Flood Risk Assessment On

Flood Risk Assessment on:

Residential Development Lower Street Salhouse

RLC Ref: 151540

January 2017

Prepared for Woodbastwick Estate

Woodbastwick Estate Lower Street, Salhouse

Limitations

Rossi Long Consulting Ltd has prepared this Report for the sole use of Woodbastwick Estate (“Client”) in accordance with the Agreement under which our services were performed [letter dated 26 November 2015]. No other warranty, expressed or implied, is made as to the professional advice included in this Report or any other services provided by Rossi Long Consulting Ltd. This Report is confidential and may not be disclosed by the Client nor relied upon by any other party without the prior and express written agreement of Rossi Long Consulting Ltd.

The conclusions and recommendations contained in this Report are based upon information provided by others and upon the assumption that all relevant information has been provided by those parties from whom it has been requested and that such information is accurate. Information obtained by Rossi Long Consulting Ltd has not been independently verified by Rossi Long Consulting Ltd, unless otherwise stated in the Report.

The methodology adopted and the sources of information used by Rossi Long Consulting Ltd in providing its services are outlined in this Report. The work described in this Report was undertaken during October 2016 to January 2017 and is based on the conditions encountered and the information available during the said period of time. The scope of this Report and the services are accordingly factually limited by these circumstances.

Where assessments of works or costs identified in this Report are made, such assessments are based upon the information available at the time and where appropriate are subject to further investigations or information which may become available.

Rossi Long Consulting Ltd disclaim any undertaking or obligation to advise any person of any change in any matter affecting the Report, which may come or be brought to Rossi Long Consulting Ltd’s attention after the date of the Report.

Certain statements made in the Report that are not historical facts may constitute estimates, projections or other forward-looking statements and even though they are based on reasonable assumptions as of the date of the Report, such forward-looking statements by their nature involve risks and uncertainties that could cause actual results to differ materially from the results predicted. Rossi Long Consulting Ltd specifically does not guarantee or warrant any estimate or projections contained in this Report.

Woodbastwick Estate Lower Street, Salhouse

Table of Contents

1 Introduction and Client’s Brief ...... 5 2 Site Description ...... 6 3 Planning Policy and Flood Risk ...... 7 4 Ground Conditions and Hydrology ...... 9 5 Existing Drainage ...... 11 6 Flood Risk Sources ...... 12 7 Surface Water Drainage ...... 16 8 Foul Drainage ...... 18 9 Conclusions and Recommendations ...... 19 10 Appendices ...... 20 Appendix A – Proposed Site Layout ...... 21 Appendix B – Site Survey Drawing ...... 22 Appendix C – Site Investigation ...... 23 Appendix D – Anglian Water Sewer Mapping ...... 24 Appendix E – Drainage Strategy Drawing...... 25 Appendix F – Surface Water Drainage Calculations ...... 26

Woodbastwick Estate Lower Street, Salhouse

1 Introduction and Client’s Brief

1.1 We were instructed by David Futter Associates Ltd, on behalf of Woodbastwick Estate, to undertake a Flood Risk Assessment for the proposed residential development at land off Lower Street, Salhouse.

1.2 The proposal for the site is for a new residential development of 16 dwellings with associated access roads, parking and garaging.

1.3 The proposed site layout is shown on the Architect’s drawing included in Appendix A.

1.4 The National Planning Policy Framework (NPPF) requires a Flood Risk Assessment to be undertaken for all development proposals that are situated in Flood Zones 2 & 3; or land in Flood Zone 1 greater than one hectare. This should identify and assess the risk of all forms of flooding to and from development and demonstrate how these flood risks will be managed so that the development remains safe throughout its lifetime, taking climate change into account. Further details are included in Section 3 of this report.

1.5 This report is compiled with the benefit of our findings from desk study research, topographical survey and walk-over survey, and with reference to site investigation undertaken by A F Howland Associates.

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Woodbastwick Estate Lower Street, Salhouse

2 Site Description

2.1 The proposed development is located off Lower Street, Salhouse and comprises approximately 1.5 hectares of land currently for equestrian use. The site is bounded by arable fields to the north and west, with housing and a village hall to the south and east. The Ordnance Survey grid reference for the site is TG 308 145. A location plan is shown below:

Location Plan

2.2 The site, occupied by agricultural buildings to be demolished, is falling gently from north to south towards Lower Street. Ground levels are generally in the range of 14.75 – 13.00m AOD.

2.3 A site survey drawing showing ground levels and surface features is included in Appendix B.

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3 Planning Policy and Flood Risk

3.1 The National Planning Policy Framework (NPPF) was published by the Department for Communities and Local Government in March 2012. It replaced a number of planning documents, including Planning Policy Statement 25: Development and Flood Risk. NPPF requires that flood risk is taken into account in the planning process, to avoid inappropriate development in areas at risk of flooding and to direct development away from areas at highest risk. The overall aim should be to steer new development towards Flood Zone 1.

3.2 Flood Zone 1 is a low probability zone that comprises land assessed as having a less than 1 in 1000 annual probability of river flooding in any year (< 0.1%).

Flood Zone 2 is a medium probability flood zone that comprises land assessed as having between a 1 in 100 and 1 in 1000 annual probability of river flooding in any year (1.0% - 0.1%).

Flood Zone 3a is a high probability flood zone that comprises land assessed as having a 1 in 100 or greater annual probability of river flooding in any year (> 1.0%).

Flood Zone 3b, the functional floodplain, comprises land where water has to flow or be stored in times of flood.

3.3 From Environment Agency flood zone mapping it is confirmed that the site is situated in Flood Zone 1.

3.4 There are no restrictions to the type of development permitted within Flood Zone 1.

The NPPF permits certain types of developments within the other two higher probability zones, Zone 2 (medium) and Zone 3 (high), subject to the type of development and mitigation measures being put in place.

The NPPF “Flood Risk Vulnerability Classification” sets out these development types and categorises them as follows:

 Essential Infrastructure

 High Vulnerability

 More Vulnerable

 Less Vulnerable

 Water Compatible Development

The NPPF defines ‘Buildings used for dwelling houses’ as ‘More Vulnerable’ development.

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Table 3: Flood risk vulnerability and flood zone ‘compatibility’

Flood risk Essential Water Highly More Less vulnerability infrastructure compatible vulnerable vulnerable vulnerable classification (see table 2) Zone 1 ✓ ✓ ✓ ✓ ✓ Zone 2 ✓ ✓ Exception ✓ ✓ Test required Zone 3a Exception ✓ x Exception ✓ Test required Test required Zone 3b Exception ✓ x x x functional Test required floodplain Flood zone (see table 1) table (see zone Flood

Key: ✓ Development is appropriate x Development should not be permitted

‘More Vulnerable’ development is appropriate in Flood Zone 1 and the Exception Test is not required.

Properly prepared assessments of flood risk will inform the decision-making process at all stages of development planning. A Strategic Flood Risk Assessment is a study carried out by one or more local planning authorities to assess the risk to an area from flooding from all sources, now and in the future, taking account of the impacts of climate change, and to assess the impact that changes or development in the area will have on flood risk. It may also identify, particularly at more local levels, how to manage those changes to ensure that flood risk is not increased. A site specific Flood Risk Assessment is carried out by, or on behalf of, a developer to assess the risk to a development site and demonstrate how flood risk from all sources of flooding to the development itself and flood risk to others will be managed now, and taking climate change into account.

3.5 For site specific Flood Risk Assessments the main study requirement is to identify the flood zone and vulnerability classification relevant to the proposed development, based on an assessment of current and future conditions. A site specific Flood Risk Assessment must demonstrate that the development will be safe for its lifetime, taking account of the vulnerability of its users without increasing flood risk elsewhere and, where possible, will reduce flood risk overall.

3.6 For sites in Flood Zone 1, the Flood Risk Assessment is principally required to consider the management of surface water run-off together with flood risk from sources other than rivers and the sea. Surface water arising from a developed site should, as far as practicable, be managed in a sustainable manner to mimic the surface water flows arising from the site prior to the proposed development, while reducing the flood risk to the site itself and elsewhere, taking climate change into account.

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Woodbastwick Estate Lower Street, Salhouse

4 Ground Conditions and Hydrology

4.1 British Geological Survey (BGS) mapping shows the site is situated on superficial deposits described as Happisburgh Glacigenic Formation – Sand and Gravel. The underlying bedrock geology is Crag Group – Sand and Gravel.

4.2 Historical borehole records on the BGS website for a nearby borehole confirm Crag Group – Sand and Gravel. Groundwater was struck at 16.5m below ground level (m bgl).

4.3 In terms of groundwater vulnerability, the site overlies Secondary A and a Principal Aquifer with respect to superficial and bedrock geology respectively. The site is not located within a Groundwater Source Protection Zone (SPZ):

THE SITE

GROUNDWATER SPZ

Groundwater Source Protection Map

4.4 The natural fall of the area is towards the east towards Salhouse Broad where ground levels are significantly lower than site ground level.

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4.5 Exploratory trial holes were excavated by A F Howland Associates to enable BRE Digest 365 porosity testing to be completed. Three trial holes were excavated and topsoil was encountered at depths of 0.55 – 0.60m bgl. The underlying natural soils comprise the following:

TP01 0.60 – 2.00m Slightly clayey, silty, fine to medium SAND

TP02 0.60 – 1.50m Slightly gravelly, fine to medium SAND 1.50 – 2.00m Slightly clayey, silty, fine to medium SAND

TP03 0.55 – 1.00m Slightly gravelly, fine to medium SAND 1.00 – 2.00m Slightly clayey, silty, fine to medium SAND

The results of the BRE Digest 365 porosity testing were recorded as follows:

TP01 – 9.21 x 10-6 m/sec TP02 – 3.19 x 10-5 m/sec TP03 – 1.26 x 10-5 m/sec

The results represent good soakage potential.

4.6 Soakaway test results and trial hole logs are included in Appendix C.

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Woodbastwick Estate Lower Street, Salhouse

5 Existing Drainage

5.1 We are not aware of any formal drainage currently serving the site. The site has been developed previously but no records are available.

5.2 Anglian Water mapping indicates that foul sewers serve the residential areas adjacent to the site. There are no surface water sewers shown on the mapping. An extract of the mapping is shown below with a full copy included in Appendix D:

Extract of Anglian Water Map

5.3 The site is not situated in a Critical Drainage Catchment.

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6 Flood Risk Sources

6.1 The site is situated in Flood Zone 1, as shown on the Environment Agency mapping below. Flood Zone 1 is a low probability flood zone and comprises land assessed as having a less than 1 in 1000 annual probability of river or sea flooding in any year (< 0.1%).

FLOOD ZONE 3

THE SITE

Flood Zone Map

6.2 Groundwater flooding occurs when water levels in the ground rise above surface elevations. A historic borehole record held on the BGS site shows that groundwater level was encountered at 16.5m depth below ground level at a nearby site. The risk of groundwater flooding occurring is low.

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6.3 Surface water flooding occurs when intense rainfall is unable to soak into the ground or enter drainage systems but lies on or flows over the ground instead. The Environment Agency publishes mapping showing the risk of flooding from surface water:

Extract from Surface Water Flooding Map

6.4 The mapping shows that the site is vulnerable to surface water flooding ranging from ‘very low’ to ‘high’ risk as follows:

 ‘High’ risk means that each year this area has a chance of flooding of greater than 3.3% (> 1 in 30);

 ‘Medium’ risk means that each year this area has a chance of flooding of between 1.0% and 3.3% (1 in 100 to 1 in 30);

 ‘Low’ risk means that each year this area has a chance of flooding of between 0.1% and 1.0% (1 in 1000 to 1 in 100);

 ‘Very low’ risk means that each year this area has a chance of flooding of less than 0.1% (< 1 in 1000).

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6.5 Mapping for surface water flood risk includes detailed information on the potential depth and velocity of the flooding for each level of risk. When the actual development area of the site is considered in conjunction with this mapping, the following is noted.

(i) For the high risk scenario, flooding to a depth of ‘below 300mm’ is predicted in the south-east corner of the site (see below):

(ii) For the medium risk scenario, flooding is predicted in the south-east corner of the site at ‘below 300mm’ flood depth and between 300mm to 900mm depth (see below):

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To safeguard the development from surface water flooding, the ground floor level of dwellings should be set at a level no lower than the 1 in 100 year flood level for the site (the 1 in 100 year event outline occurs at the limit of the ‘medium’ risk flood outline). No flood level data is available; however, the flood mapping has been overlaid over the site survey drawing so that ground levels at the 1 in 100 year flooded boundary can be interpolated. This shows ground levels at the limit of the 1 in 100 year flood are in the range of 12.8 – 13.2m AOD and a precautionary minimum ground floor level of 13.2m AOD Is proposed for the development.

(iii) The low risk scenario represents the limit of the extreme 1 in 1000 year flood event. Although the risk of this occurring is low, the consequences are higher as can be seen from the plan below. Generally the depth of flooding is given as either ‘below 300mm’ or in the depth range of 300mm to 900mm:

6.6 For this ‘extreme’ event, two storey dwellings provide a place of safe refuge in the first floor accommodation that will be above an extreme flood. Dwellings should incorporate flood resilient construction up to the interpolated 1 in 1000 year flood level of 13.70m AOD.

6.7 From our review of Ordnance Survey mapping of the site and the surrounding area, our assessment is that there is no significant flood risk to the site from reservoirs, canals or other artificial sources. This is confirmed by reference to Environment Agency online mapping.

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7 Surface Water Drainage

7.1 The Building Regulations 2000 Approved Document H3 requires that rainwater from buildings and paved areas shall discharge to one of the following, listed in order of priority:

 An adequate soakaway or some other adequate infiltration system; or where that is not reasonably practicable,

 A watercourse; or where that is not reasonably practicable,

 A sewer.

The Building Regulations therefore adopt a design philosophy that accords with sustainable drainage systems (SuDS).

7.2 The National Planning Policy requires that, for planning applications relating to major development (development of 10 dwellings or more) or equivalent non-residential or mixed development, sustainable drainage systems for the management of run-off are put in place, unless demonstrated to be inappropriate.

Norfolk County Council (NCC) is the Lead Local Flood Authority (LLFA) for this area and the Local Planning Authority (LPA) should consult with the LLFA on surface water drainage. NCC has published guidance on the use of Sustainable Drainage Systems (SuDS), which is an approach to managing surface water run-off which seeks to mimic natural drainage systems and retain water on or near the site, as opposed to traditional drainage approaches which involve piping water off-site as quickly as possible. SuDS involves a range of techniques including soakaways, infiltration trenches, permeable pavements, grassed swales, ponds and wetlands. SuDS offers significant advantages over conventional pipe drainage systems in reducing flood risk by attenuating the rate and quantity of surface water run-off from a site, promoting groundwater recharge and improving water quality and amenity.

