

levels taken from the Study adjacent to the site are summarised in Table 3 below.

Table 3 Peak Flood Level at Model Node TWWBCS24

Return Period (AEP) Peak Flood Level (m AOD)

1,000yr (0.1%) 56.446

100yr (1%) + 20% CC 55.768

100yr (1%) 55.528

Source: NRW

3.1.1 Pontypridd Flood Alleviation Scheme

The Pontypridd Flood Alleviation Scheme (FAS) undertaken in 1992/3 constructed flood

defences at the site following extreme historic flooding (see Section 4.0), and this significantly

reduces the fluvial flood risk posed to the site. The scheme included a flood defence wall,

substation defences, a formal earth embankment and formal wall defences that provide

protection from the River Taff to 56.679m AOD. This therefore provides protection to the site in

excess of the 0.1% (1,000yr) AEP level, effectively ‘re-classifying’ the site as Flood Zone 1 (low

risk).



This work was carried out in conjunction with improvements to the sewer and highways

drainage (CC, 2009, Section 4.2.1 Flood Defences, p11).

3.1.2 Hydrological Review and Pontypridd River Taff Bridges

At the time of writing, Hydrock has obtained the ISIS 1D hydraulic model of the River Taff from

NRW, and are in the process of linking this to a two dimensional (2D) TUFLOW model, the results

of which, when available, will be provided as an update to this report. This will include the

following:

Revised 1% (100yr) AEP and 0.1% (1,000yr) AEP design maximum events (based on

updated hydrometric datasets and hydrological modelling techniques).

Revised climate change allowances for the 1% (100yr) AEP event.

Flood hazard mapping results (based on maximum flood depths and velocities).

Two bridges cross the River Taff in the centre of Pontypridd immediately upstream of the site

(Figure 3):

An upstream clear span ‘Old Bridge’ that was constructed in 1756 and includes three

cylindrical voids on each side to reduce the weight and pressure on the crown after

several previous bridges were either washed away or collapsed due to vehicle vibrations.

This bridge is still in operation today, though only for foot traffic.

The steepness of the old bridge meant that it was difficult for horse carts to cross, and

subsequently a downstream triple arch ‘Victoria Bridge’ was constructed in 1857. Bridge

Street crosses this bridge.

Flood levels in the River Taff adjacent to the site during high flow events are likely to be

controlled, to an extent, by the two stanchions and lower soffit of the downstream Victoria

Bridge. This bridge (and not the Old Bridge which is unlikely to have the same impact) is included

in the hydraulic model. Any major blockage of the arches to the Victoria Bridge is likely to reduce

predicted design flood levels at the site (if at all), and Hydrock are in the process on confirming

with NRW that blockage analysis is therefore not necessary in this situation.



Figure 3 View Downstream from Right/East Bank, North of Site

By Chris Andrews, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=47229779

3.2 Tidal Flooding

The site is significantly elevated above sea level (>50m AOD) and due to its geographical location

is at negligible risk of flooding from this source.

3.3 Surface Water Flooding

Surface water flooding occurs as the result of an inability of intense / prolonged rainfall to

infiltrate to ground. This often happens when the maximum soil infiltration rate or storage

capacity is exceeded, or in urban areas as a result of man-made impermeable surfaces. Such

flows either drain into existing land drainage features or follow the general topography which

can concentrate flows and lead to localised ponding / flooding.

A simplified rainfall run-off model has been used to determine the surface water flood risk in the

NRW mapping (Figure 4). This modelling does not fully take into account urban drainage

networks nor does it differentiate the risk from watercourses (which is considered a fluvial risk

and addressed in Section 3.1). The Surface Water Map shows the majority of the site is at a very

low risk, with only a small area in the southeastern corner of the site predicted to be at a low to

medium risk from this source. However, this area appears to be hydraulically connected to the

River Taff, and so is considered a fluvial flood risk issue. Consequently, the whole site is

considered to be at a very low risk of surface water flooding.



