Proposed Residential Development Alloa Park Phase 9
Flood Risk Assessment
March 2021
Dougall Baillie Associates 3 Glenfield Road, Kelvin, East Kilbride, G75 0RA P: 01355 266 480 F: 01355 221 991 E: [email protected] W: www.dougallbaillie.com
Dougall Baillie Associates Proposed Residential Development Alloa Park Phase 9 Flood Risk Assessment March 2021
© DOUGALL BAILLIE ASSOCIATES LIMITED
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Document Control
Document Title: - Proposed Residential Development Alloa Park Phase 9 Flood Risk Assessment
Project Number: - 20113
Project Title: - Alloa Rugby Club
Directory and File Name: - W:\20100s\20113 - Alloa Phase 9 (Rugby Club Site)\Admin\Reports\20113Rep02- Flood Risk Assessment.docx
Document Approval
Originator: Natasha Shaw Date: 22.03.21
Checked By: Nicholas Innes Date: 22.03.21
Authorisation: Scott MacPhail Date: .0223.21
Issue Date Distribution Comments
1 22.03.21 Allanwater Developments Draft for Comment
2 23.03.21 Allanwater Developments For Planning
Page | ii Dougall Baillie Associates Proposed Residential Development Alloa Park Phase 9 Flood Risk Assessment March 2021
CONTENTS
1 Introduction ...... 1
2 Baseline Conditions ...... 2
3 Flood Risk Assessment ...... 4
4 Summary and Conclusions ...... 10
Figure 2-1 – Location Plan ...... 2
Figure 3-1 – Black Devon 200 Year + Climate Change Flood Extents. Figure C 10 Fairhurst FRA dated May 2019 Document number 127102/G/W/01 ...... 5
Figure 3-2 – Brothie Burn 200 Year + Climate Change Flood Extents. Figure 2 Fairhurst FRA dated May 2019 Document number 127102/G/W/01 ...... 6
Figure 3-3 - Brothie Burn 200 Year + Climate Change Flood Extents. Figure 4 Fairhurst FRA dated May 2019 Document number 127102/G/W/01 ...... 7
Figure 3-4 - Pre and Post Mitigation flood depths ...... 8
LIST OF APPENDICIES
Appendix A – Proposed Development Masterplan
Appendix B - Topographic Survey
Appendix C – Culvert Blockage Mitigation Principles By Fairhurst
Appendix D – Culvert Blockage Overland Flood Flow Routing
Page | iii Dougall Baillie Associates Proposed Residential Development Alloa Park Phase 9 Flood Risk Assessment March 2021
1 Introduction
1.1 Dougall Baillie Associates (DBA) have been appointed by Allanwater Developments to prepare a Flood Risk Assessment in support of a planning application to Clackmannanshire Council for Phase 9 of residential development and the relocation of the existing Alloa Rugby Club playing pitches at the wider Alloa Park development to the south east of the town of Alloa.
1.2 The Flood Risk Assessment will discuss flood risk at the site and outline any mitigation measures required to ensure that the proposed development is not at an unacceptable risk of flooding and will not increase the risk of flooding elsewhere in accordance with current planning policy.
Relevant Guidance and Publications
1.3 To develop a meaningful Drainage Impact Assessment, the following legislative frameworks, guidance and documentation have been considered –
• Flood Risk Management (Scotland) Act 2009
• Scottish Planning Policy (Scottish Government 2014)
• Flood Prevention and Land Drainage (Scotland) Act 1997
• Planning Advice Note 69 (PAN69) – Planning and Building Standards Advice on Flooding (Scottish Executive 2004)
• Planning Advice Note 79 (PAN79) – Water and Drainage (Scottish Executive 2006)
• CIRIA C624 “Development and Flood Risk” (Construction Industry Research and Information Association 2004)
• SEPA Guidance “Technical Flood Risk Guidance for Stakeholders (Version 12)” (Scottish Environmental Protection Agency 2019)
• The Water Environment (Controlled Activities) (Scotland) Regulations 2011 (As Amended)
• SEPA Guidance “Climate Change Allowances for Flood Risk Assessment in Land Use Planning” (Scottish Environment Protection Agency 2019)
• CIRIA C753 “The SUDS Manual” (Construction Industry Research and Information Association 2015)
• Sewers for Scotland 4th Edition (Scottish Water October 2018)
Page 1 Dougall Baillie Associates Proposed Residential Development Alloa Park Phase 9 Flood Risk Assessment March 2021
2 Baseline Conditions
Site Description
2.1 The site forms an irregular plot of greenfield land associated with Alloa Rugby Club located to the south-east of the town of Alloa. The site is characterised by existing sports pitches, a club house, hardstanding area for car parking and open green space.
2.2 The site is bound to the north and west by Forth Crescent, to the east by phase 7 of development and the disused St Mungo’s Primary School and to the south by Phase 8 of development and existing residential properties associated with Earl’s Court. The proposed development site covers an area of approximately 9.3 hectares and is centred on National Grid Reference NS 89188 92190.
Figure 2-1 – Location Plan
Development Proposals
2.3 It is proposed to relocate the existing rugby pitches and provide 2 new grass pitches and a covered synthetic pitch in the western extent of the site. The relocation of the rugby pitches will then provide the land for 85 new units with associated roads and access, landscaping, open space, parking and supporting infrastructure. A copy of the proposed development masterplan is attached in Appendix A.