Planning Practice Guidance considers what sort of sustainable drainage system should be considered. Generally, the aim should be to discharge surface run-off as high up the following hierarchy of drainage options as reasonably practicable:

1) Into the ground (infiltration);

2) To a surface water body;

3) To a surface water sewer, highway drain or another drainage system;

4) To a combined sewer.

Particular types of sustainable drainage systems may not be practicable in all locations.

This hierarchy follows the same order of priority of Approved Document H3 of the Building Regulations.

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7.3 It is a requirement of the NPPF that the development does not increase flood risk elsewhere. Regulators will normally require that, for the range of annual flow rate probabilities up to and including the 1% annual probability (1 in 100 year event), the developed rate of run-off should be no greater than the undeveloped rate of run-off for the same event. Exceptions only apply where it is not practical to achieve this due to the size of the hydraulic control unit. The purpose of this is to retain a natural flow regime in the receiving watercourse and not increase peak rates of flow for events of an annual probability greater than 1%.

7.4 Site investigation has revealed soil conditions with medium sand encountered. BRE365 porosity testing was undertaken and confirmed soil infiltration rates in the range of 9.21 x 10-6 to 3.19 x 10-5 m/sec. The results represent good soakage potential. Run-off from the development should be managed in a sustainable manner using appropriate SuDS techniques.

7.5 Accordingly, surface water run-off from the proposed site will be managed as follows:

 Surface water run-off from the dwellings will be directed to on-site soakaways designed for the 100 year event +40% allowance for climate change and include a +10% allowance for the effect of urban creep;

 Private access roads and driveways will be constructed in permeable paving designed for the 100 year event +40% allowance for climate change.

7.6 The above drainage strategy will ensure that the requirements of the NPPF will be met and provides a sustainable approach to surface water management.

7.7 A drainage strategy drawing is included in Appendix E. Typical soakaway and permeable paving calculations are included in Appendix F.

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8 Foul Drainage

8.1 Under H1 of the Building Regulations, a public sewer is the preferred option for all foul drainage. Only where a public sewer is not available should other alternatives be considered.

8.2 Anglian Water records confirm that there is an existing foul sewer at this location and the proposed development should connect to the public sewer in Lower Street.

8.3 Due to adverse falls, a pumping station will be required to discharge flows to the public sewer. Connection to the public foul sewer will be subject to the formal approval of Anglian Water under Section 106 of the Water Industry Act.

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9 Conclusions and Recommendations

9.1 From examination of site levels and by reference to Environment Agency flood zone mapping, it is demonstrated that the site is situated in Flood Zone 1. This is a low probability flood zone with a less than 1 in 1000 annual probability of flooding. The site is at low risk of flooding from rivers.

9.2 All flood risk sources have been considered in Section 6 and the risk of flooding from all sources is low, except for surface water flooding which has been identified from online mapping. To protect the dwellings from the effect of any potential flooding up to the 1 in 100 year event, a minimum ground floor level of 13.2m AOD should be adopted for the development. Flood resilient construction should be used to a level of 13.7m AOD.

9.3 Site ground conditions generally comprise medium sand with good drainage characteristics. A sustainable approach to surface water run-off is proposed using soakaways for roof run-off and permeable surfaces for the access roads and driveways.

9.4 This strategy complies with the requirements of Planning Policy and provides a sustainable approach to surface water management.

9.5 Foul drainage should connect to the public sewer.

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10 Appendices

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Appendix A – Proposed Site Layout

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Appendix B – Site Survey Drawing

Flood Risk Assessment January 2017 22 630800E 630825E 630850E 630875E 630900E 630925E 630950E 630975E 631000E 631025E

BBS

14.12

Fence P/W 14.24 Hedge Root Line 14.54 14.45 14.24 14.60 14.50 14.51 314650N 14.56 314650N 14.57 14.47 14.74

POST 14.86

14.81 14.46 13.40 14.87 Hedge 14.66 13.35 14.63 14.97 14.47 14.55

13.36 Fence P/W 14.70 14.92 14.95

13.31 Hedge 14.70 13.28 14.93 14.62 15.00

13.35 15.00 14.82 14.60 13.37 15.00 13.30

14.84

14.22 14.31 14.74

13.55 13.40 Horse Training Area 14.74 14.74

Fence P/W

14.64 14.60

14.47

14.71 14.13

13.20 14.19 13.23 14.74 13.36 13.21 13.17 14.64

14.46

14.64 14.75 14.40 14.28

14.06

13.98 14.64 TreeHt = 28.75m

Fence P/W 13.19 13.26

14.75 14.45

14.29 13.15 Grass Bund 13.14 14.25 14.20 14.63 14.60 13.93 Grass 13.87

314625N 14.03 314625N

13.16

14.76 Hedge 14.28

14.27 13.23 14.63 TreeHt = 28.72m 14.00

14.15

13.86 14.74 14.40 13.99 14.33 Horse Training Area

13.09 13.10 Hedge Root Line 13.85 13.12

13.78 Fence P/W 14.64

14.76 13.80

13.17 14.36 14.21 13.97 14.03 13.86

13.84

14.20 14.65 14.60

14.71 14.34 13.08 13.06

14.07 13.60 13.00

13.51 13.52 14.02 13.90 Grass 14.09 14.61 Grass 13.53 14.74 14.36 13.14 13.81 14.00 14.40 13.00 14.01 13.51 Hedge Fence P/W 14.20 14.61 13.07

13.87 14.83 13.61 13.94 13.00 14.38 13.34 13.41 13.40

14.04 14.00 13.62

13.60 12.96

13.86 Grass Bund 14.79 14.67 13.09

14.82 13.67 13.88 15.04 14.00 14.40 314600N 13.33 314600N 13.30 13.95 Hedge Root Line 14.13 13.77 13.04 13.78 12.97 15.07 13.29 13.89

14.71 13.80

13.75 13.22 13.79 14.50 13.09 13.36 13.70

14.60 Unmade Ground Hedge Root Line 14.20 13.46 13.82 13.93 13.01 13.21 LP TP

13.01

Ridge=17.75m Horse Training Area13.00 14.60 12.96 Grass 13.17 15.06 13.77 13.16 12.96 13.04 13.09 14.63 12.92 12.85 14.40 13.71 13.72 Grass 13.55 13.20 13.08

13.40 13.25 14.26 14.20 Eaves=15.91m 13.16 12.99 13.92 Low Timber Wall 12.85 13.07 12.80 12.72 12.91 13.81 13.29 12.98

13.52 13.60 13.07 13.15 13.46 13.26 12.74 12.74 12.86 13.70 13.03 12.79 13.00 14.41 13.08

13.20 13.08

15.00 Hedge 13.45 12.80 13.12 13.05 Grass 13.04 14.56 13.09 13.12 12.98 14.06 13.17 13.15 Building 13.09 13.10 13.29 13.20 13.01 13.08 12.93 14.47 13.87 12.87 12.89 13.13 12.85 12.90 Eaves=15.46m 13.10 13.04 13.19 13.15 Gate 13.82 13.17 13.13 13.62 13.14 Track 13.46 13.15 12.83 12.73 Unmade Ground 13.50 13.41 12.85 13.15 Eaves=15.56m 12.83 Stump 12.96 12.90 13.36 13.17 14.15 13.15 12.97 12.88 Hedge Building 12.85 14.00 12.85 12.86 13.13 13.00 12.82 14.89 14.52 13.14 13.92 13.39 Ridge=16.71m 13.17 13.16 13.03 13.25 13.15 12.80 13.69 13.09 13.06 13.59 Hedge 13.18 13.12 13.12 13.87 Track 13.19 Ridge=17.74m 13.15 13.16 Grass 13.80 13.47 Ridge=16.66m 13.35 Door Eaves=18.87m Eaves=15.70m 12.92 13.34 13.03 13.16 13.09 13.11

13.29 13.17 13.16 Door 14.29 13.20 12.68 13.36 13.18 Eaves=15.88m Grass Eaves=15.73m 13.18 14.01 13.30 12.78 Eaves=15.62m 13.33 12.81 13.81 Hedge 13.08 Ridge=16.46m 12.63 Grass 13.29 13.19 14.52 13.18 314575N 14.00 13.27 314575N 13.56 13.45 12.83 12.97 14.81 12.70 13.21 Ridge=16.54m 13.34

14.43 13.35 13.37 13.37 13.00 14.20 12.78 12.76

13.69 Ridge=16.71m 13.40 Hedge 13.15 13.60 14.06 13.89 13.39 Building 13.38 12.68

14.40 12.81 12.68 12.79 14.16 13.44 13.28 12.79 13.40 Eaves=15.69m Hedge 13.14 Hedge Unmade Ground 13.50 Hedge Root Line

14.51 13.45 13.42 Eaves=15.72m 12.80

13.31 13.28 Ridge=19.93m MH 12.69 15.00 13.48 Door 12.76 12.73 13.54 12.84 Eaves=15.65m 13.53 13.46 13.63 13.92 13.46 12.76 13.82 Ridge=16.71m 13.31 Building Hedge 14.11 Eaves=15.77m Ridge=16.53m 12.73 13.49 Track 13.48 13.53 14.37 13.50 13.53 Hedge Root Line 13.51 Eaves=15.53m 12.90 Ridge=17.27m 13.10 12.75 14.52 Eaves=18.76m 15.11 Grass 12.86

13.55 13.56 13.57 13.52 Stump 13.64 13.57 14.06 13.58 Ridge=16.54m 12.78 12.75 13.69 13.90 13.44 13.80 Ridge=17.22m 13.64 14.85 12.89 Grass 14.00 Building Hedge 13.55 12.93 13.59 13.64 13.58 Grass 12.79 14.21 13.74

13.20 12.82 13.67 Eaves=15.94m

14.58 13.60 13.73 13.62 13.63 Eaves=18.74m 13.69 14.33 13.78 12.89 13.61 13.04 13.01 13.60 12.80 STNBBS3 13.95 12.91

Hedge 14.20 13.77 Hedge 12.98 Hedge Ridge=17.27m 13.77 13.62 13.67 Ridge=19.89m 13.53

14.47 13.79 12.87 Concrete ( Possible Cover ) 13.58 12.80 12.80 14.75 12.99 13.14 13.68 13.61

13.85 13.82 13.60 13.56 14.31 13.70 14.40 13.88 EP 13.60 13.58 13.81 13.79 13.65 Door Building 14.51 Grass

13.86 13.84 13.56 13.57 14.01 12.84 13.58 13.86 13.02

Grass 13.72 13.56 12.93 13.63 12.96 13.72 12.95 13.40 Hedge Hedge Eaves=18.76m 13.46 12.83 12.97 13.55 13.53 13.77 Asphalt Patch 13.53 Hedge 13.60 13.00 13.33 13.73 13.72 Temporary Building 13.11 13.07 13.13 Grass Door 12.98 13.66 13.54 12.89 Gate 13.46 13.76 13.51 13.68 13.66 13.37 13.04 Hedge 12.85 13.22 13.15 13.97 13.03 Hedge 14.07 13.89 13.01 13.32 13.71 Hedge 13.69 13.48 13.41 13.07 13.16

13.75 13.52 13.70 13.14 14.31 14.00 13.09 14.44 13.71 314550N Track 13.02 314550N 13.01 Cabinet 12.28 13.58 13.62 13.79 Eaves=17.81m 12.88 13.60 13.16 13.15 Grass 12.22 13.50 13.13 12.13 14.69 13.67 13.42 13.38 13.19 13.54 13.12 13.12 12.31 13.71 13.40 DUCT 13.13 12.81 13.18 13.12 13.14 13.67 Ridge=19.48m

13.40 13.20

Grass 13.62 13.65 13.87 Asphalt 12.20

13.80 13.60 Fence C/B 13.54 12.20

13.00 13.10 14.20 13.80 13.73 Grass 13.01

13.35 12.18 13.68 13.61 12.87 13.40 Muck 13.56 13.10 13.31 14.36 13.30 12.41 14.16 Ridge=19.87m 13.00

13.12 14.06 Grass 13.13 13.79 13.63

Eaves=18.81m 13.10 Building 12.34 12.82 13.60 12.23 14.46 13.60 13.80 13.11

13.54

13.01 Hedge / Small Trees 14.20 13.53 13.37 13.07 13.90 Eaves=17.81m Lower Street Eaves=15.05m 13.80 13.83 TreeHt = 23.95m 12.91 13.13 13.35 13.44 Track Building 12.49 14.05 13.54 Ridge=19.50m 13.30 12.28 13.19 12.82 13.13 13.65 13.12 13.17 12.86 13.38 13.13 13.15 12.53 13.03 13.75 12.23 13.58 Fence C/B 13.44 13.31 Hedge 13.87 Unmade Ground 13.17 13.65 13.15 Concrete

14.31 12.50 14.06 13.29 13.14 13.12

14.53 14.00 12.45 14.30 Grass Eaves=15.07m 13.18 14.21 12.34 13.29 Door 13.11 14.44 13.17 14.43 13.70 12.37 13.63 12.84 13.30 12.34 14.00 13.81 13.06 12.94 14.35 13.24 13.10 13.53 13.37 13.83 12.54 14.32 13.60 13.32 12.28 14.21 Track 13.44 Hedge Root Line 14.38 13.81 13.72 13.16 14.37 13.78 Fence C/B 12.36

Grass

13.60 Footpath Edging 14.20 13.56 14.48 13.30 13.20 13.01 14.14 13.82 12.90

14.30 14.25 Grass 14.38 Grass Village Hall Car Park 12.57 13.22 13.87 14.36 13.43 13.43 Building 13.20 13.30 Eaves=18.87m 13.23 14.48 13.97 12.61 12.48 14.30 13.54 Fence C/B TP 13.63 13.21 12.45 12.34 14.14 13.20 13.43

