OR/14/001 What information does the dataset provide - Revision history

Ajhil: /* Data summary */

2021-10-19T09:29:38Z

Data summary

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	<center>		<center>
	{\| class="wikitable"		{\| class="wikitable"
	\|+ Table 9    Details of the original datasets used in the ''Corroded Asset Failure — Ferrous map''.		\|+ Table 9    Details of the original datasets used in the<br>''Corroded Asset Failure — Ferrous map''.

	\| Data layer		\| Data layer

Ajhil: /* Data summary */

2021-10-19T09:29:22Z

Data summary

← Older revision		Revision as of 10:29, 19 October 2021
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	The original datasets used in the creation of the ''Corroded Asset Failure — Ferrous ''map are detailed in Table 9.		The original datasets used in the creation of the ''Corroded Asset Failure — Ferrous ''map are detailed in Table 9.

			<center>
	{\| class="wikitable"		{\| class="wikitable"
	\|+ Table 9. Details of the original datasets used in the ''Corroded Asset Failure — Ferrous map''		\|+ Table 9    Details of the original datasets used in the ''Corroded Asset Failure — Ferrous map''.

	\| Data layer		\| Data layer
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	\| 1:50 000		\| 1:50 000
	\|}		\|}
			</center>

	==Reference==		==Reference==

Ajhil at 09:28, 19 October 2021

2021-10-19T09:28:17Z

← Older revision		Revision as of 10:28, 19 October 2021
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	{{OR/14/001}}		{{OR/14/001}}
	==Overview==		==Overview==
	This section describes the subsurface property datasets included in the ''Corroded Asset Failure — Ferrous''map.		This section describes the subsurface property datasets included in the ''Corroded Asset Failure — Ferrous'' map.

	===Summary map===		===Summary map===

Dbk at 14:51, 29 July 2015

2015-07-29T14:51:43Z

← Older revision		Revision as of 15:51, 29 July 2015
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	{{OR/14/001}}		{{OR/14/001}}
	==Overview==		==Overview==
	This section describes the subsurface property datasets included in the ''Corroded Asset Failure - Ferrous''map.		This section describes the subsurface property datasets included in the ''Corroded Asset Failure — Ferrous''map.

	===Summary map===		===Summary map===
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	* primary or secondary sulphides or sulphates are present		* primary or secondary sulphides or sulphates are present

	The corrosivity layer is based on the CIPRA ratings for assessing the corrosive properties of soils. It includes weighted scores for resistivity, soil alkalinity and acidity, moisture or the hydrological properties of parent materials, redox status, and the presence of sulphides/sulphates (Tye et al., 2011).		The corrosivity layer is based on the CIPRA ratings for assessing the corrosive properties of soils. It includes weighted scores for resistivity, soil alkalinity and acidity, moisture or the hydrological properties of parent materials, redox status, and the presence of sulphides/sulphates (Tye et al., 2011<ref name="Tye">Tye et al. 2011. User guide for the British Geological Survey Corrosivity (ferrous) dataset. ''British Geological Survey. Open Report'' OR/11/023 </ref>).

	This component data layer is derived from the BGS Corrosivity (ferrous) dataset. Information about the original dataset can be viewed at: [http://www.bgs.ac.uk/products/geohazards/corrosivity.html http://www.bgs.ac.uk/products/geohazards/corrosivity.html.]		This component data layer is derived from the BGS Corrosivity (ferrous) dataset. Information about the original dataset can be viewed at: [http://www.bgs.ac.uk/products/geohazards/corrosivity.html http://www.bgs.ac.uk/products/geohazards/corrosivity.html.]
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	This component data layer is derived from the soluble rocks layer of the BGS GeoSure dataset. This data layer has been reclassified to provide an indication of the potential for corroded ferrous assets to fail as a result of ground movement due to dissolution. Information about the original dataset can be viewed at: [http://www.bgs.ac.uk/products/geosure/soluble.html http://www.bgs.ac.uk/products/geosure/soluble.html.]		This component data layer is derived from the soluble rocks layer of the BGS GeoSure dataset. This data layer has been reclassified to provide an indication of the potential for corroded ferrous assets to fail as a result of ground movement due to dissolution. Information about the original dataset can be viewed at: [http://www.bgs.ac.uk/products/geosure/soluble.html http://www.bgs.ac.uk/products/geosure/soluble.html.]