Topography
2.4 Review of the topographic survey of the site notes that the site is predominately flat in nature, with a slight fall to the south-west from the north across the site. The site high point is noted along the northern site boundary at a level of
Page 2 Dougall Baillie Associates Proposed Residential Development Alloa Park Phase 9 Flood Risk Assessment March 2021
7.6mAOD, with the low point noted to the south-west at a level of 6.0mAOD. A copy of the topographic survey for the site is attached in Appendix B.
Ground Conditions
2.5 A review of the British Geological Survey geology maps for the area was undertaken to determine the underlying geology of the site.
2.6 The maps suggest that the superficial deposits overlying the site consist of Raised Tidal Flat Deposits Of Holocene Age - Silt and clay. This sedimentary superficial deposit formed between 12 thousand years ago and the present during the Quaternary period.
2.7 The bedrock geology of the site was noted to consist of Passage Formation - Sedimentary rock cycles, clackmannan group type. This sedimentary bedrock formed between 318 and 328 million years ago during the Carboniferous period
2.8 It is recommended that ground conditions should be confirmed through a detailed site investigation report.
Existing Hydrological Regime
2.9 The development site falls within the natural drainage catchment of the Black Devon watercourse which passes the site approximately 400m to the south-east. The Black Devon originates approximately 17.4km to the east from runoff from the Cleish Hills.
2.10 The Black Devon is a tributary of the River Forth which it joins approximately 1.7km to the south ,however the River Forth is located approximately 500m to the south-west of the site at its closest point.
2.11 In addition to the open watercourses the Brothie Burn is culverted through the western extent of the development site, where the rugby pitches are to be relocated. The inlet to the culverted watercourse is located some 800m north of the site at Shillinghill roundabout. The culverted watercourse then works its way through the urban environment before discharging to the River Forth some 500m south west of the site adjacent to the Alloa Waste Water Treatment Works.
Page 3 Dougall Baillie Associates Proposed Residential Development Alloa Park Phase 9 Flood Risk Assessment March 2021
3 Flood Risk Assessment
Sources of Flood Risk
3.1 Current best practice recommends, and planning advice requires that all new developments should be free from significant flood risk from any source and should not materially increase the probability of flooding elsewhere. For the purposes of this report existing flood risk has been considered from the following sources –
• Coastal Flooding • Fluvial Flooding • Culvert Flooding • Pluvial Flooding and Overland Flows • Groundwater Flooding
Coastal Flooding
3.2 The development site is located some 500m from the River Forth, at its closest point. The River Forth along this reach is influenced by tidal interactions.
3.3 Information available from the SEPA Coastal Flood Boundary dataset predicts a 0.5% AEP tidal surge level in the River Forth in the Alloa Area of 4.8mAOD.The dataset notes that a freeboard of +300mm be used to allow for any inaccuracies in the predictions given a conservative 0.5%A.E.P surge level of 5.1mAOD.
3.4 SEPA guidance “Climate Change Allowances for Flood Risk in Land Use Planning” notes that a sea level rise allowance of 860mm should be applied for the Forth Estuary to take account of the impacts of climate change up to the year 2100. Taking account of this guidance the 0.5%A.E.P surge level is 5.96mAOD, this includes the 300mm freeboard allowance.
3.5 The lowest proposed floor level within phase 9 of the development is 7.4mAOD, some 1.4m above the conservative surge level. It is therefore considered that due to a combination of plan distance and vertical separation from the flood source that the site is not at risk of coastal flooding.
Fluvial Flooding
3.6 Fluvial flooding arises when the capacity of river channels are exceeded due to high flows, resulting in inundation of adjacent floodplains. The potential sources of pluvial flooding to the site are from the River Forth, Black Devon and culverted Brothie Burn.
3.7 Flooding from the River Forth has been considered above in the coastal flooding section, in which it is concluded that the site is not at risk of flooding from the River Forth. No further assessment of flood risk from the River Forth is therefore required.
3.8 Flooding from the culverted Brothie Burn is considered in the following section
Page 4 Dougall Baillie Associates Proposed Residential Development Alloa Park Phase 9 Flood Risk Assessment March 2021
of the report under culvert flooding.
3.9 In support of the planning application for Phase 8 Allanwater Developments appointed Farihurst to prepare a Flood Risk Assessment. This assessment was prepared in May 2019.
3.10 Within the Fairhurst FRA 2D modelling of the Black Devon was undertaken to quantify the risk of flooding from this source to phase 8. The modelling concluded that phase 8 was not at risk of fluvial flooding from the Black Devon under a 0.5%A.E.P (61.3m3/s) and 0.5%A.E.P +CC event (73.6m3/s) with a flood level of circa 4.5mAOD as per figure 3-1 below.
Figure 3-1 – Black Devon 200 Year + Climate Change Flood Extents. Figure C 10 Fairhurst FRA dated May 2019 Document number 127102/G/W/01 3.11 Phase 8 is located between the current proposed Phase 9 of development and the Black Devon. Furthermore the lowest proposed Finished Floor Level in Phase 9 is 7.4mAOD, some 2.9m above the flood level in the Black Devon.
3.12 It is therefore considered that the development is not at risk of fluvial flooding from the Black Devon.
Culvert Flooding
3.13 Within the 2019 Fairhurst FRA prepared for Phase 8 modelling of the Brothie Burn culvert was undertaken to quantify the risk of flooding to the development.
3.14 The major influence in watercourse and culvert hydraulics of the Brothie Burn as it flows through Alloa and the western extent of the development site is the culvert inlet adjacent to Shillinghill Roundabout.
Page 5 Dougall Baillie Associates Proposed Residential Development Alloa Park Phase 9 Flood Risk Assessment March 2021
3.15 The modelling found that under normal operating conditions for the 200 year event + CC event there was some flooding of the culvert inlet at Shillinghill Roundabout, however no risk of flooding to Phase 8 and 9 of development.
