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Mawgan Porth Coastal Change Study Report| C Jones Enterprise Ltd Ordnance Survey Plan Published 1974 Source map scale - 1:10,000 The historical maps shown were reproduced from maps predominantly held at the scale adopted for England, Wales and Scotland in the 1840`s. In 1854 the 1:2,500 scale was adopted for mapping urban areas; these maps were used to update the 1:10,560 maps. The published date given therefore is often some years later than the surveyed date. Before 1938, all OS maps were based on the Cassini Projection, with independent surveys of a single county or group of counties, giving rise to significant inaccuracies in outlying areas. In the late 1940`s, a Provisional Edition was produced, which updated the 1:10,560 mapping from a number of sources. The maps appear unfinished - with all military camps and other strategic sites removed. These maps were initially overprinted with the National Grid. In 1970, the first 1:10,000 maps were produced using the Transverse Mercator Projection. The revision process continued until recently, with new editions appearing every 10 years or so for urban areas. Map Name(s) and Date(s) Historical Map - Slice A Order Details Order Number: 273490903_1_1 Customer Ref: 17682-GSWP National Grid Reference: 185020, 67190 Slice: A Site Area (Ha): 0.26 Search Buffer (m): 1000 Site Details Site at, Mawgan Porth, Cornwall Tel: 0844 844 9952 Fax: 0844 844 9951 Web: www.envirocheck.co.uk A Landmark Information Group Service v50.0 16-Feb-2021 Page 5 of 9 Ordnance Survey Plan Published 1983 Source map scale - 1:10,000 The historical maps shown were reproduced from maps predominantly held at the scale adopted for England, Wales and Scotland in the 1840`s. In 1854 the 1:2,500 scale was adopted for mapping urban areas; these maps were used to update the 1:10,560 maps. The published date given therefore is often some years later than the surveyed date. Before 1938, all OS maps were based on the Cassini Projection, with independent surveys of a single county or group of counties, giving rise to significant inaccuracies in outlying areas. In the late 1940`s, a Provisional Edition was produced, which updated the 1:10,560 mapping from a number of sources. The maps appear unfinished - with all military camps and other strategic sites removed. These maps were initially overprinted with the National Grid. In 1970, the first 1:10,000 maps were produced using the Transverse Mercator Projection. The revision process continued until recently, with new editions appearing every 10 years or so for urban areas. Map Name(s) and Date(s) Historical Map - Slice A Order Details Order Number: 273490903_1_1 Customer Ref: 17682-GSWP National Grid Reference: 185020, 67190 Slice: A Site Area (Ha): 0.26 Search Buffer (m): 1000 Site Details Site at, Mawgan Porth, Cornwall Tel: 0844 844 9952 Fax: 0844 844 9951 Web: www.envirocheck.co.uk A Landmark Information Group Service v50.0 16-Feb-2021 Page 6 of 9 10k Raster Mapping Published 2000 Source map scale - 1:10,000 The historical maps shown were produced from the Ordnance Survey`s 1:10,000 colour raster mapping. These maps are derived from Landplan which replaced the old 1:10,000 maps originally published in 1970. The data is highly detailed showing buildings, fences and field boundaries as well as all roads, tracks and paths. Road names are also included together with the relevant road number and classification. Boundary information depiction includes county, unitary authority, district, civil parish and constituency. Map Name(s) and Date(s) Historical Map - Slice A Order Details Order Number: 273490903_1_1 Customer Ref: 17682-GSWP National Grid Reference: 185020, 67190 Slice: A Site Area (Ha): 0.26 Search Buffer (m): 1000 Site Details Site at, Mawgan Porth, Cornwall Tel: 0844 844 9952 Fax: 0844 844 9951 Web: www.envirocheck.co.uk A Landmark Information Group Service v50.0 16-Feb-2021 Page 7 of 9 10k Raster Mapping Published 2006 Source map scale - 1:10,000 The historical maps shown were produced from the Ordnance Survey`s 1:10,000 colour raster mapping. These maps are derived from Landplan which replaced the old 1:10,000 maps originally published in 1970. The data is highly detailed showing buildings, fences and field boundaries as well as all roads, tracks and paths. Road names are also included together with the relevant road number and classification. Boundary information depiction includes county, unitary authority, district, civil parish and constituency. dummy Map Name(s) and Date(s) Historical Map - Slice A Order Details Order Number: 273490903_1_1 Customer Ref: 17682-GSWP National Grid Reference: 185020, 67190 Slice: A Site Area (Ha): 0.26 Search Buffer (m): 1000 Site Details Site at, Mawgan Porth, Cornwall Tel: 0844 844 9952 Fax: 0844 844 9951 Web: www.envirocheck.co.uk A Landmark Information Group Service v50.0 16-Feb-2021 Page 