	===Landslides===		===Landslides===
	A landslide is an outward and downward movement of material on a slope, due to the force of gravity. A slope is under stress from gravity but will not move if its strength is greater than this stress. If the balance is altered so that the stress exceeds the strength, then movement will occur. If movement does occur, underground assets could be damaged resulting in failure of that asset. If the underground asset in question is a pipe containing liquid, leakage could alter the strength of the deposit, leading to a more significant subsidence hazard.		A landslide is an outward and downward movement of material on a slope, due to the force of gravity. A slope is under stress from gravity but will not move if its strength is greater than this stress. If the balance is altered so that the stress exceeds the strength, then movement will occur. If movement does occur, underground assets could be damaged resulting in failure of that asset. If the underground asset in question is a pipe containing liquid, leakage could alter the strength of the deposit, leading to a more significant subsidence hazard.
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	==Data summary==		==Data summary==
	The original datasets used in the creation of the ''Corroded Asset Failure - Ferrous ''map are detailed in Table 9.		The original datasets used in the creation of the ''Corroded Asset Failure — Ferrous ''map are detailed in Table 9.

	{\| class="wikitable"		{\| class="wikitable"
	\|+ Table 9. Details of the original datasets used in the ''Corroded Asset Failure - Ferrous ''map''		\|+ Table 9. Details of the original datasets used in the ''Corroded Asset Failure — Ferrous map''

	\| Data layer		\| Data layer
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	\| 1:50 000		\| 1:50 000
	\|}		\|}

			==Reference==



	[[category: OR/14/001 User Guide for the Corroded Asset Failure – Ferrous map \| 05]]		[[category: OR/14/001 User Guide for the Corroded Asset Failure – Ferrous map \| 05]]

Dbk: Protected "OR/14/001 What information does the dataset provide" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite)) [cascading]

2015-05-13T08:35:15Z

Protected "OR/14/001 What information does the dataset provide" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite)) [cascading]

← Older revision	Revision as of 09:35, 13 May 2015
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Dbk: /* Collapsible ground */

2015-05-13T08:34:46Z

Collapsible ground

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	===Collapsible ground===		===Collapsible ground===
	Collapsible ground comprises certain fine-grained materials with large pore spaces. Such deposits can collapse when they have been loaded and then become saturated by water. If the ground below a building collapses it may cause the building to sink. If the collapsible ground is variable in thickness or distribution, structures may suffer from distortion, tilting or cracking. Underground assets may be affected by such movement, particularly where corroded. If the underground asset in question is a pipeline that leaks, the additional water may accentuate the ground stability issue resulting in more widespread breakages.		Collapsible ground comprises certain fine-grained materials with large pore spaces. Such deposits can collapse when they have been loaded and then become saturated by water. If the ground below a building collapses it may cause the building to sink. If the collapsible ground is variable in thickness or distribution, structures may suffer from distortion, tilting or cracking. Underground assets may be affected by such movement, particularly where corroded. If the underground asset in question is a pipeline that leaks, the additional water may accentuate the ground stability issue resulting in more widespread breakages.

	This component data layer is derived from the collapsible ground layer in the BGS GeoSure dataset. This data layer has been reclassified to provide an indication of the potential for corroded ferrous assets to fail as a result of ground movement due to collapsible ground. Information about the original dataset can be viewed at: [http://www.bgs.ac.uk/products/geosure/collapsible.html http://www.bgs.ac.uk/products/geosure/collapsible.html.]		This component data layer is derived from the collapsible ground layer in the BGS GeoSure dataset. This data layer has been reclassified to provide an indication of the potential for corroded ferrous assets to fail as a result of ground movement due to collapsible ground. Information about the original dataset can be viewed at: [http://www.bgs.ac.uk/products/geosure/collapsible.html http://www.bgs.ac.uk/products/geosure/collapsible.html.]

Dbk: Created page with "notoc {{OR/14/001}} ==Overview== This section describes the subsurface property datasets included in the ''Corroded Asset Failure - Ferrous''map. ===Summary map=== The su..."

2015-05-13T08:34:34Z

Created page with "__notoc__ {{OR/14/001}} ==Overview== This section describes the subsurface property datasets included in the ''Corroded Asset Failure - Ferrous''map. ===Summary map=== The su..."