Figure 3-2 – Brothie Burn 200 Year + Climate Change Flood Extents. Figure 2 Fairhurst FRA dated May 2019 Document number 127102/G/W/01 3.16 Further analysis was carried out to establish what the impacts of culvert blockage or failure would have on Phase 8 of development. This analysis found that for a culvert inlet blockage of greater than 70% then overtopping of the Shillinghill Roundabout occurs. Once this happens flows then follow the topographic profile of the area and flow south towards and through Phase 8 and Phase 9 of the development site.
Page 6 Dougall Baillie Associates Proposed Residential Development Alloa Park Phase 9 Flood Risk Assessment March 2021
Figure 3-3 - Brothie Burn 200 Year + Climate Change Flood Extents. Figure 4 Fairhurst FRA dated May 2019 Document number 127102/G/W/01 3.17 The inlet to the culvert at Shillinghill Roundabout is maintained by Clackmannanshire Council and is inspected on a regular basis. The likelihood of a blockage greater than 70% occurring at the same time as the 0.5% A.E.P event is therefore considered extremely low.
3.18 Under the 100% culvert blockage event shown above in figure 3-3 the flooding has the greatest impact on the western extent of phase 9, where the relocated rugby pitches are proposed.
3.19 The relocation of the rugby pitches requires the reprofiling of the surface levels to provide a suitable playing surface. The reprofiling provides an opportunity
Page 7 Dougall Baillie Associates Proposed Residential Development Alloa Park Phase 9 Flood Risk Assessment March 2021
to channel and convey the flood flows under the extremely unlikely 0.5% A.E.P event plus 100% culvert blockage. This provides the opportunity to avoid overland flows from impacting on phase 8 and 9 of development but would also reduce the risk to existing neighbouring properties.
3.20 Fairhurst outlined preliminary principles of the regrading works for the rugby pitches in addition to raising an existing road junction, providing a continuous flood bund along the boundary with the existing properties in Earl’s Court and a flow conveyance channel to the Black Devon.
3.21 Preliminary modelling of these upgrades was also undertaken, see figure 4-3 below. A larger copy of figure 4-3 is also attached in Appendix C. The modelling notes a reduction in offsite flooding and also no impact on Phase 8 or 9 of development. The modelling notes a flood depth of 250mm adjacent to Phase 9 of development.
Figure 3-4 - Pre and Post Mitigation flood depths (Fairhurst) 3.22 As part of the phase 9 planning application DBA have taken the modelling principles outlined by Fairhurst and developed these into design drawings to form part of the planning application. The plans are attached in Appendix D.
3.23 The pitch adjacent to Phase 9 of development slopes in level from 6.6mAOD to 6.05mAOD from north to south, this would give a maximum overland flood flow level of 6.85mAOD. The lowest proposed plot level in phase 9 is 7.4mAOD, some 650mm above the flood level and considered to be a suitable freeboard.
3.24 It is therefore considered that by implementing the mitigation works that Phase 9 will not be at risk of flooding in the event of culvert blockage or failure, whilst also reducing the risk of flooding to neighbouring properties.
Page 8 Dougall Baillie Associates Proposed Residential Development Alloa Park Phase 9 Flood Risk Assessment March 2021
Pluvial Flooding and Overland Flows
3.25 Pluvial flooding arises from rainfall generated overland flow prior to the overland flow being intercepted by a watercourse, sewer or other drainage network.
3.26 The general topography of the site and wider area is a fall south towards the River Forth. The land to the north of the development site is a residential area and is formally drained via a Scottish Water sewer network. Therefore there is limited potential for flows from the higher ground to the north to shed towards the development site.
3.27 Further more in order to facilitate gravity drainage of the site the ground levels of the site are being raised above existing levels. Therefore overland flows from external sources will not be able to flow into the site.
3.28 It is considered that the development site is not at risk of pluvial flooding or overland flows from external sources.
3.29 It is recommended that post development overland flow paths be clearly identified and given careful consideration during detailed design to ensure that development of the site does not generate any internal issues of pluvial flooding due to overland flows ponding in any low points within the new development.
Groundwater Flooding
3.30 Groundwater flooding occurs when the water table rises above the ground level. Groundwater is generally a contributing factor to flooding rather than the primary source.
3.31 Groundwater levels are generally in hydraulic continuity with nearby watercourses and considering the proximity of the site to the River Forth and Black Devon it is considered groundwater will in continuity with these features. A rise in river levels would result in a subsequent rise in ground water levels at the site. It has already be concluded that the site is not at risk of flooding from the River Forth or Black Devon and it is also considered that any subsequent rise in groundwater level will not impact the development site.
3.32 Groundwater levels will be confirmed as part of intrusive ground investigation works and any further recommendations made when this information becomes available.
Page 9 Dougall Baillie Associates Proposed Residential Development Alloa Park Phase 9 Flood Risk Assessment March 2021
4 Summary and Conclusions
4.1 In developing this Flood Risk Assessment for the proposed residential development located on land associated with Alloa Ruby Club to the south-east of Alloa, recommendations have focused on outlining a strategy to ensure that the development is not at an unacceptable risk of flooding and will not increase the risk of flooding elsewhere in accordance with current planning policy.
4.2 It has been concluded that the site is not risk at of coastal flooding due to a combination of plan and vertical distance from the flood risk.
4.3 It has been concluded that the site will not be at risk of fluvial flooding from the River Forth or the Black Devon due to a combination of plan distance and vertical separation from the watercourses.
