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Flood Risk Assessment Replacement Dwelling 8 the Mead Nazeing New Road

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Flood Risk Assessment Replacement Dwelling 8 the Mead Nazeing New Road Flood Risk Assessment Replacement Dwelling 8 The Mead Nazeing New Road (B194) Broxbourne Hertfordshire EN10 6SS Job No: BLI.2019.13 Date: April 2019 Version 1 Flood Risk Assessment Replacement Dwelling – 8 The Mead, Nazeing New Road, Broxbourne, Herts Revision Schedule Job No. Revision Date Client Details Prepared by BLI.2019.13 Version 1 03.04.2019 Mr. C Drake Planning Richard Martin IEng MICE Director i BLI.2019.13 - Version 1 April 2019 Flood Risk Assessment Replacement Dwelling – 8 The Mead, Nazeing New Road, Broxbourne, Herts Limitations This Report has been prepared by BLI Consulting Engineers Ltd for the sole use of Mr. C Drake (“Client”) in accordance with the Agreement under which our services were performed [letter dated 19 February 2019]. No other warranty, expressed or implied, is made as to the professional advice included in this Report or any other services provided by BLI Consulting Engineers 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 BLI Consulting Engineers 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 BLI Consulting Engineers Ltd has not been independently verified by BLI Consulting Engineers Ltd, unless otherwise stated in the Report. The methodology adopted, and the sources of information used by BLI Consulting Engineers Ltd in providing its services are outlined in this Report. The work described in this Report was undertaken during February 2019 to April 2019 and is based on the conditions encountered and the information available during the said period. 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. BLI Consulting Engineers 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 BLI Consulting Engineers 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. BLI Consulting Engineers Ltd specifically does not guarantee or warrant any estimate or projections contained in this Report. Copyright © This Report is the copyright of BLI Consulting Engineers Ltd. Any unauthorised reproduction, adaption or usage of this report and/or appended documents by any person is strictly prohibited without prior written consent. ii BLI.2019.13 - Version 1 April 2019 Flood Risk Assessment Replacement Dwelling – 8 The Mead, Nazeing New Road, Broxbourne, Herts Table of Contents 1 Introduction ..................................................................................................................................................... 1 2 Development Details ...................................................................................................................................... 2 3 Flood Hazard Review ..................................................................................................................................... 5 4 Flood Risk Mitigation Measures ................................................................................................................. 21 5 Residual Risk ................................................................................................................................................ 25 6 Discussion and Conclusion ........................................................................................................................ 27 Appendices Appendix A Existing Site Layout (Topographical Survey) Appendix B Proposed Development Layout Appendix C Product 4 Environment Agency Flood Data Appendix D Environment Agency – Climate Change Allowance/Procedure Appendix E Climate Change Flood Levels – Stage / Flow Calculations Appendix F Epping Forest District Council – Level 2 SFRA Extract iii BLI.2019.13 - Version 1 April 2019 Flood Risk Assessment Replacement Dwelling – 8 The Mead, Nazeing New Road, Broxbourne, Herts 1 Introduction 1.1 BLI Consulting Engineers Ltd have been commissioned by Mr. C Drake to prepare a Flood Risk Assessment in accordance with the: ■ National Planning Policy Framework (NPPF). ■ Flood Risk and Coastal Change Planning Practice Guidance (PPG). 1.2 This report will form part of the supporting technical documentation to accompany a full planning application comprising of a replacement dwelling and associated hard and soft landscaping areas. 1.3 The application will be submitted by Halladay West Limited to Epping Forest District Council and the purpose of this report shall be to: ■ Provide information on the flood risks associated with the application site and to present appropriate mitigation measures for the proposed development where flood risk has been identified. ■ Assist where possible with the application of the Sequential Test and Exception Test. 1.4 This is to enable the development to obtain planning permission without objection from the Local Planning Authority (LPA) or their statutory consultees and so that the site, its occupants and the surrounding development is at the minimum risk of flooding. 1 BLI.2019.13 - Version 1 April 2019 Flood Risk Assessment Replacement Dwelling – 8 The Mead, Nazeing New Road, Broxbourne, Herts 2 Development Details Site Location 2.1 The application site is located: ■ Site Address: – 8 The Mead, Nazeing New Road (B194), Broxbourne, Hertfordshire ■ Post Code: – EN10 6SS ■ Grid Reference: – TL 905 341 Site Figure 2.1 – Site Location Plan 2 BLI.2019.13 - Version 1 April 2019 Flood Risk Assessment Replacement Dwelling – 8 The Mead, Nazeing New Road, Broxbourne, Herts Site Figure 2.2 – Aerial Photo Existing Site Layout 2.2 The proposed development boundary as indicated in Figure 2.2 above is defined by: ■ Residential dwellings to the north and south. ■ Open grassland to the east with commercial development beyond. ■ Nazeing New Road to the west with dense woodland beyond. 2.3 A topographical survey of the existing site layout has been undertaken by Survey Solutions and a copy of the survey has been included within Appendix A. The site layout currently comprises of a two storey residential dwelling (2-bedroom) together with a garage, impermeable driveway and rear garden area. Vehicle and pedestrian access to the dwelling is achieved via the private driveway leading off Nazeing New Road to the west of the site. 2.4 The Finished Floor Level (FFL) of the existing residential dwelling is set at 24.83m AOD and drops slightly to 24.77m AOD at the rear of the dwelling. The existing external ground levels to the front (west) of the dwelling are circa 24.40m AOD and rise up to circa 24.85m AOD adjacent to Nazeing New Road. The ground levels within the rear garden are slightly lower at a level of circa 24.10m AOD 3 BLI.2019.13 - Version 1 April 2019 Flood Risk Assessment Replacement Dwelling – 8 The Mead, Nazeing New Road, Broxbourne, Herts 2.5 The existing site layout has an impermeable area of approximately 0.019 ha comprising of roof (0.007 ha) and hardstanding (0.012 ha) areas as detailed above. The impermeable area is served by a positive drainage network and it is likely that the drainage network discharges its surface water runoff into a soakaway located within the rear garden. 2.6 The remainder of the site comprises concrete pathways and permeable grass which infiltrates into the ground with a surface water runoff equal to the greenfield runoff rate. Development Proposal 2.7 The proposed development as shown in Appendix B and Figure 2.3 below comprises of: ■ The demolition of the existing built development including the residential dwelling, garage, outbuildings and private driveway. ■ The construction of a new two storey residential dwelling (4-bedroom) in the location of the previous building structure together with a new private driveway. 2.8 Vehicular and pedestrian access to the development will continue to be via Nazeing New Road located to the west of the site. Figure 2.3 – Proposed Development 2.9 The development layout has an impermeable area of approximately 0.025 ha comprising of roof (0.010 ha) and hardstanding (0.015 ha) areas as detailed above. 4 BLI.2019.13 - Version 1 April 2019 Flood Risk Assessment Replacement Dwelling – 8 The Mead, Nazeing New Road, Broxbourne, Herts 3 Flood Hazard Review Source of Flooding 3.1 Fluvial Flooding - is caused by rivers and occurs when the river channel capacity is exceeded by the flow. Most rivers have a natural flood plain which in built up areas is sometimes encroached upon by development. 3.2 The indicative fluvial and tidal flood mapping available on the GOV.UK website and as shown in Figure 3.1 below, demonstrates that the development site is located within Flood Zone 3 in accordance with Table 1 of the Flood Risk and Coastal
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