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__notoc__
{{OR/14/001}}
==Overview==
This section describes the subsurface property datasets included in the ''Corroded Asset Failure - Ferrous''map.

===Summary map===
The summary layer provides an overview of the susceptibility of corroded ferrous assets to fail due to ground movement. It is derived from the datasets described in Sections Corrosivity to Collapsible ground.

===Corrosivity===
The aggressiveness of the soil to ferrous assets depends on the soil characteristics. Corrosion is more likely to occur where some or all of the following conditions coexist:
* drainage is poor;
* low resistivity;
* pH is either low or high, and
* primary or secondary sulphides or sulphates are present

The corrosivity layer is based on the CIPRA ratings for assessing the corrosive properties of soils. It includes weighted scores for resistivity, soil alkalinity and acidity, moisture or the hydrological properties of parent materials, redox status, and the presence of sulphides/sulphates (Tye et al., 2011).

This component data layer is derived from the BGS Corrosivity (ferrous) dataset. Information about the original dataset can be viewed at: [http://www.bgs.ac.uk/products/geohazards/corrosivity.html http://www.bgs.ac.uk/products/geohazards/corrosivity.html.]

===Soluble rocks===
Some types of ground contain layers of material that can dissolve in underground water. This can cause underground cavities to develop. The ground above cavities can collapse, resulting in subsidence. More commonly, changes in ground or surface water flow can flush away unconsolidated sediment, potentially leading to the collapse of overlying materials also leading to subsidence at the surface. If such subsidence occurs, the ground around underground assets can move causing corroded assets to fail. If the underground asset in question is a pipe containing liquid, leaking water can increase dissolution or flushing of unconsolidated sediments, leading to a potentially more significant hazard.

This component data layer is derived from the soluble rocks layer of the BGS GeoSure dataset. This data layer has been reclassified to provide an indication of the potential for corroded ferrous assets to fail as a result of ground movement due to dissolution. Information about the original dataset can be viewed at: [http://www.bgs.ac.uk/products/geosure/soluble.html http://www.bgs.ac.uk/products/geosure/soluble.html.]
===Landslides===
A landslide is an outward and downward movement of material on a slope, due to the force of gravity. A slope is under stress from gravity but will not move if its strength is greater than this stress. If the balance is altered so that the stress exceeds the strength, then movement will occur. If movement does occur, underground assets could be damaged resulting in failure of that asset. If the underground asset in question is a pipe containing liquid, leakage could alter the strength of the deposit, leading to a more significant subsidence hazard.

This component data layer is derived from the landslide layer of the BGS GeoSure dataset. This data layer has been reclassified to provide an indication of the potential for corroded ferrous assets to fail as a result of ground movement due to landslide. Information about the original dataset can be viewed at: [http://www.bgs.ac.uk/products/geosure/landslides.html http://www.bgs.ac.uk/products/geosure/landslides.html.]

Landslide hazards present along the coastline may be under-represented in this dataset due to inaccuracies in the digital elevation model along the coastline.

===Compressible ground===
Many geological deposits contain water-filled pores. When the ground is compressed by a building or other load, the water in the pore space can be squeezed out, causing the ground to compress. This may cause uniform or non-uniform settling, resulting in tilting, cracking or distortion of underground assets, particularly if they are corroded. If the underground asset in question is a pipe containing liquid, leakage could alter the strength of the deposit, leading to more significant ground movement.

This component data layer is derived from the compressible ground layer of the BGS GeoSure dataset. This data layer has been reclassified to provide an indication of the potential for corroded ferrous assets to fail as a result of ground movement due to compressibility. Information about the original dataset can be viewed at: [http://www.bgs.ac.uk/products/geosure/compressible.html http://www.bgs.ac.uk/products/geosure/compressible.html.]

===Swelling clays===
Clays that are susceptible to shrink and swell, change volume significantly according to how much water they contain. All clay deposits change volume as their water content varies, typically swelling in winter and shrinking in summer, but some do so to a greater extent than others. Contributory circumstances include the change in moisture content brought about by drought, leaking pipes, tree roots drying out the ground, or changes to local drainage patterns, such as the creation of soakaways. Shrinkage may remove the support from underground assets such as pipes or foundations, whereas clay expansion may lead to uplift or lateral stress on part or all of an asset; any such movement may cause cracking and distortion. If the asset in question is a pipe that leaks, the water added to the ground may cause additional swelling, possibly causing further differential uplift.