13.24 13.03 13.00 14.67 13.72 FH 12.60 13.22 12.47 13.84 Water 13.20 14.29 13.88

13.69 13.22 14.45 13.95 Tank 12.97 13.43 14.26 Gate 12.49 12.40

Eaves=17.80m 13.80 12.67

14.35 13.96 13.51 13.21 13.20 13.48 14.22 13.20 14.40 13.22 13.21 Hedge 14.27 Unmade Ground Fence C/B 12.39 14.27 13.22 13.21 13.24 Hedge 13.54 12.73 14.39 13.01 14.15 13.04 12.69 14.27 13.23 14.26 13.78 13.09 12.73 12.58 13.20 14.36 Ridge=15.60m Hedge / Small Trees 12.59 14.63 13.28 12.62 12.61 13.64 Ridge=19.52m 13.24 14.27 14.18 13.44 Grass / Muck Footpath Edging 12.50 13.06 12.80 13.44 13.05 14.27 13.86 Fence C/B 12.81 12.68 12.60 14.38 13.28 Eaves=15.24m 14.26 14.07 14.00 13.45 12.66 13.60 Grass 13.80 13.68 13.21 MP Building12.86 12.80 12.67

14.20 13.28 13.06 Building 12.56

14.32 13.17 12.88 Fence C/B 12.72 12.97 W 13.56 Throughway To Church Ridge=19.46m 13.19 Gate 12.88 314525N 13.40 12.64 12.63 314525N 13.40 Eaves=17.88m 13.12 12.86 12.73 13.47 14.29 12.95 12.91 12.77 12.75 13.39 13.21 Hedge 14.62 14.20 Asphalt 14.02 Overgrown Bushes / Small Trees 13.35 13.17 12.69

13.78 12.93 12.81 12.80 13.62 13.24 12.98 Concrete 13.10 12.79 14.24 W 12.80 13.15 12.75 14.20 13.49 13.35 13.31 13.36 MH 12.78 13.32 12.79 Track 14.18 13.00 Eaves=17.78m Muck / Grass 13.03 13.35 BT 13.33 13.18 MH 14.08 12.86 Unmade Ground 12.85 Grass 13.27 13.26 13.06 12.84 13.20 12.88 13.40 13.12 12.86 13.23 12.88 13.28 14.00 13.85 12.90 13.54 13.39 12.99 12.88 12.86 13.69 13.60 12.93 13.80 12.90 13.15 13.11 Fence C/B 12.91 12.95 14.09 12.89 Thieves Lane 14.49 13.31 12.93 14.05 13.20 12.92 13.04 12.96 Fence13.15 C/B 12.94 12.95 14.00 Gate 13.91 13.16 12.95 12.96 12.99 13.32 12.99 12.96 MH 12.90 13.53 13.30 13.18 13.68 13.13 12.90 Hedge G 12.99 13.21 Muck / Grass 13.23 12.94 13.57 G 13.10 13.85 Grass Unmade Ground 12.98 12.91 13.90 Fence C/B 13.16 13.50 13.21 Grass 13.38 13.28 13.20 12.93 12.98 13.79 13.17 13.50 12.97 SP SP SP 13.22 13.38 13.28 13.43 13.21 13.37 13.40 13.60 13.44 13.80 Hedge Root Line 13.50 13.17 13.15 13.20 F/Path13.41 Edging 13.28 13.35 13.03 14.09 13.29 13.25 13.04 13.73 13.53 13.05 13.01 13.47 13.00 13.32 13.20 Asphalt 13.04 13.09 13.50 13.09 13.29 13.05 12.99

13.26 13.69 13.34 13.30 13.43

13.25 Lay By 13.72 13.43 13.31 13.25 13.27 13.66 13.32 13.15 13.29 13.12 13.36 Track 13.39 13.16 13.25 13.13 13.63 Brick Wall 13.84 13.32 13.11 13.49 13.38 13.41 314500N 13.56 Fence C/B 13.29 13.10 314500N Gate 13.16 13.43 13.46

13.43 13.60 13.44 13.29 13.49 13.55 13.62 Muck / Grass 13.35 13.40 Hedge 13.23 13.47 13.43

13.40 13.44 13.66

13.37 13.23 13.20 13.23 13.18 13.41 13.47

13.90 13.52 13.52 Brick Wall 13.36 13.29 13.47 13.50 13.43 13.30 13.47

13.50

13.50 Asphalt Fence P/R13.72 Fence P/R 13.54 13.28 Grass 13.31 Fence C/B 13.51 13.48 G 13.31 13.56 13.60

Gate 13.50 13.34 13.38 Muck 13.42 13.55 13.31 13.43 13.50 13.59 Hedge 13.52 13.62 Fence P/R13.48 13.46

13.58 13.40 13.40 13.58 13.46 Track 13.44 13.42 13.59

13.60 13.63 13.46 13.40 POST 13.66 13.62 13.44 13.37 13.67 13.42 13.50 13.44 13.51 13.53 13.51 13.37 BT 13.61 13.46 Lay By G 13.39 13.72 Hedge 13.50 13.59 13.67 MH 13.56 13.46

13.56 13.56 13.45

13.75 13.32 13.60 13.57 G 13.51 13.53 MH Fence C/B 13.72 13.54 13.56 13.86 13.81 13.50 13.62 13.64 13.77 13.61 13.45 13.77 13.65 13.65 13.83

13.66 13.64 13.83 13.66 13.36 314475N Fence P/R 13.64 314475N Grass 13.72

13.66 13.56 13.86 Asphalt 13.51 13.93 13.93 Footpath Edging 13.68

13.70 Muck 13.74 13.91 13.71 13.42 13.49 Fence C/B 13.71

13.60 W MH 13.79 13.42 13.76 13.75 13.51 Low BrickW Wall 13.95 13.79

13.97 13.76 13.84 13.80 13.57 14.02 MH 13.67 13.78 14.00 13.54 13.99 13.82

13.81 13.82 13.60 14.05 13.83 STNBBS2 13.82 13.81 13.83 Hedge G 13.75 13.65 13.79 13.76 14.15 13.81

13.71

13.65 13.89

14.08 13.95 13.80 13.98 14.20

13.80 13.87

13.80 13.74 14.00 13.91

Track

13.97 14.25 13.83 Hedge 14.28 Brick Wall Pier

14.15 14.29 14.19 13.99 14.20 14.05

14.00 14.30 Lay By 14.05 14.31 13.93

13.99 14.28 14.28 14.00 Bricks 14.25 14.29 14.08 14.33 14.10 14.20 14.03 Brick Wall Pier 14.29 14.09

14.45

14.26 14.29

14.28 Asphalt 14.07 14.41 14.40 14.01 Fence C/B 14.36 14.04 14.53 14.53 14.21 14.23 14.18 14.53 14.34 14.48 G Fence C/B 14.20

14.42 14.01 14.04 14.03 14.60 14.43 14.09

14.62 14.05 14.61 14.40 14.06

14.36 14.67

14.70 Grass 14.20 14.80 14.47 14.41 14.27 14.82 Hedge 14.12 14.71 14.73 Grass 14.51 14.50

14.48 W 14.97 POST 14.20 14.86 14.78 14.86 14.99 14.75 15.00 14.46 Track 14.30 14.65 14.64 14.29 14.25 14.50 14.87 Hedge Root Line 14.52 14.50 314450N 14.96 14.48 14.34 314450N 14.59 14.46 Bushes 14.38

14.35 Overgrown 14.37 14.52 14.47 14.59 14.60 14.35 14.33 14.39 15.06 Sub Station 14.36 Asphalt BT 14.34

14.89 14.49 14.40 14.48

14.37 14.58 14.54 14.37

14.78 14.37 14.35

14.62 14.40 14.69

14.66 14.43 14.42 14.60 14.43

14.60 14.61 14.67 Fence P/R 14.68 G 14.62 14.43 14.48 14.46 Gate 14.50 G 14.47 Asphalt 14.45 W 14.58 Bricks 14.49 14.59 Brick Wall 14.52 14.49 14.50 14.58 14.52 14.91 14.53 14.70 SV 14.53 14.70 14.51

14.66 14.50 14.54 14.73 14.61

14.75 14.56

14.71 14.73 14.75 14.57 14.58 MH 14.61

14.60 14.60 14.55 14.78 14.58

14.61 14.58 14.80 14.78 14.62 STNBBS1 14.92 14.75 14.59

14.69 14.86 14.80 14.82 314425N 14.74 314425N

14.70 14.97 15.00

15.04 MH 14.73 Fence P/R 14.90 14.80 14.90 14.63 14.67 15.11 15.12 14.83 14.88 14.86 14.74

14.76 14.78 14.93 15.20 15.18 Asphalt 15.04 15.27 Cheyney Avenue 14.71 15.17 14.68

14.92 14.85 14.71

14.70 15.25

14.94 14.67 14.89 14.75

Lower Street

14.78

14.72 630800E 630825E 630850E 630875E 630900E 630925E 630950E 630975E 631000E 631025E Lower St, Salhouse - Area A - Existing OGL Survey 2D All survey data to Ordnance Survey National Grid (OSTN02)

(Surveyed by BB Surveys 16th February 2016 using Trimble S8 & Trimble R10 GPS with VRS)

STATION TABLE Code Easting Northing Height STNBBS1 630868.555 314426.523 14.694 STNBBS2 630931.298 314469.403 13.791 STNBBS3 631022.106 314559.715 12.081

Woodbastwick Estate Lower Street, Salhouse

Appendix C – Site Investigation

Flood Risk Assessment January 2017 23

A REPORT ON A SITE INVESTIGATION AT LOWER STREET, SALHOUSE (FACTUAL)

CLIENT: Woodbastwick Estate

ENGINEER: Rossi Long Consulting Limited

Date: 5 December 2016

Reference: JDR/16.375

A F Howland Associates The Old Exchange Newmarket Road Cringleford Norwich NR4 6UF

Tel: 01603 250754

Fax: 01603 250749

CONTENTS

1. INTRODUCTION 1

2. FIELDWORK 2

APPENDICES

APPENDIX A: REFERENCES

APPENDIX B: TRIAL PIT AND SOAKAGE TEST RECORDS APPENDIX C: DRAWINGS

CLIENT: Woodbastwick Estate

ENGINEER: Rossi Long Consulting Limited

A REPORT ON A SITE INVESTIGATION AT LOWER STREET, SALHOUSE (FACTUAL)

Reference: JDR/16.375

Date: 5 December 2016

1. INTRODUCTION

It is proposed to develop a site at Lower Street, Salhouse, Norwich, NR13 6RW (Drawing 16.375/1).

At the instruction of the Client, a site investigation has been undertaken to provide an assessment of the infiltration characteristics of the shallow sub-surface soil to aid the drainage design for the proposed development.

This report provides the factual details of the fieldwork undertaken during the investigation.

JDR/16.375 Page 2 5 December 2016

2. FIELDWORK

The fieldwork was carried out between 14 and 15 November 2016 and comprised three machine excavated trial pits with subsequent soakage testing.

The trial pit locations were set out in general accordance with the requirements of the engineer, Rossi Long Consulting Limited. The positions are shown approximately on drawing 16.375/2.

A cable avoidance tool (CAT) was used to sweep the location of each pit and the immediate surrounding area to locate any potential services, and the position adjusted as necessary.

Soils were described in general accordance with BS EN 1997-2:2007 Eurocode 7 and its UK National Annex supported by BS 5930:2015. Details of the strata encountered are shown on records appended to this report.

The trial pits, which are referenced TP01 to TP03, were excavated by a wheeled back- acting excavator equipped with a 0.45 m wide bucket and taken to a depth of 2.0 m. To facilitate soakage testing the pits were filled with 20 mm diameter gravel from 1.0 m to 2.0 m, then backfilled with arisings. The tests were carried out in accordance with Building Research Establishment report 365 (BRE, 2016) by filling the test section with water and recording the time taken for it to drain away. In addition to manual dipping, data loggers were installed to record the level of the water. Groundwater was not encountered in any of the trial pits.

The trial pit records and infiltration test results are appended to this report.

Mr J D Ryan Dr A F Howland BSc (Hons) FGS MSc PhD DIC CEng FIMMM CGeol FGS

A F HOWLAND ASSOCIATES 5 December 2016

APPENDIX A: REFERENCES

BUILDING RESEARCH ESTABLISHMENT. 2016. BRE Digest 365: Soakaway design. Building Research Establishment, London.

BRITISH STANDARDS INSTITUTION. 2015. BS 5930:2015 Code of practice for ground investigations. British Standards Institution. London.

BRITISH STANDARDS INSTITUTION. 2007. Eurocode 7 – Geotechnical Design. Part 2: Ground investigation and testing. British Standards Institution. London.

APPENDIX B: TRIAL PIT AND SOAKAGE TEST RECORDS

D Disturbed Sample

All depths and measurements are given in metres, except as noted

Strata descriptions compiled by visual examination of samples obtained after BS EN 1997-2:2007 Eurocode 7 and its UK National Annex supported by BS 5930:2015 and modified in accordance with laboratory test results where applicable

Site Trial Pit Number Lower Street, Salhouse, NR13 6RW TP01

Excavation Method Dimensions Ground Level (mOD) Client Job W 0.45 m x D 2.0 m x L 1.5 m Number Mini Digger Woodbastwick Estate 16.375

Location Dates Engineer Sheet 14/11/2016 Rossi Long Consulting Limited 1/1

Depth Water Level Depth (m) Sample / Tests Depth Field Records (mOD) (m) Description Legend

(m) (Thickness) Water

0.00-0.60 D1 TOPSOIL (grass over light brown slightly clayey silty slightly gravelly fine to medium SAND. Gravel is subangular to subrounded fine to medium flint)

(0.60)

0.60 0.60-0.70 D2 (0.10) Brown silty gravelly fine to medium SAND. Gravel is 0.70 subangular to subrounded fine to coarse flint 0.70-2.00 D3 Yellow brown slightly clayey silty fine to medium SAND

(1.30)

2.00 Complete at 2.00m

Remarks

1. Location CAT scanned prior to excavation. 2. No groundwater encountered 3. Sidewalls stable during excavation 4. Backfilled with gravel to 1 m then arisings to surface 5. Soakage test performed between 1.0 m and 2.0 m

No image available

Scale (approx) Logged By Figure No.

