site ref shw0420 sfra ref 65 site name€¦ · sfra ref 71 site name delafield heights north,...

B127F005-01 B125

Site Ref SHW0420

SFRA Ref 65

Site Name Land to the rear of Quebec Road, High Wycombe

Size (Ha) 0.180

Proposed Development Type Residential

No. Units 5

Fluvial Flood Risk

Fluvial Flood Risk Summary: The site is located within Flood Zone 1.

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Surface Water Flood Risk

Surface Water Flood Risk Summary: The majority of the site is at Very Low or Low risk of surface water flooding, with small around along the southern and western extents at Medium or High risk. A surface water flow path runs along the western extent (Low to Medium risk) with another (of High risk) to the south of the site. The site‐specific FRA would need to consider:

Avoidance of encroachment into the WCDAs

If the development does encroach into the WCDA: o Demonstrate that finished floor levels are above the Medium uFMfSW risk peak

water level (plus an allowance for climate change); o Demonstrate that the flow path can be maintained, or modifications to it as a result

of the development will not detrimentally affect third parties;

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Groundwater Flood Risk

© Copyright JBA Consulting – 2017 Groundwater Flood Risk Summary: The site is located within an area that is at risk of groundwater emergence. Consequently, should the development include basements the planning application should include a site‐specific flood risk assessment to demonstrate how the risk of groundwater flooding will be mitigated. JBA groundwater mapping indicated the groundwater depth beneath the entire site is greater than 5m.

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Sewer Flooding Risk

This site is located in postcode region HP13. The Wycombe DC SRFA Level 1 Update November 2014 indicates that the following numbers of properties have experienced sewer flooding (internally and externally) in this postcode region, based on data provided by Thames Water (to April 2014):

Internal sewer flooding = 6 to 10

External sewer flooding = 11 to 15

Reservoir Failure Flooding Risk

Reservoir Failure Flooding Risk: The site is not within an area at risk of flooding as a result of reservoir failure.

Site 65 (SHW0420) Flood Risk Recommendations

A site‐specific FRA would be required to accompany the planning application for this site because it is located within a WCDA in accordance with NPPF paragraph 103 and Wycombe District Council's relevant policy on flood risk. The FRA should specifically address:

Surface water and groundwater flood risk

Investigate opportunities to provide betterment to properties downstream of the surface water flow path by intercepting and retaining it on‐site

B127F005-01 B129

Site Ref SHW0564

SFRA Ref 71

Site Name Delafield Heights North, Longland Way / Pettifer Way, High Wycombe

Size (Ha) 3.321


No. Units 32

Fluvial Flood Risk

Fluvial Flood Risk Summary: The site is located within Flood Zone 1. It is not at risk of fluvial flooding from the River Wye, it is approximately 900m outside FZ2.

B127F005-01 B130


Surface Water Flood Risk Summary: The majority of the site is at Very Low or Low risk of surface water flooding. A number of existing roads and associated flow paths run through the site, and consequently parts of the site are at High risk. The adjacent Chairborough Road and Chiltern Avenue are at High risk. The site‐specific FRA would need to consider:





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Groundwater Flood Risk Summary: The site is not located within an area that is at risk of groundwater flooding.

Sewer Flooding Risk




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A site‐specific FRA would be required to accompany the planning application for this site because it is greater than 1ha in size in accordance with NPPF Paragraph 103 and located within a WCDA in accordance with NPPF paragraph 103 and Wycombe District Council's relevant policy on flood risk. The FRA should specifically address:

Surface water flood risk


B127F005-01 B133

Site Ref SHW0400

SFRA Ref 72

Site Name Delafield Heights South, Longland Way / Pettifer Way, High Wycombe

Size (Ha) 0.546


No. Units 40

Fluvial Flood Risk


B127F005-01 B134


Surface Water Flood Risk Summary: The site itself is generally at Very Low risk of surface water flooding, with relatively small areas at Low risk towards the west and north of the site. The adjacent Chairborough Road is at High Risk. There is also a flow path running south to north to the east and north of the site, and consequently this land is at High risk.

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Sewer Flooding Risk




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The applicant should address the following as part of the planning application for the site development:

Safe access and egress during a surface water flood event

The opportunity to implement long‐term, catchment‐wide reductions in runoff through SuDS and provision of surface water flood risk betterment to downstream properties by intercepting surface water flow paths through the site

The feasibility of infiltration measures

Risk of surface water flooding

B127F005-01 B137

Site Ref SHW0421

SFRA Ref 78

Site Name Netley Works, 89 Queens Road, High Wycombe

Size (Ha) 0.185


No. Units 11

Fluvial Flood Risk

Fluvial Flood Risk Summary: The site is located within Flood Zone 1. It is not directly at risk of fluvial flooding from the River Wye, it is approximately 85m outside FZ3a.