This component data layer is derived from the shrink-swell layer of the BGS GeoSure dataset. This data layer has been reclassified to provide an indication of the potential for corroded ferrous assets to fail as a result of ground movement due to swelling clay. Information about the original dataset can be viewed at: [http://www.bgs.ac.uk/products/geosure/shrink_swell.html http://www.bgs.ac.uk/products/geosure/shrink_swell.html.]

===Running sands===
Running sand conditions occur when loosely-packed sand, saturated with water, flows into an excavation or other type of void. The pressure of the water filling the spaces between the sand grains reduces the contact between the grains causing them to be carried along by the flow. This can lead to subsidence of the surrounding ground. Running sand can result in ground instability for underground assets in two ways; first, sand may run into a void removing the support from beneath an underground asset and secondly if a failed pipeline asset is leaking, the flow of water may cause sands to flow, thereby resulting in subsidence of surrounding ground.

This component data layer is derived from the running sand layer of the BGS GeoSure dataset. This data layer has been reclassified to provide an indication of the potential for corroded ferrous assets to fail as a result of ground movement due to running sand. Information about the original dataset can be viewed at: [http://www.bgs.ac.uk/products/geosure/running_sand.html http://www.bgs.ac.uk/products/geosure/running_sand.html.]

===Collapsible ground===
Collapsible ground comprises certain fine-grained materials with large pore spaces. Such deposits can collapse when they have been loaded and then become saturated by water. If the ground below a building collapses it may cause the building to sink. If the collapsible ground is variable in thickness or distribution, structures may suffer from distortion, tilting or cracking. Underground assets may be affected by such movement, particularly where corroded. If the underground asset in question is a pipeline that leaks, the additional water may accentuate the ground stability issue resulting in more widespread breakages.
This component data layer is derived from the collapsible ground layer in the BGS GeoSure dataset. This data layer has been reclassified to provide an indication of the potential for corroded ferrous assets to fail as a result of ground movement due to collapsible ground. Information about the original dataset can be viewed at: [http://www.bgs.ac.uk/products/geosure/collapsible.html http://www.bgs.ac.uk/products/geosure/collapsible.html.]

==Data summary==
The original datasets used in the creation of the ''Corroded Asset Failure - Ferrous ''map are detailed in Table 9.

{| class="wikitable"
|+ Table 9. Details of the original datasets used in the ''Corroded Asset Failure - Ferrous ''map''

| Data layer
| Layer ID
| Original dataset
| Dataset owner
| Scale
|-
| Summary
| Summary
| N/A
| BGS
| 1:50 000
|-
| Corrosivity
| Corrosiv
| Corrosivity v1
| BGS
| 1:50 000
|-
| Soluble rocks
| Soluble
| GeoSure v6
| BGS
| 1:50 000
|-
| Landslides
| Lndslides
| GeoSure v6
| BGS
| 1:50 000
|-
| Compressible ground
| Compress
| GeoSure v6
| BGS
| 1:50 000
|-
| Swelling clay
| Swell
| GeoSure v6
| BGS
| 1:50 000
|-
| Running sand
| Runsand
| GeoSure v6
| BGS
| 1:50 000
|-
| Collapsible ground
| Collapse
| GeoSure v6
| BGS
| 1:50 000
|}

[[category: OR/14/001 User Guide for the Corroded Asset Failure – Ferrous map | 05]]

OR/14/001 What information does the dataset provide - Revision history

Ajhil: /* Data summary */

Ajhil: /* Data summary */

Ajhil at 09:28, 19 October 2021

Dbk at 14:51, 29 July 2015

Dbk: Protected "OR/14/001 What information does the dataset provide" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite)) [cascading]

Dbk: /* Collapsible ground */

Dbk: Created page with "__notoc__ {{OR/14/001}} ==Overview== This section describes the subsurface property datasets included in the ''Corroded Asset Failure - Ferrous''map. ===Summary map=== The su..."

Dbk: Created page with "notoc {{OR/14/001}} ==Overview== This section describes the subsurface property datasets included in the ''Corroded Asset Failure - Ferrous''map. ===Summary map=== The su..."