8 of 9 VectorMap Local Published 2020 Source map scale - 1:10,000 VectorMap Local (Raster) is Ordnance Survey's highest detailed 'backdrop' mapping product. These maps are produced from OS's VectorMap Local, a simple vector dataset at a nominal scale of 1:10,000, covering the whole of Great Britain, that has been designed for creating graphical mapping. OS VectorMap Local is derived from large-scale information surveyed at 1:1250 scale (covering major towns and cities),1:2500 scale (smaller towns, villages and developed rural areas), and 1:10 000 scale (mountain, moorland and river estuary areas). Map Name(s) and Date(s) Historical Map - Slice A Order Details Order Number: 273490903_1_1 Customer Ref: 17682-GSWP National Grid Reference: 185020, 67190 Slice: A Site Area (Ha): 0.26 Search Buffer (m): 1000 Site Details Site at, Mawgan Porth, Cornwall Tel: 0844 844 9952 Fax: 0844 844 9951 Web: www.envirocheck.co.uk A Landmark Information Group Service v50.0 16-Feb-2021 Page 9 of 9 Appendix D Relevant Extracts from SMP2 Mawgan Porth Coastal Change Study Report| C Jones Enterprise Ltd. | Coastal Change Study Report | 17682-HYD-XX-XX-RP-GE-1001 | 5 March 2021 Location reference: Trevelgue Head to Stepper Point Management Area reference: MA33 Policy Development Zone: PDZ13 Cornwall and Isles of Scilly SMP2 Final Report Chapter 4 PDZ13 11 February 2011 DISCUSSION AND DETAILED POLICY DEVELOPMENT Along the undefended cliffs and coves a no active intervention policy should meet the high level SMP objectives and support AONB and heritage coast designations. There are two notable features along the undefended coast covered under this policy unit, namely Trevelgue Cliff Castle at Trevelgue Head and Bedruthan Steps, just north of Mawgan Porth. Trevelgue Cliff Castle is an important pre-historic settlement site (see inset map, right) and there have been some erosion concerns for this feature prior to the SMP review. The erosion mapping does not indicate that extensive risk from erosion is anticipated for the feature, but that does not discount the fact that isolated, discrete cliff falls may affect the site in the future, as they are a feature of this section of cliffed coastline. Bedruthan Steps are a geological feature of the coastline (although Redcliff Cliff Castle is also present at the site). The Steps are a popular visitor attraction throughout the year (owned and managed by the National Trust). Bedruthan Steps Although erosion risk per se is low, there are likely to be impacts on the foreshore Steps features, due to rising sea levels causing greater depth and wave height closer to the base of the cliffs. Although these natural risks are identified for both features, no active intervention is still considered the suitable policy choice through all three epochs. There is a possibility of some cliff recession adjacent to Hotel and Car Park at Watergate Bay. Although the geology is generally hard and resistant along this stretch of coastline, there are relatively frequent examples of cliff falls at discrete locations throughout the Bay from Trevelgue Head, Whipsiderry Beach, Watergate Beach and through to Beryl’s Point. Very limited assets are thought to be at risk (see inset map right) but the no active intervention approach should not preclude the privately funded maintenance of the short section of defences (recently upgraded/improved) which are Watergate present adjacent to the access point Bay onto Watergate Beach. The importance of these to the local economy is recognised. Studies (Haskoning, 2009) have concluded that they would not be detrimental to the wider beach and cliff processes given their relative insignificant length within the Cornwall and Isles of Scilly SMP2 Final Report Chapter 4 PDZ13 12 February 2011 overall extensive Watergate Bay frontage. Flood inundation is not an issue at Watergate due to the steeply rising topography. At Mawgan Porth, erosion and flooding risk place significant future pressure on the frontage and as such drive the preferred plan and policy. Erosion extent by 2105 could be as much as 35-40 metres and flood extents will increase up to the normal tidal limit of the River Menalhyl which discharges onto Mawgan Porth beach (see inset map, left). Assets at the rear of the beach are presently already subject to high flood risk due to wave overtopping action and this will only increase into the future. The B3276 road is a local through route, but it also is vulnerable. Given the present days risks, it is prudent that the preferred plan looks to initiate a managed realignment approach from epoch 1 onwards. The coastal changes will therefore be significant to this community, requiring re-routing of the B3276, and possible relocation of the commercial hub of the community. As such Land Use Planners should consider identifying this as a Coastal Change Management Area.
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