B127F005-01 B138


Surface Water Flood Risk Summary: The site itself is generally at Low risk of surface water flooding, with a relatively small area at High risk towards the north of the site. The adjacent Gordon Road is at High Risk.

B127F005-01 B139


© Copyright JBA Consulting – 2017 Groundwater Flood Risk Summary: The site is located within an area that is at risk of groundwater emergence. Consequently, should the development include basements the planning application should include a site‐specific flood risk assessment to demonstrate how the risk of groundwater flooding will be mitigated. JBA groundwater mapping indicates the groundwater depth beneath the site is between 0.5m and 5m.

B127F005-01 B140

Sewer Flooding Risk


Internal sewer flooding = 6

External sewer flooding = 13




A site‐specific FRA would be required to accompany the planning application because the site is within a WCDA in accordance with NPPF paragraph 103 and Wycombe District Council's relevant policy on flood risk. The FRA should specifically address:



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Risk of surface water flooding, including the avoidance of development within the Medium and High risk surface water flood extents within the boundary

Risk of groundwater flooding

B127F005-01 B142

Site Ref SHW0561

SFRA Ref 80

Site Name Notcutts Garden Centre, Clay Lane, High Wycombe

Size (Ha) 0.908


No. Units 15

Fluvial Flood Risk


B127F005-01 B143


Surface Water Flood Risk Summary: The majority of the site is at Very Low risk of surface water flooding, with an area towards the east at High risk. The adjacent Clay Lane is at High risk. The uFMfSW identifies a surface water flow path through the site from the north, although there are no properties immediately downstream that might benefit from measures to intercept it.

B127F005-01 B144



Sewer Flooding Risk

This site is located in postcode region SL7. The Wycombe DC SRFA Level 1 Update November 2014 indicates that the following numbers of properties have experienced sewer flooding (internally and externally) in this postcode region, based on data provided by Thames Water (to April 2014):



B127F005-01 B145








Develop the site in such a manner to avoid encroachment into Medium and High risk surface water flood risk zones. If the development does encroach into the WCDA:

o Demonstrate that finished floor levels are above the Medium uFMfSW risk peak water level (plus an allowance for climate change);

o Demonstrate that the flow path can be maintained, or modifications to it as a result of the development will not detrimentally affect third parties;

B127F005-01 B146

Site Ref SHW0406

SFRA Ref 81

Site Name Ogilvie Road, High Wycombe

Size (Ha) 0.209


No. Units 9

Fluvial Flood Risk

Fluvial Flood Risk Summary: The site is located within Flood Zone 1. It is not directly at risk of fluvial flooding from the River Wye, it is approximately 170m outside FZ2.

B127F005-01 B147


Surface Water Flood Risk Summary: The majority of the site is at Very Low risk of surface water flooding, with an area towards the east at High risk, which may be the result of rainfall filling a depression as a result of the modelling used to develop the flood extents. The adjacent Lindsay Avenue is at Low risk.

B127F005-01 B148


© Copyright JBA Consulting – 2017 Groundwater Flood Risk Summary: The site is located within an area that is at risk of groundwater emergence. Consequently, should the development include basements the planning application should include a site‐specific flood risk assessment to demonstrate how the risk of groundwater flooding will be mitigated. JBA groundwater mapping indicates the groundwater depth beneath the site is between 0.5m and 5m.

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Sewer Flooding Risk









The opportunity to implement long‐term, catchment‐wide reductions in runoff through SuDS


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Risk of surface water flooding, avoiding encroachment into the WCDA


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Site Ref HW21

SFRA Ref 86

Site Name Land at Queensway, Hazlemere, High Wycombe

Size (Ha) 3.965

Proposed Development Type Cemetery

No. Units n/a

Fluvial Flood Risk


B127F005-01 B152


Surface Water Flood Risk Summary: The site itself is not at risk of surface water flooding; Amersham Road to the north is at High risk.