1:20 JDR 16.375.TP01

Job Number Site : Lower Street, Salhouse, NR13 6RW 16.375

Client : Woodbastwick Estate Sheet

Engineer : Rossi Long Consulting Limited 1 / 1

Location Date Level Location Pit Width (m) 0.45

TP01 14/11/2016 Pit Depth (m) 2.00

Pit Length (m) 1.50

Soil type at test level Slightly clayey silty fine to medium SAND

Groundwater Not encountered

Drain discharge depth Not known

Sidewall stability Stable

Stone filled or open pit Stone Filled

123 Remarks

Effective depth (m) 1.04 1.01 1.04 1. Soakage test performed between 1.0 m and 2.0 m 2. No groundwater encountered Volume outflowing between 75% & 25% (m3)* 0.11 0.10 0.11 3. Datalogger serial no. 12575011

Mean surface area through which outflow occurs (m2) 2.70 2.64 2.70

Time for outflow between 75% & 25% (min) 45.82 65.04 70.54

SOIL INFILTRATION RATE (ms-1), f 1.42E-5 9.93E-6 9.21E-6 * Volume outflowing reduced to account for granular backfill used during testing (30 % of free volume assumed). Elapsed time Depth to Water Depth to Water Depth to Water (mins) Test 1 Test 2 Test 3 0 0 0.956 0.992 0.96 0.2 1 1.034 1.017 1.002 0.4 2 1.087 1.037 1.03 0.6 3 1.128 1.058 1.054 0.8 1 4 1.163 1.078 1.074

Test 1 1.2 5 1.194 1.098 1.092 1.4 6 1.223 1.115 1.108 1.6 7 1.248 1.13 1.122

Depth to Water (m) 1.8 8 1.272 1.145 1.136 9 1.296 1.16 1.15 0 15 30 45 60 75 90 105 120 10 1.316 1.175 1.164 Time (mins) 15 1.398 1.241 1.222 0 20 1.465 1.297 1.273 0.2 0.4 25 1.521 1.35 1.32 0.6 30 1.57 1.40 1.364 0.8 35 1.614 1.444 1.403 1 40 1.656 1.485 1.442

Test 2 1.2 45 1.694 1.524 1.478 1.4 50 1.729 1.561 1.511 1.6

55 1.76 1.595 1.545 Depth to Water (m) 1.8 60 1.784 1.628 1.578 65 1.807 1.66 1.607 0 15 30 45 60 75 90 105 120 70 1.828 1.69 1.637 Time (mins) 0 75 1.847 1.718 1.668 0.2 80 1.863 1.746 1.70 0.4 85 1.878 1.778 1.737 0.6 85.333 1.879 0.8 90 1.806 1.778 1

95 1.834 1.825 Test 3 1.2 99.333 1.863 1.4 100 1.86 1.6

105 1.872 Depth to Water (m) 1.8 110 1.877 0 15 30 45 60 75 90 105 120 118.333 1.885 Time (mins)

Excavation Method Dimensions Ground Level (mOD) Client Job W 0.45 m x D 2.0 m x L 1.5 m Number Mini Digger Woodbastwick Estate 16.375

Location Dates Engineer Sheet 14/11/2016 Rossi Long Consulting Limited 1/1

Depth Water Level Depth (m) Sample / Tests Depth Field Records (mOD) (m) Description Legend

(m) (Thickness) Water

0.00-0.60 D1 TOPSOIL (grass over slightly silty slightly gravelly fine to medium SAND. Gravel is subangular to subrounded fine to medium flint)

(0.60)

0.60 0.60-1.50 D2 Light brown silty slightly gravelly fine to medium SAND. Gravel is subangular to subrounded fine to medium flint

(0.90)

1.50 1.50-2.00 D3 Yellow brown slightly clayey silty fine to medium SAND

(0.50)

2.00 Complete at 2.00m

Remarks

No image available

Scale (approx) Logged By Figure No.

1:20 JDR 16.375.TP02

Job Number Site : Lower Street, Salhouse, NR13 6RW 16.375

Client : Woodbastwick Estate Sheet

Engineer : Rossi Long Consulting Limited 1 / 1

Location Date Level Location Pit Width (m) 0.45

TP02 14/11/2016 Pit Depth (m) 2.00

Pit Length (m) 1.50

Soil type at test level Slightly clayey silty fine to medium SAND

Groundwater Not encountered

Drain discharge depth Not known

Sidewall stability Stable

Stone filled or open pit Stone Filled

123 Remarks

Effective depth (m) 1.00 1.00 1.03 1. Soakage test performed between 1.0 m and 2.0 m 2. No groundwater encountered Volume outflowing between 75% & 25% (m3)* 0.10 0.10 0.10 3. Datalogger serial no. 13114011

Mean surface area through which outflow occurs (m2) 2.63 2.63 2.68

Time for outflow between 75% & 25% (min) 16.71 18.91 20.36

SOIL INFILTRATION RATE (ms-1), f 3.84E-5 3.42E-5 3.19E-5 * Volume outflowing reduced to account for granular backfill used during testing (30 % of free volume assumed). Elapsed time Depth to Water Depth to Water Depth to Water (mins) Test 1 Test 2 Test 3 0 0 0.999 0.98 0.973 0.2 1 1.112 1.072 1.07 0.4 2 1.19 1.135 1.134 0.6 3 1.255 1.187 1.192 0.8 1 4 1.31 1.233 1.241

Test 1 1.2 5 1.36 1.275 1.283 1.4 6 1.401 1.313 1.321 1.6 7 1.44 1.348 1.356

Depth to Water (m) 1.8 8 1.474 1.382 1.392 9 1.506 1.412 1.423 0 5 10 15 20 25 30 35 10 1.535 1.441 1.452 Time (mins) 11 1.561 1.467 1.48 0 12 1.587 1.491 1.506 0.2 0.4 13 1.61 1.514 1.532 0.6 14 1.632 1.536 1.556 0.8 15 1.654 1.557 1.578 1 16 1.677 1.578 1.598

Test 2 1.2 17 1.697 1.598 1.616 1.4 18 1.717 1.618 1.635 1.6

19 1.738 1.639 1.652 Depth to Water (m) 1.8 20 1.757 1.661 1.669 21 1.777 1.691 1.686 0 5 10 15 20 25 30 35 22 1.797 1.722 1.704 Time (mins) 0 23 1.816 1.746 1.723 0.2 24 1.834 1.767 1.741 0.4 26 1.856 1.807 1.775 0.6 28 1.871 1.842 1.809 0.8 30 1.885 1.863 1.839 1

31 1.892 Test 3 1.2 32 1.876 1.862 1.4 33.5 1.877 1.6

34 1.884 Depth to Water (m) 1.8 36 1.892 0 5 10 15 20 25 30 35 Time (mins)

Excavation Method Dimensions Ground Level (mOD) Client Job W 0.45 m x D 2.0 m x L 1.5 m Number Mini Digger Woodbastwick Estate 16.375

Location Dates Engineer Sheet 14/11/2016 Rossi Long Consulting Limited 1/1

Depth Water Level Depth (m) Sample / Tests Depth Field Records (mOD) (m) Description Legend

(m) (Thickness) Water

0.00-0.55 D1 TOPSOIL (grass over light brown slightly clayey silty gravelly fine to medium SAND. Gravel is subangular to subrounded fine to medium flint)

(0.55)

0.55 0.55-1.00 D2 Light brown silty gravelly fine to medium SAND. Gravel is subangular to subrounded fine to coarse flint

(0.45)

1.00 1.00-2.00 D3 Yellow brown slightly clayey silty fine to medium SAND

(1.00)

2.00 Complete at 2.00m

Remarks

No image available

Scale (approx) Logged By Figure No.

1:20 JDR 16.375.TP03

Job Number Site : Lower Street, Salhouse, NR13 6RW 16.375

Client : Woodbastwick Estate Sheet

Engineer : Rossi Long Consulting Limited 1 / 1

Location Date Level Location Pit Width (m) 0.45

TP03 14/11/2016 Pit Depth (m) 2.00

Pit Length (m) 1.50

Soil type at test level Slightly clayey silty fine to medium SAND

Groundwater Not encountered

Drain discharge depth Not known

Sidewall stability Stable

Stone filled or open pit Stone Filled

123 Remarks

Effective depth (m) 0.99 0.98 0.98 1. Soakage test performed between 1.0 m and 2.0 m 2. No groundwater encountered Volume outflowing between 75% & 25% (m3)* 0.10 0.10 0.10 3. Datalogger serial no. 10226010

Mean surface area through which outflow occurs (m2) 2.61 2.59 2.59

Time for outflow between 75% & 25% (min) 32.93 48.83 50.66

SOIL INFILTRATION RATE (ms-1), f 1.94E-5 1.31E-5 1.26E-5 * Volume outflowing reduced to account for granular backfill used during testing (30 % of free volume assumed). Elapsed time Depth to Water Depth to Water Depth to Water (mins) Test 1 Test 2 Test 3 0 0 1.012 1.016 1.021 0.2 1 1.164 1.092 1.149 0.4 2 1.246 1.162 1.22 0.6 3 1.303 1.211 1.267 0.8 1 4 1.347 1.252 1.307

Test 1 1.2 5 1.383 1.285 1.339 1.4 6 1.412 1.318 1.366 1.6 7 1.44 1.343 1.39

Depth to Water (m) 1.8 8 1.464 1.367 1.411 9 1.485 1.386 1.43 0 15 30 45 60 75 90 105 10 1.504 1.405 1.447 Time (mins) 12 1.538 1.439 1.477 0 14 1.566 1.467 1.502 0.2 0.4 16 1.591 1.493 1.525 0.6 18 1.614 1.516 1.545 0.8 20 1.634 1.536 1.563 1 25 1.68 1.582 1.602

Test 2 1.2 30 1.719 1.62 1.634 1.4 35 1.752 1.654 1.666 1.6

40 1.783 1.686 1.693 Depth to Water (m) 1.8 45 1.81 1.713 1.716 50 1.834 1.739 1.74 0 15 30 45 60 75 90 105 55 1.856 1.763 1.761 Time (mins) 0 60 1.879 1.785 1.782 0.2 62.333 1.89 0.4 65 1.806 1.799 0.6 70 1.825 1.816 0.8 75 1.843 1.83 1

80 1.859 1.843 Test 3 1.2 83.667 1.871 1.4 85 1.857 1.6

90 1.869 Depth to Water (m) 1.8 95 1.882 0 15 30 45 60 75 90 105 98.167 1.892 Time (mins)

APPENDIX C: DRAWINGS

Drawing 16.375/1 Site Location Plan

Drawing 16.375/2 Exploratory Hole Location Plan

SITE LOCATION

North Box indicates approximate position of drawing 16.375/2

Site: Lower Street, Salhouse, NR13 6RW

SITE LOCATION PLAN

Scale 1: 50,000 @ A4 Client : Woodbastwick Estate

Reproduced by permission of Ordnance Survey on behalf of the Controller of Her Majesty's Date : December 2016 Dwg : 16.375/1 6WDWLRQHU\2IILFH&URZQ&RS\ULJKW/LFHQFH1R$/ North Key:

Approximate trial pit location and reference

Reproduced by permission of Ordnance Survey on behalf of the TP02 &RQWUROOHURI+HU0DMHVW\ V6WDWLRQHU\2IILFH&URZQ Copyright Licence No. AL 100002157

TP01

TP03 Rev Date Revision Description Drwn Chkd

A F Howland Associates Ltd The Old Exchange Newmarket Road Cringleford Norwich NR4 6UF Tel: 01603 250754 Fax: 01603 250749 web: www.howland.co.uk mail: [email protected]

Client: Woodbastwick Estate Site: Lower Street, Salhouse, NR13 6RW

Job No.: 16.375 Drawing Title: EXPLORATORY HOLE LOCATION PLAN

Date: December 2016 Drawing No: 16.375/2 Scale: 1:1000 @ A4

The Old Exchange Newmarket Road Cringleford Norwich NR4 6UF

Tel: 01603 250754 Fax: 01603 250749 Email: [email protected] www: http://www.howland.co.uk

Woodbastwick Estate Lower Street, Salhouse

Appendix D – Anglian Water Sewer Mapping

Flood Risk Assessment January 2017 24 (c) Crown copyright and database rights 2017 Ordnance Survey 100022432 Date: 06/01/17 Scale: 1:1250 Map Centre: 630878,314502 Data updated: 24/10/16 Our Ref: 209224 - 1 Wastewater Plan A3

This plan is provided by Anglian Water pursuant its obligations under the Water Industry Act 1991 sections 198 or 199. It must be used in conjunction with Foul Sewer [email protected] any search results attached. The information on this plan is based on data currently recorded but position must be regarded as approximate. Service pipes, Outfall private sewers and drains are generally not shown. Users of this map are strongly advised to commission their own survey of the area shown on the plan Surface Sewer (Colour denotes effluent type) 151540 before carrying out any works. The actual position of all apparatus MUST be established by trial holes. No liability whatsoever, including liability for Combined Sewer negligence, is accepted by Anglian Water for any error or inaccuracy or omission, including the failure to accurately record, or record at all, the location of Inlet any water main, discharge pipe, sewer or disposal main or any item of apparatus. This information is valid for the date printed. This plan is produced by Final Effluent (Colour denotes effluent type) Anglian Water Services Limited (c) Crown copyright and database rights 2016 Ordnance Survey 100022432.This map is to be used for the purposes of Rising Main viewing the location of Anglian Water plant only. Any other uses of the map data or further copies is not permitted. This notice is not intended to exclude or Manhole (Colour denotes effluent type) (Colour denotes effluent type) restrict liability for death or personal injury resulting from negligence. Private Sewer (Colour denotes effluent type) Sewage Treatment Works Decommissioned Sewer Pumping Station (Colour denotes effluent type)

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Woodbastwick Estate Lower Street, Salhouse

Appendix E – Drainage Strategy Drawing

Flood Risk Assessment January 2017 25 SAFETY, HEALTH AND ENVIRONMENTAL INFORMATION BOX NOTES: THIS DRAWING IS TO BE READ IN CONJUNCTION WITH THE RISK ! REGISTER PRODUCED FOR INCLUSION IN THE HEALTH AND SAFETY PLAN. THE HAZARDS NOTED ARE IN ADDITION TO THE NORMAL HAZARDS AND RISKS FACED BY A COMPETENT CONTRACTOR WHEN DEALING WITH THE TYPE OF WORKS DETAILED ON THIS DRAWING.