4.4 Through hydraulic modelling undertaken previously by Fairhurst on behalf of AllanWater Developments it has been identified that under a 0.5%A.E.P event and a culvert inlet blockage of more than 70% that the western extent of the development site would be at risk of flooding from the resultant overland flow from the culverted Brothie Burn.
4.5 The relocation of the rugby pitches and associated reprofiling of the ground to provide a suitable playing pitch provides the opportunity to manage flood flows through the site under a culvert inlet blockage of greater than 70% scenario. Modelling of this principle notes that not only is the development site protected but a betterment is provided to the existing residential properties adjacent to the development site.
4.6 It is considered due to the presence of formal drainage network serving the built environment surrounding the site in combination with the topography of the area and site that the site is not at risk of fluvial flooding. It is recommended that post development overland flows are considered as part of detailed site design and that adequate drainage measures are implemented to ensure any risk of ponding within the developed site is prevented.
4.7 It is considered that the site is unlikely to be at risk of groundwater flooding due to the topography of the site relative to the main water features in the area which groundwater level is considered to be in hydraulic continuity with. It is however recommended that groundwater levels be confirmed as part of a detailed site investigation reporting for the proposed site.
Closing Conclusions
4.8 It is the conclusion of this report that, by implementing the recommendations outlined within; the proposed development at the site will not be at an unacceptable risk of flooding and will not increase the risk of flooding elsewhere.
Page 10 Dougall Baillie Associates Proposed Residential Development Alloa Park Phase 9 Flood Risk Assessment March 2021
Appendix A
Proposed Development Masterplan
HOUSE CLUB
House Existing parking Existing
Club surface upgraded surface
Pitch No. 2
Upgraded access Upgraded off future link future off 94x68m Gently graded ground Tabled junction Tabled junction v v
Shared Drive Shared Surface Existing access to rugby club only club rugby to access Existing 3 2 3 3 2 2 2 3
2
by others through third party ownership party third through others by
adoptable standards to facilitate future linkage future facilitate to standards adoptable This section of carriageway to be built to built be to carriageway of section This 82 81 2 86
85 Indicative bellmouth and access link. access and bellmouth Indicative 83 84 2 80 79 37
3m Flat area beyond pitch v Shared Surface 38 41 3 78 39 40 5.5m Road 2m path 2m path 36 34 3 2 3 42 77 3 3 3 35 Link Road 5.5 reducing to 3.7m 2
v Green space 43 76 3 Tabled junction 2+gar v
2 Shared Drive 75 44 3
2 45 2 v Tabled junction 2 2 Existing pitches 2
v Shared Drive v 30
2m path 31 32 33 3 2 27 26 46 2m path 5.5m Road 2m path 70 3 29 3 2 74 73 2 v 47 69 2 3 72 71 28 2 2 2 48 68
v 2 3 2 67
3 Forth Crescent Forth 49 3 2 3 Extended verge owned by Clackmannanshire Council Shared Surface 2
Shared Drive 2 2m Footpath along frontage 66 50 Tabled junction 2 v v Shared Surface 65 63 64 25 23 24 51 SUDS Basin 2 v 22 19 2 2 2 21 3 3 18 2 Tabled junction