Figure 4 NRW Surface Water Flooding (Approximate Site Location in Red Outline)

Source: NRW

3.4 Groundwater Flooding

British Geological Survey mapping shows the site to be underlain by Alluvium superficial

deposits comprising Clay, Silt, Sand and Gravel, which overlie the Brithdir Member, comprising

Sandstone.

The site is not at specific risk of groundwater flooding from higher ground, and any rainfall in the

surrounding area is likely to be intercepted by urban drainage networks rather than infiltrating

to ground. However, given that the east of the site is categorised as Flood Zone 3, groundwater

levels in this area could potentially be comparable to channel water levels and as such these

areas may experience a high water table (i.e. close to the surface) even if the site is not affected

by fluvial flooding. Measures to address this risk are included in Section 5.2. There is

consequently considered to be a potentially medium risk of groundwater flooding to the site.

3.5 Sewer Flooding

There is no specific mention of sewer flooding at the site or in Pontypridd in the Strategic Flood

Consequence Assessment (SFCA) (SW, 2008). Furthermore, with relatively recent improvements

to the local sewers and highways drains (see Section 3.1.1), the site is concluded to be at a low

risk of flooding from this source.



3.6 Infrastructure Failure Flooding

The site is shown by NRW’s ‘Risk of Flooding from Reservoirs’ mapping (Figure 5) to be within an

area at risk from this source. This is however understood to be a ‘worst case’ scenario, and it is

unlikely that any actual flooding would be this extensive. Furthermore, the upstream reservoirs

that potentially could give rise to this risk (the Beacons, Cantref, Neuadd, Pentwyn and

Pontsticill Reservoirs) are subject to a rigorous inspection and maintenance regime, and as such

this risk is considered as residual and acceptable. There is no known risk of flooding from any

other artificial source and so the site is concluded to be at low risk of flooding from

infrastructure failure.

Figure 5 NRW Reservoir Flooding (Approximate Site Location in Red Outline)

Source: NRW



4.0 HISTORIC FLOODING

A desk based search for flooding in Pontypridd reveals a substantial record of historic events,

dominated by fluvial flooding from the River Taff:

Flooding in 1748 and one shortly after is understood to have washed away two bridges

(Skempton and Chrimes, 2002).

1989 (PCW, 2014).

December 1979, understood to have been approximately a 0.1% (1,000yr) AEP event

(CC, 2009).

1990 (CC, 2009).

December 2012, including a large earth embankment collapse (BBC, 2012).

January 2013 (ITV, 2013).



5.0 TAN15 AND THE PROPOSED DEVELOPMENT

5.1 Planning Policy Requirements

The site is demonstrated in Section 3.0 to be potentially at high risk of fluvial flooding from the

River Taff, and at medium risk of groundwater flooding, but at a low risk of flooding from all

other sources. The Welsh Government Development Advice Map (Figure 6) shows the site to be

within Flood Zone B and Flood Zone C1. These flood Zones are defined in Table 4.

The proposed development is considered ‘less vulnerable’ with respect to flood risk (Welsh

Government, 2004, Figure 2, p7). There is consequently a need for the proposed scheme to

meet the requirements of the Justification Test as advocated within TAN15 (WG, 2004, Section 6

‘Justifying the location of the development’, p8).

In this instance, the proposed scheme is considered to meet the requirements of the

Justification Test, through:

The Rhondda Cynon Taff County Borough Council state that the Local Development Plan

supports ‘the regeneration of Pontyridd by providing a policy context that encourages

new residential and commercial development within the town centre’ (RCTCBC, 2011,

p98).

The site comprises ‘previously developed land’.

The consequences of potential flooding are also considered acceptable, subject to the

application of flood resistance measures to mitigate residual risk, registration of NRW’s

Flood Warning Service, and, application of Flood Emergency Plan measures discussed

further in Sections 5.2, 5.3 and 5.4 respectively.