CONSTRUCTION RISKS: · NO SIGNIFICANT RISKS. 630800E 630825E 630850E 630875E 630900E 630925E 630950E 630975E 631000E 631025E MAINTENANCE/CLEANING RISKS: N · NO SIGNIFICANT RISKS. BBS

DEMOLITION RISKS: 14.12

14.12

Fence P/W 14.24 · NO SIGNIFICANT RISKS. Hedge Root Line 14.54 14.45 14.24 14.60 14.50 14.51 314650N 14.56 314650N 14.57 14.47 14.74

POST 14.86

14.81 14.46 13.40 14.87 Hedge 14.66 NOTE: TP0213.35 14.63 14.97 -5 14.47 14.55 13.36 Fence P/W 14.70 3.19x10 m/s 14.92 14.95

13.31 Hedge 14.70 13.28 1. DO NOT SCALE, IF IN DOUBT ASK. 14.93 14.62 15.00

13.35 15.00 14.82 14.60 13.37 15.00 13.30

14.84 14.22 14.31 2. THIS DRAWING IS TO BE READ IN CONJUNCTION WITH ALL RELEVANT 14.74

13.55 13.40 Horse Training Area 14.74 STRUCTURAL ENGINEER'S DRAWINGS AND DETAILS, THE SPECIFICATION 14.74

Fence P/W FOR THE WORKS, THE RELEVANT ARCHITECT'S DRAWINGS AND ANY OTHER

14.64 14.60

14.47

14.71 14.13 SPECIALIST'S DRAWINGS. 13.20 14.19

14.74 13.36 13.23 13.21 13.17 14.64

14.46 3. ANY DISCREPANCIES FOUND ON THIS OR ANY OTHER DRAWINGS ARE TO BE

14.64 14.75 14.40 14.28 REPORTED TO AND RESOLVED BY ROSSI LONG CONSULTING BEFORE THE 14.06

13.98 14.64 TreeHt = 28.75m COMMENCEMENT OF ANY WORK RELEVANT TO THE DISCREPANCY. Fence P/W 13.19 13.26

14.75 14.45

14.29 13.15 Grass Bund 13.14 14.25 14.20 13.93 4. THE PRINCIPAL CONTRACTOR IS TO PROVIDE FULLY DESIGNED 14.63 14.60 Grass 13.87 314625N 14.03 314625N PROPPING/SHORING TO FACILITATE THE WORKS. ALL PROPPING & BRACING 13.16

14.76 Hedge 14.28 IS TO BE ADEQUATELY FOUNDED TO ENSURE THE STABILITY/INTEGRITY OF

14.27 13.23 14.63 TreeHt = 28.72m 14.00

14.15 THE EXISTING/PROPOSED STRUCTURES &/OR EARTHWORKS IS

13.86 14.74 14.40 13.99 14.33 Horse Training Area MAINTAINED. UNLESS INDICATED ON THE DRAWINGS, THE TEMPORARY

13.09 13.10 Hedge Root Line 13.85 13.12

13.78 Fence P/W WORKS ARE NOT TO IMPOSE REACTIONS ON THE PERMANENT STRUCTURE 14.64

14.76 13.80 WITHOUT PRIOR WRITTEN CONSENT FROM ROSSI LONG CONSULTING.

13.17 14.36 14.21 13.97 14.03 13.86

13.84

14.20 14.65 14.60 5. THIS DOCUMENT HAS BEEN PREPARED IN ACCORDANCE WITH THE SCOPE 14.71 14.34 13.08 13.06 OF ROSSI LONG CONSULTING'S APPOINTMENT WITH ITS CLIENT AND IS 14.07 13.60 13.00

13.51 13.52 14.02 13.90 SUBJECT TO THE TERMS OF THAT APPOINTMENT. ROSSI LONG CONSULTING Grass 14.09 14.61 Grass 13.53 14.74 14.36 13.14 13.81 ACCEPTS NO LIABILITY FOR ANY USE OF THIS DOCUMENT OTHER THAN BY 14.00 14.40 13.00 14.01 13.51 Hedge ITS CLIENT AND ONLY FOR THE PURPOSES FOR WHICH IT WAS PREPARED Fence P/W 14.20 TP01 13.07 14.61

13.87 14.83 AND PROVIDED. ONLY WRITTEN DIMENSIONS SHALL BE USED. 13.61 -6 13.94 13.00 14.38 13.34 13.41 9.21x10 m/s 13.40

14.04 14.00 13.62

13.60 12.96

13.86 14.67 Grass Bund © ROSSI LONG CONSULTING 2017. 14.79 13.09

14.82 13.67 13.88 15.04 14.00 14.40 314600N 13.33 314600N 13.30 13.95 Hedge Root Line 14.13 13.77 13.04 13.78 12.97 15.07 13.29 13.89

14.71 13.80

13.75 13.22 13.79

14.50 13.09 13.36 13.70

14.60 Unmade Ground Hedge Root Line 14.20 13.46 13.82 13.93 13.01 13.21 LP TP

13.01

Ridge=17.75m Horse Training Area13.00 14.60 12.96 Grass 13.17 15.06 13.77 13.16 12.96 13.04 13.09 14.63 12.92 12.85 14.40 13.71 13.72

Grass 13.55 13.20 13.08 13.40 13.25 14.26 14.20 Eaves=15.91m 13.16 12.99 13.92 Low Timber Wall 12.85 13.07 12.80 TP03 12.72 12.91 13.81 13.29 12.98

13.52 13.60 -5 13.07 13.15 13.46 13.26 12.74 1.26x1012.74 m/s 12.86 13.70 13.03 12.79 13.00 14.41 13.08 13.08 13.20

15.00 Hedge 13.45 12.80 13.12 13.05 Grass 13.04 14.56 13.09 13.12 12.98 14.06 13.17 13.15 Building 13.09 13.10 13.29 13.20 13.01 13.08 12.93 14.47 13.87 13.13 12.87 12.89 13.10 12.85 12.90 Eaves=15.46m 13.04 13.19 13.15 Gate 13.82 13.17 13.13 13.62 13.14 Track 13.46 13.15 12.83 12.73 Unmade Ground 13.50 13.41 12.85 13.15 12.83 Stump Eaves=15.56m 12.96 12.90 13.36 13.17 14.15 13.15 12.97 12.88 Hedge Building 12.85 14.00 12.85 12.86 13.13 13.00 12.82 14.89 14.52 13.14 13.92 13.39 Ridge=16.71m 13.17 13.16 13.03 13.25 13.15 12.80 13.69 13.09 13.06 13.59 Hedge 13.18 13.12 13.12 13.87 Track 13.19 Ridge=17.74m 13.15 13.16 Grass 13.80 13.47 Ridge=16.66m 13.35 Door Eaves=18.87m Eaves=15.70m 12.92 13.34 13.03 13.16 13.09 13.11

13.29 13.17 13.16 Door 14.29 13.20 12.68 13.36 13.18 Eaves=15.73m Eaves=15.88m Grass 13.18 14.01 13.30 12.78 Eaves=15.62m 13.33 12.81 13.08 Ridge=16.46m 12.63 13.81 Grass 13.29 Hedge 13.19 14.52 13.18 314575N 14.00 13.27 314575N 13.56 13.45 12.83 12.97 14.81 12.70 13.21 Ridge=16.54m

14.43 13.35 13.34 13.37 13.37 13.00 14.20 12.78 12.76

13.69 Ridge=16.71m 13.40 Hedge 13.15 13.60 14.06 13.89 13.39 Building 13.38 12.68

14.40 12.81 12.68 12.79 14.16 13.44 13.28 12.79 13.40 Eaves=15.69m Hedge 13.14 Hedge Unmade Ground 13.50 Hedge Root Line

14.51 13.45 13.42 Eaves=15.72m 12.80 Ridge=19.93m 12.69 13.31 13.28 MH 15.00 13.48 Door 12.76 12.73 13.54 12.84 13.53 13.46 13.63 Eaves=15.65m 13.92 13.46 12.76 13.82 Ridge=16.71m 13.31 Building Hedge 14.11 Eaves=15.77m Ridge=16.53m 13.49 13.48 12.73 Track 13.53 14.37 13.50 13.53 Hedge Root Line 13.51 Eaves=15.53m 12.90 Ridge=17.27m 13.10 12.75 14.52 Eaves=18.76m 15.11 Grass 12.86

13.55 13.56 13.57 13.52 Stump 13.64 13.57 14.06 13.58 Ridge=16.54m 12.78 12.75 13.69 13.90 13.44 13.80 Ridge=17.22m 13.64 14.85 12.89

Grass 14.00 Building Hedge 13.55 12.93 13.59 13.64 13.58 Grass 12.79 14.21 13.74

13.20 12.82 13.67 Eaves=15.94m

14.58 13.60 13.73 13.62 13.63 Eaves=18.74m 13.69 14.33 13.78 12.89 13.61 13.04 13.60 12.80 13.01 STNBBS3 13.95 12.91

Hedge 14.20 13.77 Hedge 12.98 Hedge Ridge=17.27m 13.77 13.62 13.67 Ridge=19.89m 13.53 12.87

14.47 13.79 Concrete ( Possible Cover ) 13.58 12.80 12.80 14.75 12.99 13.14 13.68 13.61

13.85 13.82 13.60 13.56 14.31 13.70 14.40 13.88 EP 13.60 13.58 13.81 13.79 13.65 Door Building 14.51 Grass

13.86 13.84 13.56 14.01 13.57 12.84 13.86 13.58 13.02

Grass 13.72 13.56 12.93 13.63 12.96 13.72 12.95 13.40 Hedge Hedge Eaves=18.76m 12.83 13.46 12.97 13.55 13.53 13.77 Asphalt Patch 13.53 Hedge 13.00 13.33

13.73 13.72 13.60 Temporary Building 13.11 13.07 13.13 Grass Door 12.98 13.66 13.54 12.89 Gate 13.46 13.76 13.51 13.68 13.66 13.37 13.04 Hedge 13.22 13.15 13.97 13.03 12.85 Hedge 14.07 13.89 13.01 13.32 13.71 Hedge 13.69 13.48 13.41 13.07 13.16

13.75 13.52 13.70 13.14 14.31 14.00 13.09 14.44 13.71 314550N Track 13.02 314550N Cabinet 12.28 13.58 13.01 13.62 12.88 13.79 Eaves=17.81m 13.60 13.16 13.15 12.22 Grass 12.13 13.50 13.38 13.13 14.69 13.67 13.42 13.19 13.54 13.12 13.12 12.31 13.71 13.40 DUCT 13.13 12.81 13.18 13.12 13.14

13.67 Ridge=19.48m 13.20

Grass 13.62 13.40 13.65

13.87 13.80 13.60 Fence C/B 13.54 Asphalt 12.20 12.20

13.00 13.10 14.20 13.80 13.73 Grass 13.01

13.35 12.18 13.68 13.61 12.87 13.40 Muck 13.56 13.10 13.31

14.36 13.30 12.41 14.16 Ridge=19.87m 13.00

13.12 14.06 Grass 13.13 13.79 13.63

Eaves=18.81m 13.10 Building 12.34 12.82 13.60 12.23 14.46 13.60 13.80 13.11

13.01 Hedge / Small Trees 13.54 14.20 13.53 13.37 13.07 13.90 Eaves=17.81m Lower Street Eaves=15.05m 13.80 13.83 12.91 13.13 TreeHt = 23.95m 13.35 13.44 Track Building 12.49 14.05 13.54 Ridge=19.50m 13.30 12.28 13.19 12.82 13.13 13.65 13.12 13.17 12.86 13.38 13.13 13.15 12.53 13.03 13.75 12.23 13.58 Fence C/B 13.44 13.31 Hedge 13.87 Unmade Ground 13.17 13.65 13.15 Concrete

14.31 12.50 14.06 13.29 13.14 13.12

Grass 13.60 Footpath Edging

14.20 13.56 14.48 13.30 13.20 13.01 14.14 13.82 12.90

14.30 14.25 Grass 14.38 Grass Village Hall Car Park 12.57 13.22 14.36 13.87 13.43 Building 13.20 13.43 13.97 13.30 Eaves=18.87m 13.23 14.48 12.61 12.48 14.30 13.54 Fence C/B TP 13.63 13.21 12.45 12.34 14.14 13.20 13.43

13.24 13.03 13.00 14.67 13.72 FH 12.60 13.22 12.47 13.84 Water 13.20 14.29 13.88

13.69 13.22 14.45 13.95 Tank 12.97 13.43 14.26 Gate 12.49 12.40

Eaves=17.80m 12.67 13.80

14.35 13.96 13.51 13.21 13.20 13.48 14.22 13.20 FOUL WATER FROM 14.40 13.22 13.21 Hedge 14.27 Unmade Ground Fence C/B 12.39 14.27 13.22 13.21 13.24 Hedge 13.54 12.73 14.39 13.01 DEVELOPMENT PUMPED TO 14.15 13.04 12.69 14.27 13.23 14.26 13.78 13.09 12.73 12.58 13.20 14.36 Ridge=15.60m Hedge / Small Trees 12.59 14.63 13.28 12.62 12.61 13.64 Ridge=19.52m 13.24 PROPOSED MANHOLE PRIOR Footpath Edging 14.27 14.18 13.44 Grass / Muck 12.50 13.06 12.80 13.44 13.05 14.27 13.86 TO GRAVITATING TO EXISTING 13.28 Fence C/B 12.81 12.68 12.60 14.38 Eaves=15.24m 14.26 14.07 14.00 13.45 12.66 13.60 Grass 13.80 13.68 13.21 MP 12.86 12.80 12.67

14.20 13.28 13.06 Building Building PUBLIC SEWER. 12.56 14.32 13.17 12.88 Fence C/B 12.72 12.97 W 13.56 Throughway To Church Ridge=19.46m 13.19 Gate 12.88 314525N 13.40 12.64 12.63 314525N 13.40 Eaves=17.88m 13.12 12.86 12.73 13.47 14.29 12.95 12.91 12.77 12.75 13.39 13.21 Hedge 14.62 14.20 Asphalt 14.02 Overgrown Bushes / Small Trees

13.35 13.17 12.69

13.78 12.93 12.81 12.80 13.62 13.24 12.98 Concrete 13.10 12.79 14.24 W 12.80 13.49 13.15 12.75 14.20 13.35 13.31 12.78 13.36 MH 13.32 12.79 Track 14.18 13.00 Eaves=17.78m Muck / Grass 13.03 13.35 BT 13.33 13.18 MH 14.08 12.86 Unmade Ground 12.85 Grass 13.27 13.26 13.06 12.84 13.20 12.88 13.40 13.12 13.23 12.86 12.88 13.28 14.00 13.85 12.90 13.54 13.39 12.99 12.88 12.86 13.69 13.60 12.93 13.80 12.90 13.15 13.11 Fence C/B 12.91 12.95 14.09 12.89 Thieves Lane 14.49 13.31 12.93 14.05 13.20 12.92 13.04 12.96 Fence 13.15C/B 12.94 12.95 14.00 Gate 13.91 PRELIMINARY DRAWING: 13.16 12.95 12.96 12.99 13.32 12.99 12.96 MH 12.90 13.53 13.30 13.18 13.68 13.13 12.90 Hedge G 12.99 13.21 Muck / Grass 13.23 12.94 13.57 THIS DRAWING IS FOR PRELIMINARY PURPOSES ONLY G 13.10 13.85 Grass Unmade Ground 12.98 12.91 13.90 Fence C/B 13.16 13.50 13.21 Grass 13.38 13.28 13.01 13.20 12.93 12.98 13.79 13.17 13.50 12.97 SP SP SP 13.22 13.38 AND MUST NOT BE READ AS A CONSTRUCTION ISSUE. 13.28 13.43 13.21 13.37 13.40 13.60 13.44 13.80 Hedge Root Line 13.50 13.17 13.15 13.20 F/Path13.41 Edging 13.28 13.35 13.03 14.09 13.29 13.25 13.04 13.73 13.53 13.05 13.00 WATER SEWER 13.47 13.32 13.20 IT INDICATES DESIGN INTENT ONLY AND IS SUBJECT TO Asphalt 13.04 13.09 13.50 13.09 13.29 13.05 12.99