v 3 Shared Surface 2 2 20 17 2 Shared Drive Development Phase 8 3m path 60 2 2 v 2 3 v 59 2 Green 62 space 61 52 2 2 53 3 58 v 2m path 5.5m Road 2m path 54 14 57 55 56 13 15 16 2 10 2
12 Footpath along frontage 2 2 v 2 3 2 3 11 2+gar Tabled
junction
Shared Surface v
Shared Drive v Green space Shared Drive 2 2 3 3 4 5.5m Road 3m path 7 2m path 2 2 2 3 1 v 2 3 3 5 6 9 8
Green space Green space Raised crossing point
Path/emergency3700 access Existing path pedestrian/cycle 3.7m wide path access emergency to serve as Bracewell Stirling PROPOSED HOUSING LAYOUT RUGBY FIELDS DWG No. PAPER SIZE: SCALE: STATUS: v ALLANWATER ALLOA PARK WEST 3m path 15 LOCHSIDE STREET, OBAN, PA34 4HP 38 WALKER TERRACE, TILLICOULTRY, FK13 6EF 5 NESS BANK, INVERNESS, IV2 4SF LEGEND: 1 : 500 0 FOR APPROVAL Demarcated visitor parking provision 3.7m pedestrian / cycle path capable of Pedestrian / cycle paths Shared surface road 5.5m core reducing to Raised table junctions in block paviours Principal road 5.5m with footpath both sides Boundary hedging 900 high post and rail fence 1800 high timber screen fence 1800 high wall and fence panels accommodating an emergency access. 3.7m contrasting block paviours with build outs reducing to 3.7m 4603-02-003 ROADS EXTERNALS 4DV129 ARISAIG 4 bed detached (int garage) 4DV122 CUILLIN 4 bed detached (int garage) 4DV111 Fintry 4 bed detached 4DV104 OCHIL 4 bed detached (int garage) 3DV101 SIDLAW 3 bed detached (dual frontage) 3DV98 CHEVIOT 3 bed detached (int garage) 3SV83 NEVIS 3 bed detached 3SV83 ARROCHAR 3 bed semi HOUSETYPES 1 : 500 10m
900mm slab path Bins A1 [3 parking spaces in curtilage 7x3 garage] [3 parking spaces in curtilage] [3 parking spaces in curtilage] [3 parking spaces in curtilage] [2 parking spaces in curtilage] [2 parking spaces in curtilage] [2 parking spaces in curtilage] [2 parking spaces in curtilage] N DATE: DRAWN: Clothes drying 20m Entrance Platt Patio CONSULTING TOTAL 01631 359054 01463 233760 01259 750301 30m REV. Mar 2021 G -- 86 16 24 14 2 7 8 7 8 Forth Crescent
Graded embankment 3m Flat area beyond pitch Existing parking 40
34 39 26 upgraded 33
New Rugby Grounds 36 35
27
38 32
29 28
37
31 Pitch No. 1 100x68m 30 3m Flat area beyond pitch Graded ground
85 CLUB HOUSE
84 43 41 42
77 76 75
Club House 83 44 45
46 48 47
69 82 70 1
81 78
Covered 25m x 50m 80 79 synthetic training pitch. 74 71 Green space Structure 30m x 55m 73 72 Graded ground
Pitch No. 2 3m Flat area beyond pitch 90x68m 3m Flat area beyond pitch Graded ground
- - - -
REV DATE DESCRIPTION DRN
Bracewell Stirling CONSULTING
38 WALKER TERRACE, TILLICOULTRY, FK13 6EF 01259 750301 5 NESS BANK, INVERNESS, IV2 4SF 01463 233760 15 LOCHSIDE STREET, OBAN, PA34 4HP 01631 359054
ALLOA PARK WEST RUGBY FIELDS ALLANWATER
N PROPOSED NEW RUGBY FACILITIES
STATUS: FOR APPROVAL SCALE: 1 : 500 DRAWN: -- PAPER SIZE: A1 DATE: Dec 2020 1 : 500 0 10m 20m 30m DWG No. 4603-02-002 REV. D Dougall Baillie Associates Proposed Residential Development Alloa Park Phase 9 Flood Risk Assessment March 2021
Appendix B
Topographic Survey
HARRIS COURT HARRIS
6.26 Telecom
6.01
6.10 6.15
5.96 6.00
G
5.89 6.75
5.83 5.95 5.93
5.89
6.01
LP 6.12 5.87
5.92 6.00 6.84
5.91
6.26 6.26
5.97 6.09
6.86
7.15 6.72
5.89 5.91 5.94
7.0 7.04 5.85
5.91
5.90 6.16 6.17
6.0 5.95 5.92 5.89 Telecom 5.87 5.95 5.87
5.92 6.15
6.22
6.77 6.00 6.38 6.35 6.38
5.75 6.0
6.03
5.98
6.67 5.89
6.38 Cobbles
Grass 6.41
5.82 6.28