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Sewer Flooding Risk




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Site 86 (SHZ0041) Flood Risk Recommendations

A site‐specific FRA would be required to accompany the planning application for this site because it is greater than 1ha in size in accordance with NPPF Paragraph 103. The applicant should address the following as part of the planning application for the site development:

Consideration of safe access during a surface water flood event if access is via Queensway

B127F005-01 B155

Site Ref RUR10

SFRA Ref 97

Site Name Land to the Rear of Stokenchurch Business Park, Mill Lane, Stokenchurch

Size (Ha) 2.922

Proposed Development Type Business

No. Units n/a

Fluvial Flood Risk


B127F005-01 B156


Surface Water Flood Risk Summary: The site itself is at Very Low risk of surface water flooding. A section of the adjacent M40 motorway is at Medium to High risk.

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Sewer Flooding Risk




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Site 97 (SSC0043) Flood Risk Recommendations


Safe access and egress during a surface water flood event if access is via the south‐west

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Site Ref RUR12

SFRA Ref 101

Site Name Uplands Conference Centre, Four Ashes, Cryers Hill

Size (Ha) 7.608


No. Units 59

Fluvial Flood Risk


B127F005-01 B160


Surface Water Flood Risk Summary: The site itself is at Very Low risk of surface water flooding with a small area at Medium Risk in the centre of the site, adjacent to the existing building.

B127F005-01 B161


Groundwater Flood Risk Summary: The site is located within an area that is at very low risk of groundwater emergence.

Sewer Flooding Risk




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Site 101 Flood Risk Recommendations



B127F005-01 B163

Site Ref SBE0050

SFRA Ref 105

Site Name Windrush House, Bourne End

Size (Ha) 0.149


No. Units 8

Fluvial Flood Risk

Fluvial Flood Risk Summary: The site is located within Flood Zone 1. It is not directly at risk of fluvial flooding from a tributary to the Thames (Lower) or the River Wye, it is approximately 280m outside FZ2.

B127F005-01 B164


Surface Water Flood Risk Summary: Both the site and the adjacent Roman Way are at High risk of surface water flooding.

B127F005-01 B165


© Copyright JBA Consulting – 2017 Groundwater Flood Risk Summary: The site is located within an area that is at risk of groundwater emergence. Consequently, should the development include basements the planning application should include a site‐specific flood risk assessment to demonstrate how the risk of groundwater flooding will be mitigated. JBA groundwater mapping indicates groundwater depths of between 0.5m and 5m.

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Sewer Flooding Risk






Site 105 (SBE0050) Flood Risk Recommendations




water level (plus an allowance for climate change); o Demonstrate that the flow path can be maintained, or modifications to it as a

B127F005-01 B167

result of the development will not detrimentally affect third parties;



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Site Ref HW16

SFRA Ref 107

Site Name Wycombe Airpark 1 Intensification Sites

Size (Ha) 12.992

Proposed Development Type Industrial

No. Units n/a

Fluvial Flood Risk


B127F005-01 B169


Surface Water Flood Risk Summary: The site is at Very Low risk of surface water flooding. Very small areas within the site boundary are at Low to High risk.

B127F005-01 B170



Sewer Flooding Risk

This site is located in on the border between postcode regions SL7 and HP14. The Wycombe DC SRFA Level 1 Update November 2014 indicates that the following numbers of properties have experienced sewer flooding (internally and externally) in this postcode region, based on data provided by Thames Water (to April 2014):



B127F005-01 B171



Site 107 (Wycombe Ai) Flood Risk Recommendations

A site‐specific FRA would be required to accompany the planning application for this site because it is greater than 1ha in size in accordance with NPPF Paragraph 103 and Wycombe District Council's relevant policy on flood risk. The FRA should specifically address:

Develop the site in such a way as to avoid encroachment into High and Medium risk surface water flood risk areas based on the uFMfSW

B127F005-01 B172

Site Ref HW16(b)

SFRA Ref 108

Site Name Wycombe Airpark 2 Southern Expansion Area

Size (Ha) 15.51

Proposed Development Type Industrial

No. Units n/a

Fluvial Flood Risk


B127F005-01 B173


Surface Water Flood Risk Summary: The site itself is at Very Low risk of surface water flooding, the adjacent Clay Lane is at High risk.

B127F005-01 B174



Sewer Flooding Risk




B127F005-01 B175



Site 108 (Wycombe Ai) Flood Risk Recommendations

A site‐specific FRA would be required to accompany the planning application for this site because it is greater than 1ha in size in accordance with NPPF Paragraph 103.

B127F005-01 B176

Site Ref PR13

SFRA Ref 111

Site Name Town Centre site: Land fronting New Road (Back Lane), Princes Risborough

Size (Ha) 2.066

Proposed Development Type Mixed use (retail and employment)

No. Units N/A

Fluvial Flood Risk

Fluvial Flood Risk Summary: The site is located within Flood Zone 1. It is not at risk of fluvial flooding from the nearby watercourse, it is approximately 660m outside FZ3a.