13.26 13.69 13.34 13.30 13.43 EXISTING ANGLIAN WATER FOUL

13.72 13.25 Lay By 13.43 13.31 AMENDMENT DURING FINAL DESIGN DEVELOPMENT. 13.25 13.27 13.66 13.32 13.15 13.29 13.12 13.36 Track 13.39 13.16 13.25 13.13 13.63 Brick Wall 13.84 13.32 13.11 13.49 13.38 13.41 314500N 13.56 Fence C/B 13.29 13.10 314500N Gate 13.16 13.43 13.46

13.43 13.60 13.44 13.29 13.49 13.55 13.62 Muck / Grass 13.35 13.40 Hedge 13.23 PROPOSED MANHOLE 13.47 13.43

13.40 13.44 13.66 P1 PRELIMINARY ISSUE. 11.01.17 EJK RAC 13.37

13.23 13.20 CONNECTION TO EXISTING 13.23 13.18 13.41 13.47

13.90 13.52 13.52 Brick Wall PUBLIC SEWER. 13.36 13.29 13.47 13.50 13.43 REV DESCRIPTION DATE BY AUTH 13.30 13.47 13.50

13.50 Asphalt Fence P/R13.72 13.28 Fence P/R 13.54 Grass 13.31 Fence C/B 13.51 13.48 G 13.31 13.56 13.60

Gate 13.50 13.34 13.38 Muck 13.42 13.55 13.43 13.31 13.50

Hedge13.59 13.52 13.62 Fence P/R13.48 13.46

13.58 13.40 13.40 13.58 13.46 Track 13.44 13.42 13.59 13.60 13.63 13.46 13.40 POST 13.66 13.62 13.44 13.37 13.67 13.42 13.50 13.44 13.51 13.53 13.51 13.37 BT 13.61 13.46 Lay By G 13.39 13.72 Hedge 13.50 13.59 13.67 MH 13.56 13.46

13.56 13.56 13.45

13.75 13.32 13.60 13.57 G 13.51 13.53 MH Fence C/B 13.72 13.54 13.56 13.86 13.81 13.50 13.62 13.64 13.77 13.61 13.77 13.65 13.65 13.45 13.83

13.66 16 Meridian Way, Norwich, Norfolk, NR7 0TA 13.64 13.83 13.66 13.36 314475N Fence P/R 13.64 314475N Grass 13.72

13.66 T: 01603 706 420 F: 01603 706 421 www.rossilong.co.uk 13.56 Asphalt 13.51 13.86 13.93 13.93 Footpath Edging 13.68

13.70 Muck 13.74 13.42 13.91 13.71 13.49 Fence C/B 13.71

13.60 W MH 13.79 13.42 13.76 13.75 CLIENT 13.51 Low BrickW Wall 13.95 13.79

13.97 13.76 13.84 13.80 13.57 14.02 MH 13.67 13.78 14.00 13.54 13.99 13.82

13.81 13.82 13.60 14.05 13.83 STNBBS2 13.82 13.81 13.83 Hedge G 13.75 13.65 13.79 13.76 14.15 13.81 13.71 WOODBASTWICK ESTATE 13.65 13.89 14.08 13.95

13.80 13.98 14.20 SURFACE WATER DRAINAGE STRATEGY

13.80 13.87

13.80 13.74 14.00 13.91

Track

13.97 14.25 13.83 Hedge 14.28 Brick Wall Pier

14.15 14.29 14.19 13.99 14.20 14.05

14.00 14.30 Lay By 14.05 14.31 13.93

13.99 14.28 14.00 Bricks 14.28 14.25 ALL ROOF DRAINAGE TO SOAKAWAYS. 14.29 14.08 14.20 14.33 14.10 14.03 Brick Wall Pier 14.29 14.09

14.45

14.26 14.29

14.28 Asphalt 14.07 14.41 14.40 Fence C/B 14.01WATER SEWER 14.36 14.04 14.53 14.53 14.21 14.23 14.18 14.53 14.34 14.48 G Fence C/B 14.20

14.42 14.01 14.04

14.03 14.60 14.43 EXISTING ANGLIAN WATER FOUL

14.09 PROJECT

14.62 14.05 14.61 14.40 14.06 ALL ROADS AND DRIVEWAYS TO BE CONSTRUCTED USING PERMEABLE PAVING. 14.36 14.67

14.70 Grass 14.20 14.80 14.47 14.41 14.27 14.82 Hedge 14.12 14.71 14.73 Grass 14.51 14.50

14.48 W 14.97 POST 14.20 14.86 14.78 14.86 14.99 14.75 15.00 14.46 14.30 Track 14.25 RESIDENTIAL DEVELOPMENT 14.65 14.64 14.29 14.50 14.87 Hedge Root Line 14.52 14.50 314450N 14.96 14.48 14.34 314450N 14.59 14.46 Bushes 14.38

14.35 Overgrown 14.37 14.52 14.47 14.59 14.35 14.60 14.33 LOWER STREET 14.39 15.06 Sub Station 14.36 Asphalt BT 14.34

14.89 14.49 14.40 14.48

14.37 14.58 14.54 14.37

14.78 14.37 14.35 SALHOUSE

14.62 14.40 14.69

14.66 14.43 14.42 14.60 TITLE 14.43

14.60 14.61 14.67 Fence P/R 14.68 G 14.62 14.43 14.48 14.46 Gate 14.50 G 14.47 Asphalt 14.45 W 14.58 14.49 FOUL AND SURFACE WATER Bricks 14.59 Brick Wall 14.52 14.49 14.50 14.58 14.52 14.91 14.53 14.70 SV 14.53 14.70 14.51

14.66 14.50 14.54 DRAINAGE STRATEGY 14.73 14.61

14.75 14.56

14.71 14.73 14.75 14.57 14.58 MH 14.61

14.60 14.60 14.55 14.78 14.58

14.61 14.58 14.80 14.78 14.62 STNBBS1 14.92 14.75 14.59

14.69 14.86 14.80 14.82 314425N 14.74 314425N 14.70

14.97 15.00 15.04 DRAWN AUTHORISED DATE SCALE AT A1 14.73 MH Fence P/R 14.90 14.80 14.90 14.63 14.67 15.11 15.12 14.83 14.88 14.86 14.74

14.76 14.78 14.93 15.20 15.18 15.04 EJK RAC 11.01.17 1:500 Asphalt 15.27 Cheyney Avenue 14.71 15.17 14.68

14.92 14.85 14.71 REV 14.70 PROJECT NO. DRAWING NO. 15.25

14.94 14.67 14.89 14.75 Lower Street FOUL WATER DRAINAGE STRATEGY 14.78 151540 CL-100 P1 14.72

ALL FOUL WATER TO PUBLIC SEWER. STAGE:- PRELIMINARY A1

Woodbastwick Estate Lower Street, Salhouse

Appendix F – Surface Water Drainage Calculations

Flood Risk Assessment January 2017 26 Rossi Long Consulting Ltd Page 1 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 50m2 Date 11.01.17 Designed by EJK File S-A 50M2.srcx Checked by XP Solutions Source Control 2016.1

Summary of Results for 100 year Return Period (+40%)

Half Drain Time : 557 minutes.

Storm Max Max Max Max Status Event Level Depth Infiltration Volume (m) (m) (l/s) (m³)

15 min Summer 13.335 0.335 0.0 1.3 O K 30 min Summer 13.435 0.435 0.0 1.7 O K 60 min Summer 13.531 0.531 0.0 2.0 O K 120 min Summer 13.615 0.615 0.0 2.3 O K 180 min Summer 13.651 0.651 0.0 2.5 O K 240 min Summer 13.666 0.666 0.0 2.5 O K 360 min Summer 13.671 0.671 0.0 2.6 O K 480 min Summer 13.667 0.667 0.0 2.5 O K 600 min Summer 13.661 0.661 0.0 2.5 O K 720 min Summer 13.654 0.654 0.0 2.5 O K 960 min Summer 13.636 0.636 0.0 2.4 O K 1440 min Summer 13.596 0.596 0.0 2.3 O K 2160 min Summer 13.539 0.539 0.0 2.0 O K 2880 min Summer 13.489 0.489 0.0 1.9 O K 4320 min Summer 13.406 0.406 0.0 1.5 O K 5760 min Summer 13.339 0.339 0.0 1.3 O K 7200 min Summer 13.285 0.285 0.0 1.1 O K 8640 min Summer 13.240 0.240 0.0 0.9 O K 10080 min Summer 13.202 0.202 0.0 0.8 O K 15 min Winter 13.376 0.376 0.0 1.4 O K

Storm Rain Flooded Time-Peak Event (mm/hr) Volume (mins) (m³)

15 min Summer 138.634 0.0 19 30 min Summer 90.866 0.0 34 60 min Summer 56.713 0.0 64 120 min Summer 34.190 0.0 122 180 min Summer 25.088 0.0 182 240 min Summer 20.020 0.0 242 360 min Summer 14.528 0.0 358 480 min Summer 11.570 0.0 408 600 min Summer 9.690 0.0 470 720 min Summer 8.380 0.0 534 960 min Summer 6.658 0.0 666 1440 min Summer 4.807 0.0 940 2160 min Summer 3.465 0.0 1360 2880 min Summer 2.744 0.0 1760 4320 min Summer 1.973 0.0 2552 5760 min Summer 1.559 0.0 3296 7200 min Summer 1.298 0.0 4040 8640 min Summer 1.118 0.0 4760 10080 min Summer 0.985 0.0 5544 15 min Winter 138.634 0.0 19

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 2 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 50m2 Date 11.01.17 Designed by EJK File S-A 50M2.srcx Checked by XP Solutions Source Control 2016.1

Summary of Results for 100 year Return Period (+40%)

Storm Max Max Max Max Status Event Level Depth Infiltration Volume (m) (m) (l/s) (m³)

30 min Winter 13.488 0.488 0.0 1.9 O K 60 min Winter 13.598 0.598 0.0 2.3 O K 120 min Winter 13.694 0.694 0.1 2.6 O K 180 min Winter 13.736 0.736 0.1 2.8 O K 240 min Winter 13.756 0.756 0.1 2.9 O K 360 min Winter 13.768 0.768 0.1 2.9 O K 480 min Winter 13.763 0.763 0.1 2.9 O K 600 min Winter 13.753 0.753 0.1 2.9 O K 720 min Winter 13.745 0.745 0.1 2.8 O K 960 min Winter 13.722 0.722 0.1 2.7 O K 1440 min Winter 13.666 0.666 0.0 2.5 O K 2160 min Winter 13.585 0.585 0.0 2.2 O K 2880 min Winter 13.514 0.514 0.0 2.0 O K 4320 min Winter 13.400 0.400 0.0 1.5 O K 5760 min Winter 13.312 0.312 0.0 1.2 O K 7200 min Winter 13.243 0.243 0.0 0.9 O K 8640 min Winter 13.187 0.187 0.0 0.7 O K 10080 min Winter 13.142 0.142 0.0 0.5 O K

Storm Rain Flooded Time-Peak Event (mm/hr) Volume (mins) (m³)

30 min Winter 90.866 0.0 33 60 min Winter 56.713 0.0 62 120 min Winter 34.190 0.0 120 180 min Winter 25.088 0.0 178 240 min Winter 20.020 0.0 236 360 min Winter 14.528 0.0 346 480 min Winter 11.570 0.0 450 600 min Winter 9.690 0.0 486 720 min Winter 8.380 0.0 558 960 min Winter 6.658 0.0 714 1440 min Winter 4.807 0.0 1022 2160 min Winter 3.465 0.0 1452 2880 min Winter 2.744 0.0 1876 4320 min Winter 1.973 0.0 2684 5760 min Winter 1.559 0.0 3464 7200 min Winter 1.298 0.0 4248 8640 min Winter 1.118 0.0 4936 10080 min Winter 0.985 0.0 5656

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 3 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 50m2 Date 11.01.17 Designed by EJK File S-A 50M2.srcx Checked by XP Solutions Source Control 2016.1

Rainfall Details

Rainfall Model FSR Winter Storms Yes Return Period (years) 100 Cv (Summer) 0.750 Region England and Wales Cv (Winter) 0.840 M5-60 (mm) 20.000 Shortest Storm (mins) 15 Ratio R 0.404 Longest Storm (mins) 10080 Summer Storms Yes Climate Change % +40

Time Area Diagram

Total Area (ha) 0.005

Time (mins) Area From: To: (ha)

0 4 0.005

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 4 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 50m2 Date 11.01.17 Designed by EJK File S-A 50M2.srcx Checked by XP Solutions Source Control 2016.1

Model Details

Storage is Online Cover Level (m) 14.500

Trench Soakaway Structure

Infiltration Coefficient Base (m/hr) 0.03316 Trench Width (m) 1.0 Infiltration Coefficient Side (m/hr) 0.03316 Trench Length (m) 4.0 Safety Factor 2.0 Slope (1:X) 0.0 Porosity 0.95 Cap Volume Depth (m) 0.000 Invert Level (m) 13.000 Cap Infiltration Depth (m) 0.000

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 5 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 100m2 Date 11.01.17 Designed by EJK File S-A 100M2.srcx Checked by XP Solutions Source Control 2016.1

Summary of Results for 100 year Return Period (+40%)

Half Drain Time : 579 minutes.