Figure 6 Development Advice Map (Approximate Site Location in Red Outline)

Source: Welsh Government

Table 4 NRW Flood Zones

Description Zone

Considered to be at little or no risk of

fluvial or tidal/coastal flooding

A Used to indicate that justification test is not applicable and no need

to consider flood risk further

Areas known to have been flooded

in the past evidenced by

sedimentary deposits.

B Used as part of a precautionary approach to indicate where site

levels should be checked against the extreme (0.1%) flood level. If

site levels are greater than the flood levels used to define adjacent

extreme flood outline there is no need to consider flood risk further

Based on Environment Agency

extreme flood outline, equal to or

greater than 0.1% (river, tidal or

coastal)

C Used to indicate that flooding issues should be considered as an

integral part of decision making by the application of the justification

test including assessment of consequences.

Areas of the floodplain which are

developed and served by significant

infrastructure, including flood

defences.

C1 Used to indicate that development can take place subject to

application of justification test, including acceptability of

consequences.

Areas of the floodplain without

significant flood defence

infrastructure.

C2 Used to indicate that only less vulnerable development should be

considered subject to application of justification test, including

acceptability of consequences. Emergency services and highly

vulnerable development should not be considered.

Source: TAN 15 (WA, 2004, p5)



5.2 Flood Resistance

As explained in Section 3.4, during periods of prolonged rainfall and high flows along the River

Taff, groundwater levels in the area are likely to be comparable to those within the adjacent

channel. Noting the 0.1% (1,000yr) AEP peak flood level of 56.44m AOD it is recommended that

the basement level include tanking walls with an impermeable membrane to discourage the

residual risk of any groundwater ingress.

The following further flood resistance measures are also recommended at this basement level:

Services be brought in at a high level, and sockets/sensitive equipment etc. set at the

highest levels practicable.

An emergency sump pump(s) installed at the lowest point(s) within the basement.

A threshold entrance level for vehicular access to the basement be set no lower than

the 0.1% design flood level of 56.44mAOD.

A passive flood door be fitted to the sub-station in the southeastern corner of the

basement, so that this room can be sealed if required.

All ground floor building finished floor levels should, where practicable, be elevated a minimum

of 150mm above immediately surrounding ground levels to ensure any design exceedance flows,

should they occur, are directed away from any buildings (in line with best practice).

5.3 Natural Resources Wales Flood Warning Service

NRW operates a free Flood Warning Service that can be accessed and registered for by phone,

text or email alerts online at: https://naturalresources.wales/flooding/sign-up-to-receive-flood-

warnings/.

Current flood warnings can be viewed directly at:

https://naturalresources.wales/flooding/check-flood-warnings/.

NRW also operates a hydrometric river level gauging station at the Old Bridge (upstream of the

site and confluence with the Rhondda) which can be viewed at:

http://rloi.naturalresources.wales/ViewDetails?station=4220.

5.4 Flood Emergency Plan

Given that the site is within a wider area that may experience flooding it is recommended that

occupiers register with NRW’s Flood Warning Service, and consider evacuating the basement

and ground floor upon receipt of a flood warning, which are issued between half an hour and

one day in advance of potential flooding.

Even if there is no immediate risk to the site, local news and weather reports should be

monitored to check for disruption to transport infrastructure in the local area.

https://naturalresources.wales/flooding/sign-up-to-receive-flood-warnings/

https://naturalresources.wales/flooding/sign-up-to-receive-flood-warnings/

https://naturalresources.wales/flooding/check-flood-warnings/

http://rloi.naturalresources.wales/ViewDetails?station=4220



Further details for emergency planning at the site can be found at:

http://www.rctcbc.gov.uk/EN/Resident/EmergenciesSafetyandCrime/Emergencyplansforfloodin

g.aspx.

http://www.rctcbc.gov.uk/EN/Resident/EmergenciesSafetyandCrime/Emergencyplansforflooding.aspx

http://www.rctcbc.gov.uk/EN/Resident/EmergenciesSafetyandCrime/Emergencyplansforflooding.aspx



6.0 CLIMATE CHANGE

The impacts of climate change on peak rainfall determination have been considered in the

Surface Water Drainage Strategy and will be considered in the proposed River Taff hydrological

review (which will be included in the proposed update to this FCA report discussed in Section

3.1.1).