B127F005-01 B177


Surface Water Flood Risk Summary: The majority of the site is at Very Low or Low risk of surface water flooding, with some relatively small areas at Medium risk. The adjacent High Street to the southwest and A4010 to the southeast are at High risk.

B127F005-01 B178


Groundwater Flood Risk Summary: The site is located within an area that is at risk of groundwater emergence. Consequently, should the development include basements the planning application should include a site‐specific flood risk assessment to demonstrate how the risk of groundwater flooding will be mitigated.

Sewer Flooding Risk




B127F005-01 B179






The opportunity to implement long‐term, catchment‐wide reductions in runoff through SuDS




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Site Ref PR14

SFRA Ref 112

Site Name Town Centre site: Land south of Horns Lane, Princes Risborough

Size (Ha) 0.48

Proposed Development Type Mixed use (retail and employment)

No. Units N/A

Fluvial Flood Risk

Fluvial Flood Risk Summary: The site is located within Flood Zone 1. It is not at risk of fluvial flooding from the nearby watercourse, it is approximately 730m outside FZ2.

B127F005-01 B181


Surface Water Flood Risk Summary: The majority of the site is at Very Low or Low risk of surface water flooding, with an area at Medium to High risk (designated as WCDA) towards the northwest. The adjacent A4010 is at High risk. A site specific FRA should consider the following:





B127F005-01 B182


Groundwater Flood Risk Summary: The site is located within an area that is at risk of groundwater emergence. Consequently, should the development include basements the planning application should include a site‐specific flood risk assessment to demonstrate how the risk of groundwater flooding will be mitigated.

Sewer Flooding Risk




B127F005-01 B183




A site‐specific FRA would be required to accompany the planning application because the site is at risk of groundwater flooding and located within a WCDA in accordance with NPPF paragraph 103 and Wycombe District Council's relevant policy on flood risk. The FRA should specifically address:






B127F005-01 B184

Site Ref PR15

SFRA Ref 114

Site Name Molins Sports Ground

Size (Ha) 4.294

Proposed Development Type Outdoor sports

No. Units 0

Fluvial Flood Risk

Fluvial Flood Risk Summary: The site is located within Flood Zone 1. The site is bounded by an ordinary watercourse to east. This does not have a flood zone attributed to it, but that may be a result of the scale of flood mapping. A site‐specific FRA would need to consider the risk of flooding from this watercourse and potentially include hydraulic modelling to confirm the risk.

B127F005-01 B185


Surface Water Flood Risk Summary: The majority of the site is at Very Low or Low risk of surface water flooding, with an area at Medium risk towards the west. The adjacent Mill Lane and Crowbrook Road are at High risk.

B127F005-01 B186


Groundwater Flood Risk Summary: The site is located within an area that is at risk of groundwater emergence.

B127F005-01 B187

Sewer Flooding Risk




B127F005-01 B188








Risk of fluvial flooding from Non‐Main River watercourses



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Site Ref SSC0012

SFRA Ref 124

Site Name Westside Fruit / the Apple orchard, Clay lane

Size (Ha) 0.623


No. Units 11

Fluvial Flood Risk


B127F005-01 B190


Surface Water Flood Risk Summary: The site itself is at Very Low risk of surface water flooding, a section of the adjacent Clay Lane is at High risk.

B127F005-01 B191



Sewer Flooding Risk




B127F005-01 B192






B127F005-01 B193

Site Ref HW11

SFRA Ref 128

Site Name Clay Lane Booker

Size (Ha) 1.973


No. Units 30

Fluvial Flood Risk


B127F005-01 B194


Surface Water Flood Risk Summary: The site itself is at Very Low risk of surface water flooding, the adjacent Clay Hill is at Medium risk. A section of Clay Lane is at High risk.

B127F005-01 B195



Sewer Flooding Risk




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Safe access and egress during a surface water flood event if via Clay Lane

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Site Ref RUR9

SFRA Ref 129

Site Name Land at Wood Farm, Stokenchurch

Size (Ha) 0.645


No. Units 28

Fluvial Flood Risk


B127F005-01 B198


Surface Water Flood Risk Summary: The site itself is at Very Low to Low risk of surface water flooding. Sections of the adjacent Oxford Road and nearby M40 motorway are at Medium to High risk.