Storm Max Max Max Max Status Event Level Depth Infiltration Volume (m) (m) (l/s) (m³)

15 min Summer 13.336 0.336 0.1 2.6 O K 30 min Summer 13.435 0.435 0.1 3.3 O K 60 min Summer 13.533 0.533 0.1 4.0 O K 120 min Summer 13.618 0.618 0.1 4.7 O K 180 min Summer 13.655 0.655 0.1 5.0 O K 240 min Summer 13.672 0.672 0.1 5.1 O K 360 min Summer 13.680 0.680 0.1 5.2 O K 480 min Summer 13.676 0.676 0.1 5.1 O K 600 min Summer 13.670 0.670 0.1 5.1 O K 720 min Summer 13.663 0.663 0.1 5.0 O K 960 min Summer 13.646 0.646 0.1 4.9 O K 1440 min Summer 13.607 0.607 0.1 4.6 O K 2160 min Summer 13.551 0.551 0.1 4.2 O K 2880 min Summer 13.502 0.502 0.1 3.8 O K 4320 min Summer 13.419 0.419 0.1 3.2 O K 5760 min Summer 13.351 0.351 0.1 2.7 O K 7200 min Summer 13.296 0.296 0.1 2.2 O K 8640 min Summer 13.249 0.249 0.1 1.9 O K 10080 min Summer 13.210 0.210 0.1 1.6 O K 15 min Winter 13.376 0.376 0.1 2.9 O K

Storm Rain Flooded Time-Peak Event (mm/hr) Volume (mins) (m³)

15 min Summer 138.634 0.0 19 30 min Summer 90.866 0.0 34 60 min Summer 56.713 0.0 64 120 min Summer 34.190 0.0 122 180 min Summer 25.088 0.0 182 240 min Summer 20.020 0.0 242 360 min Summer 14.528 0.0 360 480 min Summer 11.570 0.0 420 600 min Summer 9.690 0.0 480 720 min Summer 8.380 0.0 542 960 min Summer 6.658 0.0 674 1440 min Summer 4.807 0.0 952 2160 min Summer 3.465 0.0 1364 2880 min Summer 2.744 0.0 1764 4320 min Summer 1.973 0.0 2552 5760 min Summer 1.559 0.0 3344 7200 min Summer 1.298 0.0 4104 8640 min Summer 1.118 0.0 4840 10080 min Summer 0.985 0.0 5544 15 min Winter 138.634 0.0 19

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 6 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 100m2 Date 11.01.17 Designed by EJK File S-A 100M2.srcx Checked by XP Solutions Source Control 2016.1

Summary of Results for 100 year Return Period (+40%)

Storm Max Max Max Max Status Event Level Depth Infiltration Volume (m) (m) (l/s) (m³)

30 min Winter 13.489 0.489 0.1 3.7 O K 60 min Winter 13.599 0.599 0.1 4.6 O K 120 min Winter 13.697 0.697 0.1 5.3 O K 180 min Winter 13.741 0.741 0.1 5.6 O K 240 min Winter 13.762 0.762 0.1 5.8 O K 360 min Winter 13.777 0.777 0.1 5.9 O K 480 min Winter 13.775 0.775 0.1 5.9 O K 600 min Winter 13.765 0.765 0.1 5.8 O K 720 min Winter 13.756 0.756 0.1 5.7 O K 960 min Winter 13.735 0.735 0.1 5.6 O K 1440 min Winter 13.682 0.682 0.1 5.2 O K 2160 min Winter 13.602 0.602 0.1 4.6 O K 2880 min Winter 13.532 0.532 0.1 4.0 O K 4320 min Winter 13.416 0.416 0.1 3.2 O K 5760 min Winter 13.327 0.327 0.1 2.5 O K 7200 min Winter 13.255 0.255 0.1 1.9 O K 8640 min Winter 13.197 0.197 0.1 1.5 O K 10080 min Winter 13.150 0.150 0.0 1.1 O K

Storm Rain Flooded Time-Peak Event (mm/hr) Volume (mins) (m³)

30 min Winter 90.866 0.0 33 60 min Winter 56.713 0.0 62 120 min Winter 34.190 0.0 120 180 min Winter 25.088 0.0 178 240 min Winter 20.020 0.0 236 360 min Winter 14.528 0.0 348 480 min Winter 11.570 0.0 454 600 min Winter 9.690 0.0 540 720 min Winter 8.380 0.0 568 960 min Winter 6.658 0.0 722 1440 min Winter 4.807 0.0 1026 2160 min Winter 3.465 0.0 1472 2880 min Winter 2.744 0.0 1900 4320 min Winter 1.973 0.0 2724 5760 min Winter 1.559 0.0 3512 7200 min Winter 1.298 0.0 4256 8640 min Winter 1.118 0.0 5016 10080 min Winter 0.985 0.0 5744

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 7 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 100m2 Date 11.01.17 Designed by EJK File S-A 100M2.srcx Checked by XP Solutions Source Control 2016.1

Rainfall Details

Time Area Diagram

Total Area (ha) 0.010

Time (mins) Area From: To: (ha)

0 4 0.010

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 8 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 100m2 Date 11.01.17 Designed by EJK File S-A 100M2.srcx Checked by XP Solutions Source Control 2016.1

Model Details

Storage is Online Cover Level (m) 14.500

Trench Soakaway Structure

Infiltration Coefficient Base (m/hr) 0.03316 Trench Width (m) 1.0 Infiltration Coefficient Side (m/hr) 0.03316 Trench Length (m) 8.0 Safety Factor 2.0 Slope (1:X) 0.0 Porosity 0.95 Cap Volume Depth (m) 0.000 Invert Level (m) 13.000 Cap Infiltration Depth (m) 0.000

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 9 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 150m2 Date 11.01.17 Designed by EJK File S-A 150M2.srcx Checked by XP Solutions Source Control 2016.1

Summary of Results for 100 year Return Period (+40%)

Half Drain Time : 758 minutes.

Storm Max Max Max Max Status Event Level Depth Infiltration Volume (m) (m) (l/s) (m³)

15 min Summer 13.310 0.310 0.1 3.8 O K 30 min Summer 13.403 0.403 0.1 5.0 O K 60 min Summer 13.495 0.495 0.1 6.1 O K 120 min Summer 13.578 0.578 0.1 7.1 O K 180 min Summer 13.617 0.617 0.1 7.6 O K 240 min Summer 13.637 0.637 0.1 7.9 O K 360 min Summer 13.653 0.653 0.1 8.1 O K 480 min Summer 13.654 0.654 0.1 8.1 O K 600 min Summer 13.648 0.648 0.1 8.0 O K 720 min Summer 13.642 0.642 0.1 7.9 O K 960 min Summer 13.627 0.627 0.1 7.7 O K 1440 min Summer 13.593 0.593 0.1 7.3 O K 2160 min Summer 13.544 0.544 0.1 6.7 O K 2880 min Summer 13.499 0.499 0.1 6.2 O K 4320 min Summer 13.421 0.421 0.1 5.2 O K 5760 min Summer 13.355 0.355 0.1 4.4 O K 7200 min Summer 13.298 0.298 0.1 3.7 O K 8640 min Summer 13.250 0.250 0.1 3.1 O K 10080 min Summer 13.208 0.208 0.1 2.6 O K 15 min Winter 13.348 0.348 0.1 4.3 O K

Storm Rain Flooded Time-Peak Event (mm/hr) Volume (mins) (m³)

15 min Summer 138.634 0.0 19 30 min Summer 90.866 0.0 34 60 min Summer 56.713 0.0 64 120 min Summer 34.190 0.0 122 180 min Summer 25.088 0.0 182 240 min Summer 20.020 0.0 242 360 min Summer 14.528 0.0 360 480 min Summer 11.570 0.0 480 600 min Summer 9.690 0.0 548 720 min Summer 8.380 0.0 602 960 min Summer 6.658 0.0 724 1440 min Summer 4.807 0.0 994 2160 min Summer 3.465 0.0 1408 2880 min Summer 2.744 0.0 1816 4320 min Summer 1.973 0.0 2632 5760 min Summer 1.559 0.0 3400 7200 min Summer 1.298 0.0 4176 8640 min Summer 1.118 0.0 4920 10080 min Summer 0.985 0.0 5640 15 min Winter 138.634 0.0 19

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 10 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 150m2 Date 11.01.17 Designed by EJK File S-A 150M2.srcx Checked by XP Solutions Source Control 2016.1

Summary of Results for 100 year Return Period (+40%)

Storm Max Max Max Max Status Event Level Depth Infiltration Volume (m) (m) (l/s) (m³)

30 min Winter 13.453 0.453 0.1 5.6 O K 60 min Winter 13.556 0.556 0.1 6.9 O K 120 min Winter 13.651 0.651 0.1 8.0 O K 180 min Winter 13.697 0.697 0.1 8.6 O K 240 min Winter 13.722 0.722 0.1 8.9 O K 360 min Winter 13.745 0.745 0.1 9.2 O K 480 min Winter 13.751 0.751 0.1 9.3 O K 600 min Winter 13.748 0.748 0.1 9.2 O K 720 min Winter 13.740 0.740 0.1 9.1 O K 960 min Winter 13.720 0.720 0.1 8.9 O K 1440 min Winter 13.678 0.678 0.1 8.4 O K 2160 min Winter 13.609 0.609 0.1 7.5 O K 2880 min Winter 13.545 0.545 0.1 6.7 O K 4320 min Winter 13.432 0.432 0.1 5.3 O K 5760 min Winter 13.340 0.340 0.1 4.2 O K 7200 min Winter 13.263 0.263 0.1 3.2 O K 8640 min Winter 13.199 0.199 0.1 2.5 O K 10080 min Winter 13.147 0.147 0.1 1.8 O K

Storm Rain Flooded Time-Peak Event (mm/hr) Volume (mins) (m³)

30 min Winter 90.866 0.0 33 60 min Winter 56.713 0.0 62 120 min Winter 34.190 0.0 120 180 min Winter 25.088 0.0 180 240 min Winter 20.020 0.0 238 360 min Winter 14.528 0.0 352 480 min Winter 11.570 0.0 464 600 min Winter 9.690 0.0 572 720 min Winter 8.380 0.0 672 960 min Winter 6.658 0.0 760 1440 min Winter 4.807 0.0 1068 2160 min Winter 3.465 0.0 1516 2880 min Winter 2.744 0.0 1960 4320 min Winter 1.973 0.0 2808 5760 min Winter 1.559 0.0 3584 7200 min Winter 1.298 0.0 4392 8640 min Winter 1.118 0.0 5104 10080 min Winter 0.985 0.0 5760

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 11 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 150m2 Date 11.01.17 Designed by EJK File S-A 150M2.srcx Checked by XP Solutions Source Control 2016.1

Rainfall Details

Time Area Diagram

Total Area (ha) 0.015

Time (mins) Area From: To: (ha)

0 4 0.015

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 12 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 150m2 Date 11.01.17 Designed by EJK File S-A 150M2.srcx Checked by XP Solutions Source Control 2016.1

Model Details

Storage is Online Cover Level (m) 14.500

Trench Soakaway Structure

Infiltration Coefficient Base (m/hr) 0.03316 Trench Width (m) 2.0 Infiltration Coefficient Side (m/hr) 0.03316 Trench Length (m) 6.5 Safety Factor 2.0 Slope (1:X) 0.0 Porosity 0.95 Cap Volume Depth (m) 0.000 Invert Level (m) 13.000 Cap Infiltration Depth (m) 0.000

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 13 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 200m2 Date 11.01.17 Designed by EJK File S-A 200M2.srcx Checked by XP Solutions Source Control 2016.1

Summary of Results for 100 year Return Period (+40%)

Half Drain Time : 791 minutes.

Storm Max Max Max Max Status Event Level Depth Infiltration Volume (m) (m) (l/s) (m³)

15 min Summer 13.317 0.317 0.1 5.1 O K 30 min Summer 13.411 0.411 0.1 6.6 O K 60 min Summer 13.505 0.505 0.1 8.2 O K 120 min Summer 13.590 0.590 0.1 9.5 O K 180 min Summer 13.631 0.631 0.1 10.2 O K 240 min Summer 13.652 0.652 0.1 10.5 O K 360 min Summer 13.670 0.670 0.1 10.8 O K 480 min Summer 13.672 0.672 0.1 10.9 O K 600 min Summer 13.667 0.667 0.1 10.8 O K 720 min Summer 13.660 0.660 0.1 10.7 O K 960 min Summer 13.645 0.645 0.1 10.4 O K 1440 min Summer 13.612 0.612 0.1 9.9 O K 2160 min Summer 13.562 0.562 0.1 9.1 O K 2880 min Summer 13.518 0.518 0.1 8.4 O K 4320 min Summer 13.439 0.439 0.1 7.1 O K 5760 min Summer 13.371 0.371 0.1 6.0 O K 7200 min Summer 13.313 0.313 0.1 5.1 O K 8640 min Summer 13.264 0.264 0.1 4.3 O K 10080 min Summer 13.221 0.221 0.1 3.6 O K 15 min Winter 13.355 0.355 0.1 5.7 O K

Storm Rain Flooded Time-Peak Event (mm/hr) Volume (mins) (m³)

15 min Summer 138.634 0.0 19 30 min Summer 90.866 0.0 34 60 min Summer 56.713 0.0 64 120 min Summer 34.190 0.0 122 180 min Summer 25.088 0.0 182 240 min Summer 20.020 0.0 242 360 min Summer 14.528 0.0 362 480 min Summer 11.570 0.0 480 600 min Summer 9.690 0.0 560 720 min Summer 8.380 0.0 614 960 min Summer 6.658 0.0 740 1440 min Summer 4.807 0.0 998 2160 min Summer 3.465 0.0 1408 2880 min Summer 2.744 0.0 1820 4320 min Summer 1.973 0.0 2636 5760 min Summer 1.559 0.0 3408 7200 min Summer 1.298 0.0 4176 8640 min Summer 1.118 0.0 4928 10080 min Summer 0.985 0.0 5648 15 min Winter 138.634 0.0 19

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 14 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 200m2 Date 11.01.17 Designed by EJK File S-A 200M2.srcx Checked by XP Solutions Source Control 2016.1

Summary of Results for 100 year Return Period (+40%)

Storm Max Max Max Max Status Event Level Depth Infiltration Volume (m) (m) (l/s) (m³)

