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Infrastructure Delivery Plan (Feb 2013) - Runnymede Borough Council

Infrastructure Delivery Plan (Feb 2013) - Runnymede Borough Council

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Table 15 - Summary of flood risks in <strong>Runnymede</strong><br />

Source of<br />

flooding<br />

Fluvial<br />

Fluvial<br />

Pathway Area at Risk/Receptor Risk<br />

Out of bank flow from the<br />

Thames, Wey, Addlestone<br />

Bourne and Chertsey<br />

Bourne<br />

Backing up of water in the<br />

Chertsey Bourne and<br />

other tributaries from high<br />

levels in the Thames<br />

Out of bank flow from<br />

Chertsey Bourne<br />

Backing up of water in the<br />

Chertsey Bourne from<br />

Egham, Egham Hythe,<br />

Chertsey and Addlestone<br />

within the floodplain of the<br />

Lower Thames and<br />

Chertsey Bourne<br />

Thorpe and Thorpe Green<br />

in the floodplain of the<br />

Chertsey Bourne<br />

high levels in the Thames<br />

Groundwater Rising groundwater levels Low lying areas in the<br />

Thames floodplain and in<br />

areas of alluvial sands and<br />

gravels<br />

Surface<br />

Water<br />

Local <strong>Plan</strong><br />

Sewer<br />

capacity<br />

Impounded<br />

waters<br />

Surcharging of drains or<br />

culverted watercourses<br />

Surcharging of sewers<br />

Breach of raised canal or<br />

cascade on reservoir<br />

Areas of Egham and<br />

Woodham that have<br />

experienced previous<br />

surface runoff flooding<br />

Areas within low lying<br />

floodplain with naturally wet<br />

soils<br />

Potential for sewer capacity<br />

problems in Egham and<br />

Chertsey<br />

Residual risk downstream<br />

of Virginia Water lake in<br />

Virginia Water and<br />

Chertsey<br />

Residual risk in Woodham<br />

from the Basingstoke Canal<br />

Very high<br />

High<br />

Medium<br />

Low<br />

Low<br />

Negligible<br />

Tidal None None in <strong>Runnymede</strong> None<br />

Source: <strong>Runnymede</strong> Strategic Flood Risk Assessment (SFRA), May 2009<br />

13.53 The location policies in the Local <strong>Plan</strong>; LP01-LP08, are considered to be most relevant<br />

in this case. These policies confirm where new development is expected in the<br />

<strong>Borough</strong> over the plan period. The <strong>Council</strong>’s preferred approach is that in the<br />

<strong>Borough</strong>’s Urban Areas, development would be focussed in areas with the lowest risk<br />

of flooding. Development will also take place at the former DERA site in Longcross<br />

which is in the Green Belt but in flood zone 1.<br />

13.54 Strategic policy 10 (SP10) is also considered to be materially relevant as it is<br />

concerned with development and flood risk. This policy recognises the severity of the<br />

flooding risk and lack of formal flood defences within the <strong>Borough</strong>.<br />

Future provision<br />

13.55 The Lower Thames Flood Risk Management Strategy (LTFRMS) which went out to<br />

public consultation in 2009, has the key objective of identifying sustainable solutions to<br />

reduce flood risk to people and property. This strategy presents a long term programme<br />

Page | 139<br />

<strong>Runnymede</strong> IDP DRAFT – <strong>Feb</strong>ruary <strong>2013</strong>

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