B127F005-01 B199



Sewer Flooding Risk




B127F005-01 B200




None

B127F005-01 B201

Site Ref HW14

SFRA Ref 132

Site Name Highbury Works/Hazlemere Coach Works, Chestnut Lane, Hazlemere, High Wycombe

Size (Ha) 0.619

Proposed Development Type Mixed use (residential, employment and community uses)

No. Units 14 (residential)

Fluvial Flood Risk


B127F005-01 B202


Surface Water Flood Risk Summary: The site is generally at Very Low risk of surface water flooding, with very small areas at Low risk. Parts of the local road network are at High risk (e.g. Amersham Road and Eastern Dene).

B127F005-01 B203



Sewer Flooding Risk




B127F005-01 B204






B127F005-01 B205

Site Ref RUR11

SFRA Ref 133

Site Name Land at Heavens Above, 16 High Heavens Wood

Size (Ha) 1.137


No. Units 20

Fluvial Flood Risk


B127F005-01 B206


Surface Water Flood Risk Summary: The majority of the site is at Very Low risk of surface water flooding. There is a flow path running west to east through the site (designated a WCDA). Consequently, this part of the site is at Medium to Low risk. The nearby Marlow Bottom is at High risk.

B127F005-01 B207



Sewer Flooding Risk




B127F005-01 B208







water level (plus an allowance for climate change); o Demonstrate that the flow path can be maintained, or modifications to it as a

result of the development will not detrimentally affect third parties;





B127F005-01 B209

Site Ref RUR5

SFRA Ref 138

Site Name Land at Sidney House

Size (Ha) 1.131


No. Units TBC

Fluvial Flood Risk


B127F005-01 B210


Surface Water Flood Risk Summary: The majority of the site is at Very Low risk of surface water flooding, with an area at Low risk towards the east. There are two significant flow paths near to the site, and consequently areas surrounding the site are at High risk.

B127F005-01 B211



Sewer Flooding Risk




B127F005-01 B212





Avoidance of areas of Low surface water flood risk, where possible

B127F005-01 B213

Site Ref HW19

SFRA Ref 139

Site Name Office Outlet site, Queen Alexandra Road

Size (Ha) 0.45

Proposed Development Type Retail and Employment

No. Units TBC

Fluvial Flood Risk


B127F005-01 B214


Surface Water Flood Risk Summary: The majority of the site is at Low and Very Low risk of surface water flooding, with an area along the eastern boundary at Medium and High risk. Queen Alexandra Road to the north of the site is at High risk of surface water flooding while the A404 is predominantly at Low risk.

B127F005-01 B215


© Copyright JBA Consulting – 2017 Groundwater Flood Risk Summary: The site is located within an area where between a 25% and 50% of the area is at risk of groundwater flooding. The majority of the site is located within a groundwater emergence zone. JBA groundwater mapping indicates groundwater depths of less than 0.5m in the extreme northern extent of the site with between 0.5m and 5m for the southern sections of the site.

B127F005-01 B216

Sewer Flooding Risk


Internal sewer flooding = 1‐5

External sewer flooding = 1‐5


Reservoir Failure Flooding Risk: The site is not within an area at risk of flooding as a result of reservoir failure. However, Queen Alexandra Road (immediately north of the northern site boundary) is at risk of flooding as a result of reservoir failure.

Staples Employment Site Flood Risk Recommendations



The opportunity to implement long‐term, catchment‐wide reductions in runoff through

B127F005-01 B217

SuDS and provision of surface water flood risk betterment to downstream properties by intercepting surface water flow paths through the site




Site Ref SHW0550

SFRA Ref 140

Site Name Sunnyside and St Johns House

Size (Ha) 0.086


No. Units 5

Fluvial Flood Risk


B127F005-01 B218


Surface Water Flood Risk Summary: The south‐western end of the site is designated as Medium risk of surface water flooding. The site‐specific FRA would need to consider:




of the development will not detrimentally affect third parties

B127F005-01 B219



Sewer Flooding Risk




B127F005-01 B220






The opportunity to implement surface water flood risk betterment to downstream properties by intercepting surface water flow paths through the site



B127F005-01 B221

Site Ref SHW0281

SFRA Ref 142

Site Name Edie Pusey House, 9A Amersham Road, High Wycombe

Size (Ha) 0.179


No. Units 5

Fluvial Flood Risk


B127F005-01 B222


Surface Water Flood Risk Summary: The entirety of the site and the adjacent highways are at Very Low to Low risk of flooding from surface water.

B127F005-01 B223



Sewer Flooding Risk




B127F005-01 B224




None

site ref shw0420 sfra ref 65 site name€¦ · sfra ref 71 site name delafield heights north,...

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