6.05 6.54 5.95 6.43
5.90
BS 6.08
6.04 G
6.41
G
6.01
6.11 5.86
6.16 5.72 6.10
6.01 6.47 6.35
6.18 6.39 6.25
6.19 LP
6.57
6.18 5.90
5.83 5.86 6.62
5.89 6.0 6.42
5.85 5.94 5.84 5.80 5.90 5.81 5.97
5.99 5.99
G 6.05 6.03 6.20 6.06
6.62
5.86 6.12 6.37 LP
6.13
6.15 6.14
6.14 6.44
5.69 5.76
6.15 5.78 5.91
6.15 6.10
6.13
5.83 5.95
5.86
6.07
5.98
5.92
5.95
5.86 6.11
G
5.96 6.03 6.19
6.23 Tarmac Path 6.03 6.08 5.79 6.12 6.45
5.77 6.03 MH MH 6.26
5.84 6.04 6.05
MH 6.03 6.02
6.02
6.01 6.29 6.36
6.62 6.06
6.06 6.11
6.04 MH 5.80 6.18
SV 6.20 6.29 6.12
5.96 6.73
SV
MH
WT 6.25 WT
6.0 6.89 6.72 SV CRESCENT FORTH
6.07 5.81 MH
5.70
5.85 5.85
5.86 Grass
5.88
5.94
6.00 SV 5.83 6.36
6.14 6.00 SV
6.03 6.07
6.09
6.11
6.14
6.16
6.15 SV
6.13
6.17
5.94 6.73 6.20 6.22
6.19
6.18
6.18
6.22 SV
6.17 6.78
FORTH CRESCENT FORTH 6.50
6.70 6.23
6.07 7.0
EAST CASTLE STREET CASTLE EAST 6.22 7.01 6.74 6.39
5.91
6.10 6.79 6.72
7.09
6.23 6.78
5.85
5.83
5.86 5.84 5.87 5.86
5.88 6.58
G 5.94
5.98 5.99
6.01
6.03
6.03
5.89 6.02
6.03
6.68
5.94
6.04
6.03 6.02
5.96 5.93
5.87
5.94 LP 5.87 6.03
5.95 5.95
5.98 6.46
6.03 6.04
BS 6.06
6.83 6.04
LP 6.06
6.84
6.04 6.07
6.11 G
6.15 6.08 6.24
6.15
6.15
6.15 6.01
6.01
6.00 6.00
6.15
6.13
6.00 6.10
6.12
LP 6.10 6.13 6.15 6.10
6.69 6.14
6.14
6.14
6.71 6.18
6.22 6.65 7.0
G LP 6.71 6.31 6.80
6.22 6.11 7.03
Mk
LP
6.68
6.52 6.73 Brick Wall 6.68
6.25 6.69
6.76
6.15 6.69
6.67
6.36 6.56 6.72
6.70 6.66 6.86
6.30 6.70
6.79
6.44 6.20 6.60
6.09 6.59 6.88 6.36
6.60 G
6.40
6.46 6.33
6.10
6.46 6.69 6.96
6.27
6.05
6.22 6.64
6.52 6.39 6.75
6.33
6.52 6.92 6.46 6.68 6.86
6.91
G
6.66
6.76
6.0 G
7.0
7.0
6.18 6.44 7.0 7.0
6.07 6.54
IC
5.95 6.78
7.23 6.60
6.92
7.07 6.94 6.76 6.92 6.67
7.21 6.91 7.0 6.53
7.29 6.67
7.47
LP 7.0 6.64 6.81 Tarmac Path
6.71 Grass
6.55 6.87
6.94 6.74 6.67
6.97
6.97 7.05
6.69 G
6.89 6.14 6.0 7.76 6.77
6.60 7.71
6.71
5.81
7.0 7.99
LP 6.91
7.0 Telecom
6.92
5.90
MH 7.13
6.73
6.78
6.91 7.07
6.66 7.29
6.75 7.12
6.92 Telecom 6.80
7.0 7.0
6.0 6.77
7.64 7.25
6.69
6.85 6.88 7.22
5.86 7.0 7.55
6.88 5.70
6.0 6.98 7.0
6.83 7.09
7.0 6.79
5.67 6.0 5.99
5.86 7.0
7.19
Telecom 6.37
6.69 5.97
Stone wall 6.84
7.20
CTV 6.94
6.0
5.66 6.0
6.60 6.82
IC 6.24 6.89 6.78 6.75
7.01
6.90 6.95
G
6.75 6.77
6.77 6.72 6.80 6.67
6.81
6.13
6.52 6.87 6.86
6.75 6.84
6.60 6.86 6.85
6.85
6.84
G
6.77
6.73
7.0 6.69
SV
6.80
6.13
6.86
6.84 6.81
6.91
LP 6.89 Telecom
5.74 6.96
6.84
6.16 LP 6.0
6.92 6.79 6.85
6.76
6.85
5.77
6.83
6.86
7.01
6.94
6.93
6.85
5.70
6.95
6.67
6.84
6.01 6.97
5.72
7.0 7.02
Slabs 6.73
6.79 6.95
6.75 7.0
6.87
6.10
7.08
6.52 6.84
6.94
7.02
5.67 6.67
Timber Fence
5.98
5.79 5.99
6.78
6.78 6.69
6.79
6.91
6.97
6.34
6.79
6.0
6.92
5.69
MH
5.72
6.73
6.70
6.55
6.73
6.61
6.67
6.80
6.87
6.85
6.96
6.13 Garages
6.50 6.87
7.0
5.85
sign LP
Slabs
MH
5.81
6.65
6.51
6.64
IC
House
6.63
5.97
6.52
6.58
6.730
D1
6.68
G
6.72
Spread 10m Spread Trunk 0.6m Trunk
Slab Path Slab MH
Mk
6.65
6.69
6.55
5.78
6.64
6.73
5.99 6.75
6.56
6.22
6.65
Control
Cab.
6.34
6.46
6.45
G
6.85
5.97
6.98
6.74
G P/W Fence (dilap) Fence P/W
5.67 6.34
FH
5.70
Telecom
5.56 6.00
6.66
6.56
5.84 6.65
6.0 6.57
5.62 6.67
6.74 6.0
LP 6.60
6.0 6.19
5.90 6.55
5.89
6.67
6.71
7.0
5.50 6.01
6.64
6.57
6.50
6.84
6.21
6.33
6.66
FL
6.57
6.20
6.48
5.76
BH
Spread 18m Spread
Trunk 1.2m Trunk
6.66
Spread 14m Spread
Trunk 0.7m Trunk
5.53
6.58
6.68
6.54
6.72
7.02 6.58
Trunk 0.6m Trunk
Spread 6m Spread
6.03
6.53
7.0
7.02
6.66