6.1 Peak Rainfall Intensity

Contingency for the impact of climate change on peak rainfall intensity has been taken as 30% in

accordance with TAN15 (WG, 2004, Section 2.5, p2) and this is considered in a separate report

by Hydrock (Hydrock, 2017b).

6.2 Peak River Flow

Consideration of the impact of climate change on the River Taff 1% (100yr) AEP peak flow will be

included by applying a 25% increase to flow (based on the River Severn catchment) in

accordance with NRW’s Technical Guidance: Flood Estimation (NRW, 2016b, p3).



7.0 DRAINAGE

A surface and foul water drainage strategy is included in a separate report by Hydrock (Hydrock,

2017b). It is recommended that this document be reviewed in conjunction with this report.



8.0 ENVIRONMENTAL PERMIT FOR FLOOD RISK ACTIVITIES

The River Taff through Pontypridd is designated ‘Main River’ and development extends to

within 8m of the right bank. As such a NRW Environmental Permit for Flood Risk Activities

(FRAP) is likely to be required for any works proposed within this easement. The submission of

this Permit is outside the scope of this FCA and more information on this can be found at:

https://naturalresources.wales/apply-for-a-permit/flood-risk-activities/.

https://naturalresources.wales/apply-for-a-permit/flood-risk-activities/



9.0 SUMMARY

This Flood Consequence Assessment (FCA) report has been prepared by Hydrock Consultants

Limited (Hydrock) on behalf of Darnton B3 in support of a Planning Application to be submitted

to Rhondda Cynon Taff County Borough Council for a proposed development on the site of the

former Taff Vale Shopping Precinct, Pontypridd. The report findings can be summarised as

follows:

The site was previously the Taff Vale Shopping Precinct, but has now been cleared for

future development. All that remains are the concrete slabs and other areas of

hardstanding.

The proposed development consists of the redevelopment of the site to provide three

new office and commercial use blocks, a basement carpark, highway improvements to

the Crossbrook Street and new, street level, public open space.

Whilst the majority of the site is within Flood Zone 1 (low risk) of fluvial flooding, there

are areas within Flood Zone 2 (medium risk) and Flood Zone 3 (high risk) of the River

Taff, which poses the principle flood risk to the site. There is a medium risk of

groundwater flooding, but a low risk from all other sources.

Flood defences constructed prior to and as part of a 1992/3 Pontypridd Flood Alleviation

Scheme provide protection from the River Taff to a level of 56.679m AOD, above the

0.1% (1,000yr) AEP, effectively ‘re-classifying’ the site as Flood Zone 1 (low risk).

Modelling of the River Taff to take account of revised climate change allowances

introduced in December 2016 is in progress and an update to this report will include a

hydrological review and revised hydraulic modelling to address this change in policy.

There is a long record of flooding in Pontypridd, the latest high flow event understood to

be in January 2013.

Welsh Government Development Advice Maps show the site to be within Flood Zone B

(areas known to have flooded in the past) and Flood Zone C1 (high risk but benefitting

from defence infrastructure). The proposals are considered to meet the Justification

Test, and the consequences of potential flooding are also considered acceptable.

Notwithstanding, it is recommended that the basement includes flood resistance

measures to mitigate residual risk of defence failure.

Given that the site is within a wider area that may experience flooding during more

extreme events, it is recommended that future users register with the NRW’s Flood

Warning Service.

Climate Change, in accordance with Welsh Government and NRW guidelines, is

considered in the separate Drainage Strategy and is currently being modelling for

inclusion, when available, within a proposed FCA update.

