OR/15/016 Summary - Revision history

Dbk at 14:28, 27 July 2015

2015-07-27T14:28:10Z

← Older revision		Revision as of 15:28, 27 July 2015
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	In the wake of widespread groundwater flooding that affected properties and infrastructure in southern England during 2014, a review has been undertaken of the number of properties in England that might be vulnerable during episodes of high groundwater levels, and an estimate made of how many properties might be affected in susceptible areas.		In the wake of widespread groundwater flooding that affected properties and infrastructure in southern England during 2014, a review has been undertaken of the number of properties in England that might be vulnerable during episodes of high groundwater levels, and an estimate made of how many properties might be affected in susceptible areas.

	Groundwater flooding can happen in many geological environments, but is a particular problem on Chalk and Limestone aquifers, where around 920,000 properties are in areas where groundwater emergence could occur. This represents fewer properties than previously estimated for these areas. However, a further 3,800,000 properties are in areas underlain by other aquifer types that could be affected by groundwater flooding or shallow water tables.		Groundwater flooding can happen in many geological environments, but is a particular problem on Chalk and Limestone aquifers, where around 920 000 properties are in areas where groundwater emergence could occur. This represents fewer properties than previously estimated for these areas. However, a further 3,800,000 properties are in areas underlain by other aquifer types that could be affected by groundwater flooding or shallow water tables.

	The actual impact of groundwater flooding on properties is often mitigated by building design or natural/artificial drainage systems which act to lower water tables and move emergent water to rivers. As a result only a small percentage of properties identified above are likely to be impacted by groundwater flooding. Although there is limited observational data, we believe that up to 138,000 properties might be impacted in chalk and limestone areas and up to 151,600 in other areas.		The actual impact of groundwater flooding on properties is often mitigated by building design or natural/artificial drainage systems which act to lower water tables and move emergent water to rivers. As a result only a small percentage of properties identified above are likely to be impacted by groundwater flooding. Although there is limited observational data, we believe that up to 138 000 properties might be impacted in chalk and limestone areas and up to 151 600 in other areas.

	This means the revised estimate of the number of properties in areas at risk of groundwater flooding is between 122,000 and 290,000.		This means the revised estimate of the number of properties in areas at risk of groundwater flooding is between 122 000 and 290 000.

	Groundwater may play a role in the flooding of a further 980,000 properties in areas that are also at risk from river and/or coastal flooding. In addition, groundwater flooding is a significant issue for subsurface infrastructure. Note that this latter issue has not been assessed in this report.		Groundwater may play a role in the flooding of a further 980 000 properties in areas that are also at risk from river and/or coastal flooding. In addition, groundwater flooding is a significant issue for subsurface infrastructure. Note that this latter issue has not been assessed in this report.

	[[category: OR/15/016 Estimating numbers of properties susceptible to groundwater flooding in England \| 01]]		[[category: OR/15/016 Estimating numbers of properties susceptible to groundwater flooding in England \| 01]]

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2015-06-12T09:16:45Z

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Dbk: Created page with "notoc {{OR/15/016}} In the wake of widespread groundwater flooding that affected properties and infrastructure in southern England during 2014, a review has been undertake..."

2015-05-11T09:14:42Z

Created page with "__notoc__ {{OR/15/016}} In the wake of widespread groundwater flooding that affected properties and infrastructure in southern England during 2014, a review has been undertake..."

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{{OR/15/016}}
In the wake of widespread groundwater flooding that affected properties and infrastructure in southern England during 2014, a review has been undertaken of the number of properties in England that might be vulnerable during episodes of high groundwater levels, and an estimate made of how many properties might be affected in susceptible areas.

Groundwater flooding can happen in many geological environments, but is a particular problem on Chalk and Limestone aquifers, where around 920,000 properties are in areas where groundwater emergence could occur. This represents fewer properties than previously estimated for these areas. However, a further 3,800,000 properties are in areas underlain by other aquifer types that could be affected by groundwater flooding or shallow water tables.

The actual impact of groundwater flooding on properties is often mitigated by building design or natural/artificial drainage systems which act to lower water tables and move emergent water to rivers. As a result only a small percentage of properties identified above are likely to be impacted by groundwater flooding. Although there is limited observational data, we believe that up to 138,000 properties might be impacted in chalk and limestone areas and up to 151,600 in other areas.

This means the revised estimate of the number of properties in areas at risk of groundwater flooding is between 122,000 and 290,000.

Groundwater may play a role in the flooding of a further 980,000 properties in areas that are also at risk from river and/or coastal flooding. In addition, groundwater flooding is a significant issue for subsurface infrastructure. Note that this latter issue has not been assessed in this report.

[[category: OR/15/016 Estimating numbers of properties susceptible to groundwater flooding in England | 01]]

OR/15/016 Summary - Revision history

Dbk at 14:28, 27 July 2015

Dbk: Protected "OR/15/016 Summary" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite)) [cascading]

Dbk: Created page with "__notoc__ {{OR/15/016}} In the wake of widespread groundwater flooding that affected properties and infrastructure in southern England during 2014, a review has been undertake..."

Dbk: Created page with "notoc {{OR/15/016}} In the wake of widespread groundwater flooding that affected properties and infrastructure in southern England during 2014, a review has been undertake..."