5.97
6.59
6.93
6.43
6.60
6.67
Spread 12m Spread
Trunk 1.2m Trunk
5.87 6.62
6.0
6.59
Trunk 0.8m Trunk
5.63 6.69
Spread 7m Spread
6.74
Spread 10m Spread
Trunk 1.0m Trunk
7.07
7.01
5.69
5.60
6.07
FL
7.48
6.30
6.68
6.67
6.69 6.61
7.0
BS 6.22
7.25
6.69
6.0 6.93
6.90
6.59
6.84 6.76
6.70
6.98
5.65
Trunk 0.8m Trunk
Spread 8m Spread
6.85
MH
Trunk 0.7m Trunk
Spread 8m Spread
6.95
6.69
WT
6.62
Hump
Speed
6.05
6.71 Hump
6.42 WT Speed 5.92
7.0
6.61
6.76
6.71
6.13
6.74
LP
7.0
6.72
6.64
6.72
6.20 6.12
FORTH CRESCENT FORTH
6.62
6.75
6.86 6.71
6.24
6.60
6.79
6.66 7.09
6.86 WT
6.74
6.45 6.75
6.01
6.76
6.67
6.73
6.83
6.80 6.74
6.77
6.62 5.96
6.77
6.73
G
5.97
7.31
6.0 6.79 Tank
6.77 6.87
5.53
6.67
6.81
6.69
7.37
6.68
7.0 6.68 6.75
6.71 6.59
6.75
6.68 Container
6.80 6.62
6.75
6.74
6.62
G
MH Container
6.77
6.39
6.71
6.75
6.74 6.89
6.75 6.82
6.72
6.74
6.91
MH
6.78
6.62
6.65
6.76 6.65
6.81
7.15
6.80
Spread 13m Spread
Trunk 0.8m Trunk
6.83 6.74
7.0
6.80 6.69
7.0
6.84
6.68
6.78
Clubhouse
6.83
6.68
6.78
P/W Fence P/W
6.93
6.82 6.80
6.74 6.67 6.77
6.85 6.64 6.65
6.62 6.0
6.65
6.62 6.81
6.77 6.82 5.84 6.81
Gravel/ Broken Concrete Broken Gravel/ 6.68
6.84 5.87
LP 6.69 MH
6.35
6.91 Concrete 6.89
6.30 6.86
6.85
6.77
SV
6.90
6.59
WT
SV
MH
6.18
6.76
6.21 6.81
MH
6.49
6.06
6.27 6.74 6.08 6.71 6.80
ACO Drain Mk LOMOND COURT
6.84 6.82
6.81
6.92 6.89
6.86
6.88 6.87
6.89
Tactile
6.89
7.0 6.95
6.57 7.00
6.89
6.85
6.96
G
6.95
6.46 7.01
6.38
6.65 6.90
6.82 6.99
6.55 7.07
6.62
6.90
7.06
6.77
6.93 G 6.87
6.0
Slabs
7.07
6.60
BS
6.68
7.04
6.73
6.93
6.94
7.02
6.95
6.98
7.0 7.14
6.97
6.45 6.16
6.52 6.89
6.67 6.58
7.0
6.64
6.73
7.05
6.62 6.19
6.96
7.04
6.11
6.99
Goal Posts Goal
6.97
7.09 6.03
6.98 7.01
6.92
7.0 5.89
7.18
6.60 7.08
6.36
telecom
6.67
Playing Field Playing
5.82
7.20 7.11
7.03
6.67
6.81
7.10
7.04
7.20 7.13 6.57
7.16
6.62
6.55
6.53
Telecom
7.03
6.61 7.11 7.12
7.15 7.08 Sign 7.05
7.04 7.11
7.15 7.08
7.15
7.04
7.12
7.04
6.71
6.0
6.74
LP
6.63
7.02
7.12
Grass
7.14
6.54
7.18
7.18
6.67 Hump
Speed
7.00
7.28
6.54
Hump
Speed
7.13
7.14
7.06
6.52
6.65
7.13
E/R
7.19
6.56
6.50
6.66
7.01
7.12
Control Cab.
7.0
7.15 7.21
6.83
7.14 7.04 7.07
7.13 7.13
7.24
6.50 7.23
7.06 7.24
7.12
6.59
5.93
6.09
6.68
6.75
6.61
6.52
6.04
7.04
7.07
7.14
7.03
7.15
7.24 7.25
5.82
7.14
7.16
6.10
6.05
6.56
G
6.66
6.69
7.18
6.48
6.93 7.06
7.25
6.0
MH
6.53
6.41
7.25 7.17
7.06
7.16
6.79
7.08
7.17
6.57
MH
7.27
7.26
7.36
6.65
7.22
7.19
7.01
7.09
6.46 Post Goal
7.17
6.82
6.60 pitch of Extent
6.56
7.09
7.16
6.65
7.27
7.30
6.50
6.92
7.19
7.10
MH
6.50
7.20
6.46 7.19
7.18
7.28
6.0 6.22
7.0
6.00
7.30
7.12
6.35
6.92
6.35
Mk
6.33
7.20
7.11
6.54
7.26 7.20 7.21
7.18
6.64 7.14
LP
7.26
7.24
7.30 7.14
7.31
WT
7.05
7.25
MH
6.50
7.34 7.33
7.37
6.29
7.23
6.81
7.14
6.58
7.22
6.67
6.41
7.14
7.26
6.53
6.96
7.34
6.49
7.26
7.27
7.18
Spread 20m Spread 6.93
Trunk 1.3m Trunk
7.23
7.13
7.28
6.68
7.34
6.58
6.99
G
7.28
7.19
6.46
G
7.26
6.24
6.95
7.18
7.29
7.36
6.85
6.24
6.64
6.76
7.29
7.21
6.25
6.45
7.25
7.28
6.08
7.23
7.31 7.38
7.0
6.54
7.01
6.40
6.97 7.31
7.24
6.69 6.44
7.0 Mk
6.34
7.31
6.50
7.37
7.26
7.33
FH
6.31
6.48
7.00
6.35
7.29 7.34
7.27
6.70
6.44
6.39
7.35
7.36 6.40
7.28
7.34 6.80
7.43
7.37
7.30
6.89 7.00
7.33
7.34
6.44
6.53
6.46
7.33 7.41
7.49
7.43 LP
7.34 6.33
7.38 Tactile 7.39
7.49 7.32
6.37 7.36
7.36 6.60
7.39
6.34
6.47 6.41
6.52 7.35 7.47 6.74
6.98 7.48 7.41
7.0 7.38
7.34
7.41
7.41 6.48
7.39 RANNOCH COURT
6.56