A Surface and Foul Water Drainage Strategy has been prepared for the site and this is

detailed in a separate report by Hydrock.



Any works within 8m of the top of bank will likely require a NRW Environmental Permit

for Flood Risk Activities (FRAP).

It is concluded that the Application meets the requirements of TAN15 and Welsh Government

planning policy.

Hydrock Consultants Limited



REFERENCES

Author Date Description

Atkins Nov 2007 River Taff Flood Risk Mapping Update Addendum Report

for Environment Agency Wales

BBC Dec 2012 Flooding: Residents in Pontypridd escape wall collapse

(available at http://www.bbc.co.uk/news/uk-wales-

20832825)

Cascade Consulting May 2009 Riverside Shopping Centre, Pontypridd Flood

Consequence Assessment Final Report Taff Vale Ltd.

Centre for Ecology and

Hydrology (CEH)

2009 The Flood Estimation Handbook CD-ROM 3. Centre for

Ecology & Hydrology, Wallingford, Oxon, UK.

Hydrock Consultants Ltd. May 2017a Flood Risk Review (Ref. 05366-HYD-XX-XX-CO-G-6000 P1)

Hydrock Consultants Ltd. May 2017b Surface and Foul Water Drainage Strategy (Ref. TVR-HYD-

00-XX-RP-S-000-Taff Vale Redevelopment-Drainage

Strategy)

ITV Jan 2013 Flash floods turned Pontypridd streets into rivers

(available at

http://www.itv.com/news/wales/update/2013-01-

27/flash-floods-turned-pontypridd-streets-into-rivers/)

Natural Resources Wales

(NRW)

May 2016a Good Practice Guide, Technical Guidance: Flood

Estimation, GPG 102 Hydrology and Water Resources

Management v1.0

Natural Resources Wales

(NRW)

Aug 2016b Flood Consequence Assessments: Climate Change

Allowances

People’s Collection Wales

(PCW)

Uploaded

Nov 2014

Flooding Pontypridd (available online at

https://www.peoplescollection.wales/items/399547)

Pontypridd Town Council Unknown History of Pontypridd

Rhondda Cynon Taff County

Borough Council (RCTCBC)

Mar 2011 Adopted Local Development Plan (available online at

http://www.rctcbc.gov.uk/EN/Resident/PlanningandBuild

ingControl/LocalDevelopmentPlans/LocalDevelopmentPl

ans.aspx)



Feb 2012 The History of the Old Bridge

http://www.bbc.co.uk/news/uk-wales-20832825

http://www.bbc.co.uk/news/uk-wales-20832825

http://www.itv.com/news/wales/update/2013-01-27/flash-floods-turned-pontypridd-streets-into-rivers/

http://www.itv.com/news/wales/update/2013-01-27/flash-floods-turned-pontypridd-streets-into-rivers/

https://www.peoplescollection.wales/items/399547

http://www.rctcbc.gov.uk/EN/Resident/PlanningandBuildingControl/LocalDevelopmentPlans/LocalDevelopmentPlans.aspx







Jan 2013 Local Flood Risk Management Strategy



Nov 2015 Flood Risk Management Plan, Volume 1

Ruddock, Ted 2008 Arch Bridges and their Builders 1735–1835, Chapter 5:

"The Theory of Arches and Pontypridd”

Scott Wilson (SW) Oct 2008 Strategic Flood Consequence Assessment for Rhondda

Cynon Taff

Skempton, A. W.; Mike

Chrimes

2002 A Biographical Dictionary of Civil Engineers in Great

Britain and Ireland: 1500 to 1830, p221-212

Welsh Government (WG) Jul 2004 Technical Advice Note 15: Development and Flood Risk

(TAN15)

Welsh Government (WG) Jan 2016 Planning Policy Wales Edition 8

www.hydrock.com

flood consequence assessment

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