30 min Winter 13.462 0.462 0.1 7.5 O K 60 min Winter 13.568 0.568 0.1 9.2 O K 120 min Winter 13.666 0.666 0.1 10.7 O K 180 min Winter 13.713 0.713 0.1 11.5 O K 240 min Winter 13.739 0.739 0.1 11.9 O K 360 min Winter 13.764 0.764 0.2 12.3 O K 480 min Winter 13.772 0.772 0.2 12.5 O K 600 min Winter 13.770 0.770 0.2 12.4 O K 720 min Winter 13.762 0.762 0.2 12.3 O K 960 min Winter 13.742 0.742 0.2 12.0 O K 1440 min Winter 13.700 0.700 0.1 11.3 O K 2160 min Winter 13.632 0.632 0.1 10.2 O K 2880 min Winter 13.567 0.567 0.1 9.2 O K 4320 min Winter 13.453 0.453 0.1 7.3 O K 5760 min Winter 13.359 0.359 0.1 5.8 O K 7200 min Winter 13.280 0.280 0.1 4.5 O K 8640 min Winter 13.214 0.214 0.1 3.5 O K 10080 min Winter 13.160 0.160 0.1 2.6 O K

Storm Rain Flooded Time-Peak Event (mm/hr) Volume (mins) (m³)

30 min Winter 90.866 0.0 33 60 min Winter 56.713 0.0 62 120 min Winter 34.190 0.0 120 180 min Winter 25.088 0.0 180 240 min Winter 20.020 0.0 238 360 min Winter 14.528 0.0 352 480 min Winter 11.570 0.0 464 600 min Winter 9.690 0.0 572 720 min Winter 8.380 0.0 676 960 min Winter 6.658 0.0 770 1440 min Winter 4.807 0.0 1070 2160 min Winter 3.465 0.0 1532 2880 min Winter 2.744 0.0 1964 4320 min Winter 1.973 0.0 2812 5760 min Winter 1.559 0.0 3632 7200 min Winter 1.298 0.0 4392 8640 min Winter 1.118 0.0 5104 10080 min Winter 0.985 0.0 5848

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 15 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 200m2 Date 11.01.17 Designed by EJK File S-A 200M2.srcx Checked by XP Solutions Source Control 2016.1

Rainfall Details

Time Area Diagram

Total Area (ha) 0.020

Time (mins) Area From: To: (ha)

0 4 0.020

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 16 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 200m2 Date 11.01.17 Designed by EJK File S-A 200M2.srcx Checked by XP Solutions Source Control 2016.1

Model Details

Storage is Online Cover Level (m) 14.500

Trench Soakaway Structure

Infiltration Coefficient Base (m/hr) 0.03316 Trench Width (m) 2.0 Infiltration Coefficient Side (m/hr) 0.03316 Trench Length (m) 8.5 Safety Factor 2.0 Slope (1:X) 0.0 Porosity 0.95 Cap Volume Depth (m) 0.000 Invert Level (m) 13.000 Cap Infiltration Depth (m) 0.000

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 17 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 300m2 Date 11.01.17 Designed by EJK File S-A 300M2.srcx Checked by XP Solutions Source Control 2016.1

Summary of Results for 100 year Return Period (+40%)

Half Drain Time : 808 minutes.

Storm Max Max Max Max Status Event Level Depth Infiltration Volume (m) (m) (l/s) (m³)

15 min Summer 13.311 0.311 0.2 7.7 O K 30 min Summer 13.404 0.404 0.2 10.0 O K 60 min Summer 13.496 0.496 0.2 12.2 O K 120 min Summer 13.579 0.579 0.2 14.3 O K 180 min Summer 13.619 0.619 0.2 15.3 O K 240 min Summer 13.640 0.640 0.2 15.8 O K 360 min Summer 13.658 0.658 0.2 16.3 O K 480 min Summer 13.661 0.661 0.2 16.3 O K 600 min Summer 13.656 0.656 0.2 16.2 O K 720 min Summer 13.649 0.649 0.2 16.0 O K 960 min Summer 13.634 0.634 0.2 15.7 O K 1440 min Summer 13.601 0.601 0.2 14.9 O K 2160 min Summer 13.553 0.553 0.2 13.7 O K 2880 min Summer 13.509 0.509 0.2 12.6 O K 4320 min Summer 13.431 0.431 0.2 10.6 O K 5760 min Summer 13.364 0.364 0.2 9.0 O K 7200 min Summer 13.307 0.307 0.2 7.6 O K 8640 min Summer 13.257 0.257 0.2 6.4 O K 10080 min Summer 13.215 0.215 0.1 5.3 O K 15 min Winter 13.348 0.348 0.2 8.6 O K

Storm Rain Flooded Time-Peak Event (mm/hr) Volume (mins) (m³)

15 min Summer 138.634 0.0 19 30 min Summer 90.866 0.0 34 60 min Summer 56.713 0.0 64 120 min Summer 34.190 0.0 122 180 min Summer 25.088 0.0 182 240 min Summer 20.020 0.0 242 360 min Summer 14.528 0.0 362 480 min Summer 11.570 0.0 480 600 min Summer 9.690 0.0 572 720 min Summer 8.380 0.0 618 960 min Summer 6.658 0.0 742 1440 min Summer 4.807 0.0 1008 2160 min Summer 3.465 0.0 1424 2880 min Summer 2.744 0.0 1820 4320 min Summer 1.973 0.0 2636 5760 min Summer 1.559 0.0 3408 7200 min Summer 1.298 0.0 4176 8640 min Summer 1.118 0.0 4928 10080 min Summer 0.985 0.0 5648 15 min Winter 138.634 0.0 19

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 18 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 300m2 Date 11.01.17 Designed by EJK File S-A 300M2.srcx Checked by XP Solutions Source Control 2016.1

Summary of Results for 100 year Return Period (+40%)

Storm Max Max Max Max Status Event Level Depth Infiltration Volume (m) (m) (l/s) (m³)

30 min Winter 13.453 0.453 0.2 11.2 O K 60 min Winter 13.557 0.557 0.2 13.8 O K 120 min Winter 13.653 0.653 0.2 16.1 O K 180 min Winter 13.700 0.700 0.2 17.3 O K 240 min Winter 13.726 0.726 0.2 17.9 O K 360 min Winter 13.751 0.751 0.2 18.5 O K 480 min Winter 13.759 0.759 0.2 18.7 O K 600 min Winter 13.758 0.758 0.2 18.7 O K 720 min Winter 13.750 0.750 0.2 18.5 O K 960 min Winter 13.730 0.730 0.2 18.0 O K 1440 min Winter 13.689 0.689 0.2 17.0 O K 2160 min Winter 13.622 0.622 0.2 15.4 O K 2880 min Winter 13.558 0.558 0.2 13.8 O K 4320 min Winter 13.446 0.446 0.2 11.0 O K 5760 min Winter 13.352 0.352 0.2 8.7 O K 7200 min Winter 13.273 0.273 0.2 6.7 O K 8640 min Winter 13.207 0.207 0.1 5.1 O K 10080 min Winter 13.153 0.153 0.1 3.8 O K

Storm Rain Flooded Time-Peak Event (mm/hr) Volume (mins) (m³)

30 min Winter 90.866 0.0 33 60 min Winter 56.713 0.0 62 120 min Winter 34.190 0.0 120 180 min Winter 25.088 0.0 180 240 min Winter 20.020 0.0 238 360 min Winter 14.528 0.0 352 480 min Winter 11.570 0.0 464 600 min Winter 9.690 0.0 574 720 min Winter 8.380 0.0 678 960 min Winter 6.658 0.0 772 1440 min Winter 4.807 0.0 1080 2160 min Winter 3.465 0.0 1536 2880 min Winter 2.744 0.0 1984 4320 min Winter 1.973 0.0 2812 5760 min Winter 1.559 0.0 3632 7200 min Winter 1.298 0.0 4392 8640 min Winter 1.118 0.0 5104 10080 min Winter 0.985 0.0 5848

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 19 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 300m2 Date 11.01.17 Designed by EJK File S-A 300M2.srcx Checked by XP Solutions Source Control 2016.1

Rainfall Details

Time Area Diagram

Total Area (ha) 0.030

Time (mins) Area From: To: (ha)

0 4 0.030

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 20 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Soakaway - 300m2 Date 11.01.17 Designed by EJK File S-A 300M2.srcx Checked by XP Solutions Source Control 2016.1

Model Details

Storage is Online Cover Level (m) 14.500

Trench Soakaway Structure

Infiltration Coefficient Base (m/hr) 0.03316 Trench Width (m) 2.0 Infiltration Coefficient Side (m/hr) 0.03316 Trench Length (m) 13.0 Safety Factor 2.0 Slope (1:X) 0.0 Porosity 0.95 Cap Volume Depth (m) 0.000 Invert Level (m) 13.000 Cap Infiltration Depth (m) 0.000

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 21 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Permeable Paving Date 11.01.17 Designed by EJK File PERMEABLE PAVING.srcx Checked by XP Solutions Source Control 2016.1

Summary of Results for 100 year Return Period (+40%)

Half Drain Time : 66 minutes.

Storm Max Max Max Max Status Event Level Depth Infiltration Volume (m) (m) (l/s) (m³)

15 min Summer 13.062 0.062 1.4 5.6 O K 30 min Summer 13.081 0.081 1.4 7.3 O K 60 min Summer 13.093 0.093 1.4 8.4 O K 120 min Summer 13.099 0.099 1.4 8.9 O K 180 min Summer 13.097 0.097 1.4 8.7 O K 240 min Summer 13.092 0.092 1.4 8.3 O K 360 min Summer 13.081 0.081 1.4 7.3 O K 480 min Summer 13.071 0.071 1.4 6.4 O K 600 min Summer 13.061 0.061 1.4 5.5 O K 720 min Summer 13.054 0.054 1.4 4.9 O K 960 min Summer 13.046 0.046 1.3 4.1 O K 1440 min Summer 13.036 0.036 1.0 3.2 O K 2160 min Summer 13.027 0.027 0.8 2.5 O K 2880 min Summer 13.022 0.022 0.6 2.0 O K 4320 min Summer 13.017 0.017 0.5 1.5 O K 5760 min Summer 13.013 0.013 0.4 1.2 O K 7200 min Summer 13.011 0.011 0.3 1.0 O K 8640 min Summer 13.010 0.010 0.3 0.9 O K 10080 min Summer 13.008 0.008 0.2 0.7 O K 15 min Winter 13.072 0.072 1.4 6.5 O K

Storm Rain Flooded Time-Peak Event (mm/hr) Volume (mins) (m³)

15 min Summer 138.634 0.0 17 30 min Summer 90.866 0.0 31 60 min Summer 56.713 0.0 54 120 min Summer 34.190 0.0 86 180 min Summer 25.088 0.0 120 240 min Summer 20.020 0.0 154 360 min Summer 14.528 0.0 220 480 min Summer 11.570 0.0 282 600 min Summer 9.690 0.0 340 720 min Summer 8.380 0.0 398 960 min Summer 6.658 0.0 512 1440 min Summer 4.807 0.0 752 2160 min Summer 3.465 0.0 1124 2880 min Summer 2.744 0.0 1472 4320 min Summer 1.973 0.0 2204 5760 min Summer 1.559 0.0 2936 7200 min Summer 1.298 0.0 3664 8640 min Summer 1.118 0.0 4400 10080 min Summer 0.985 0.0 5136 15 min Winter 138.634 0.0 17

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 22 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Permeable Paving Date 11.01.17 Designed by EJK File PERMEABLE PAVING.srcx Checked by XP Solutions Source Control 2016.1

Summary of Results for 100 year Return Period (+40%)

Storm Max Max Max Max Status Event Level Depth Infiltration Volume (m) (m) (l/s) (m³)

30 min Winter 13.094 0.094 1.4 8.5 O K 60 min Winter 13.109 0.109 1.4 9.8 O K 120 min Winter 13.112 0.112 1.4 10.1 O K 180 min Winter 13.107 0.107 1.4 9.7 O K 240 min Winter 13.099 0.099 1.4 8.9 O K 360 min Winter 13.081 0.081 1.4 7.3 O K 480 min Winter 13.065 0.065 1.4 5.9 O K 600 min Winter 13.053 0.053 1.4 4.8 O K 720 min Winter 13.047 0.047 1.3 4.2 O K 960 min Winter 13.039 0.039 1.1 3.5 O K 1440 min Winter 13.029 0.029 0.8 2.6 O K 2160 min Winter 13.021 0.021 0.6 1.9 O K 2880 min Winter 13.017 0.017 0.5 1.5 O K 4320 min Winter 13.012 0.012 0.3 1.1 O K 5760 min Winter 13.010 0.010 0.3 0.9 O K 7200 min Winter 13.008 0.008 0.2 0.7 O K 8640 min Winter 13.007 0.007 0.2 0.6 O K 10080 min Winter 13.006 0.006 0.2 0.5 O K

Storm Rain Flooded Time-Peak Event (mm/hr) Volume (mins) (m³)

30 min Winter 90.866 0.0 31 60 min Winter 56.713 0.0 58 120 min Winter 34.190 0.0 94 180 min Winter 25.088 0.0 132 240 min Winter 20.020 0.0 168 360 min Winter 14.528 0.0 234 480 min Winter 11.570 0.0 296 600 min Winter 9.690 0.0 348 720 min Winter 8.380 0.0 404 960 min Winter 6.658 0.0 524 1440 min Winter 4.807 0.0 766 2160 min Winter 3.465 0.0 1128 2880 min Winter 2.744 0.0 1496 4320 min Winter 1.973 0.0 2240 5760 min Winter 1.559 0.0 2912 7200 min Winter 1.298 0.0 3664 8640 min Winter 1.118 0.0 4408 10080 min Winter 0.985 0.0 5160

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 23 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Permeable Paving Date 11.01.17 Designed by EJK File PERMEABLE PAVING.srcx Checked by XP Solutions Source Control 2016.1

Rainfall Details

Time Area Diagram

Total Area (ha) 0.030

Time (mins) Area From: To: (ha)

0 4 0.030

©1982-2016 XP Solutions Rossi Long Consulting Ltd Page 24 16 Meridian Way Land off Lower Street Norwich Salhouse NR7 0TA Permeable Paving Date 11.01.17 Designed by EJK File PERMEABLE PAVING.srcx Checked by XP Solutions Source Control 2016.1

Model Details

Storage is Online Cover Level (m) 14.500

Porous Car Park Structure

Infiltration Coefficient Base (m/hr) 0.03316 Width (m) 4.8 Membrane Percolation (mm/hr) 1000 Length (m) 62.5 Max Percolation (l/s) 83.3 Slope (1:X) 0.0 Safety Factor 2.0 Depression Storage (mm) 5 Porosity 0.30 Evaporation (mm/day) 3 Invert Level (m) 13.000 Membrane Depth (m) 0