6.87
7.36
6.54
7.41
7.06
SV
6.47
MH 6.52
SV
SV 6.54
Goal Posts Goal
7.49
6.28
7.33
7.44
7.34
6.34 7.47
7.36
7.44
7.46
6.65
7.35
7.47
6.39
6.53
6.51
7.39 7.36
7.54
6.49 7.42
7.47 7.36
7.52
MH
6.79
7.36
7.47 7.49
7.35
7.48
7.49
Playing Field Playing
6.61
6.95
G
7.41
6.58
7.49
6.94
7.54
6.55
6.98
6.41
6.24
G
6.33
6.70
7.48
7.41
7.32
6.41
6.42
7.51
Mk
6.60
7.41
7.52 7.60
7.0
6.46
6.67
7.52
7.45
6.80
7.52
6.95
7.44
7.56
7.63
6.87
6.44
6.53
6.27
7.04
6.49
6.35
7.56
7.49
7.50
6.76
7.53
6.41
7.46
7.60
6.45
7.67
Hump
6.51
Speed
Hump
LP
Speed
6.64
6.41
6.68
7.56
7.66
7.48
7.54
6.43
7.50
7.58
6.79
6.89
6.26
7.00
Telecom
Goal Post Goal
6.95
6.29
IC
6.67
6.32
Extent of pitch of Extent
6.45 6.62
7.59 7.64
7.52 7.55
7.68 7.57
6.50 7.48
6.54 7.50
7.0
6.51
Slabs
FL
6.29
6.44
7.59
7.50 6.94
6.98 6.50
7.58 7.61
BS
6.47
6.25
6.95
6.86 7.54
7.64
7.54
6.22
6.38
6.53
6.66
Telecom
6.77
6.52
FL
6.42
7.59
7.49
6.51
7.58
7.59
7.61
7.53
7.56
BS
6.48
6.40
Shelter
7.00
6.23
FL
7.54
6.91
7.64
6.22
7.56
7.48
6.43 7.56
7.0 7.51
6.20
6.54
6.64
7.52
6.76
6.85
MH
7.01 7.59
6.50
WT
WT
Brick Wall Brick
7.53
7.47
6.45
7.55
7.62
MH
7.53
7.45
FL
7.55 LP
7.0
6.39
6.25
6.43
RS Trunk 0.6m Trunk
Spread 8m Spread Goal Post
6.27
6.95
7.03
7.62
6.26
Trunk 0.6m Trunk 6.59
Spread 6m Spread
7.42
7.50
6.26
7.50
7.48
7.40
7.52
6.71
Telecom
6.55
6.63
6.98
6.83
6.52
FORTH CRESCENT FORTH
7.38 7.46
7.45
6.46
7.37
7.48
6.30
7.52
6.19
7.01
6.57
FH
6.34
6.21
7.0
Spread 12m Spread
Trunk 0.7m Trunk
Mk
7.43
7.34
7.42
7.44
7.33
7.48
6.97
6.23
6.33
6.77
6.32
6.57
7.00
6.42
7.36
6.78
6.86
7.21
6.56
7.31
7.43
7.38
7.46
7.41
7.32
6.17
6.97
6.30
6.56
6.32 6.88 7.28
7.35
6.43
6.79 7.43
7.34
7.38
7.30
6.60 6.33
7.0
6.39
6.81 6.91 7.27 7.36
7.41 6.56
Speed
Hump
Speed
Hump
6.63 6.93
7.24 7.44 7.34 7.33
7.38
7.29
LP
6.66
G
6.96
G
7.24
7.01
Spread 13m Spread
Trunk 0.9m Trunk
6.89
6.43 6.88 7.0 7.35
7.24 7.40
6.23
6.20 6.27
7.30 7.31
6.61
Tactile 6.34 7.27
7.23
7.32 7.02
7.30 7.27 7.50
7.27 7.30
6.55 7.37 7.41
6.92 7.27
6.26
Trunk 0.3m Trunk
Spread 4m Spread 6.30
7.30 7.28
7.22 7.32 7.30 6.48
LEVEN COURT LEVEN
6.56
6.94 6.63
6.15
SV 7.30
7.25 WT
7.21 7.29
7.28
7.37
SV
Trunk 0.6m Trunk Spread 9m Spread
7.27
6.41
7.24
6.83
6.89 7.36
7.23
7.27
6.86 7.26
6.59
7.27 7.23
7.19 7.22 6.94
7.28
Trunk 0.7m Trunk
6.90
Spread 7m Spread Tactile
7.26
Trunk 0.6m Trunk
Spread 7m Spread 7.39
7.21
7.26
6.51
6.95 6.15
7.0
7.32 7.21
7.25
6.26 7.27 7.17
6.54
7.37
6.46
7.00
7.22
6.60
6.28
6.46
Trunk 0.6m Trunk
Spread 6m Spread
6.66
6.37 6.43
7.27
7.16
7.29 6.31
7.23
7.14
7.24
6.88
6.58
6.51
Trunk 0.6m Trunk
Spread 7m Spread 6.90
7.21 7.26
7.11 6.95
7.21
7.12
7.21
6.56
6.88
7.19
6.57 7.00
P/W Fence
Spread 13m Spread
Trunk1.0m
6.75
6.67
G
G 6.39
7.20 7.25
7.10 LP
7.18
7.10
7.20
6.56
6.90
6.35
6.90
6.32
6.49
6.20 Mk
7.18 7.25
7.08
Trunk 0.8m Trunk Spread 8m Spread
7.14
7.09 7.18
7.0
6.54
6.56
7.26
6.92 Telecom
7.25
6.91
6.79
Trunk 0.9m Trunk
Spread 7m Spread
Spread 12m Spread Trunk 1.1m Trunk
7.18
7.08
6.34 Trunk 0.8m Trunk
7.14 Spread 7m Spread
7.07 6.75
7.17
7.25
6.92
Telecom MH
7.37
7.20
6.91
6.31
6.85
6.44 7.17 7.31
7.07 7.29 7.25
7.14 7.17 7.18
6.18 6.52 7.15
7.05 7.12
Dead 7.07 7.10
7.16 6.90
6.21 6.49
6.52 6.35 7.23
7.19 6.76
7.11 6.96 Dougall Baillie Associates Proposed Residential Development Alloa Park Phase 9 Flood Risk Assessment March 2021
Appendix C
Culvert Blockage Mitigation Principles by Fairhurst