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DRAFT Sustainability Appraisal Report for the Emerging Local Plan ...

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

8.11 Strategic Flood Risk Assessment (2009)<br />

This document provides an assessment of flood risks associated with areas considered <strong>for</strong><br />

future development.<br />

Current Baseline Condition<br />

8.12 The SEA Directive and UK SEA Regulations require that an account be given of <strong>the</strong> current and<br />

likely future composition and condition of <strong>the</strong> environment in <strong>the</strong> area covered by <strong>the</strong><br />

proposed plan. The environmental baseline presented in this section has been compiled from<br />

available sources of primary and secondary data that in <strong>the</strong> main relate to RSF Indicators that<br />

have been monitored by <strong>the</strong> Council in one <strong>for</strong>m or ano<strong>the</strong>r since 2004.<br />

8.13 Runnymede is located with <strong>the</strong> Thames Watershed (River Basin) (see. Figure 9). Covering an<br />

area of some 16,133 square kilometres and encompasses <strong>the</strong> River Thames and its tributaries<br />

from its source in Gloucestershire through Runnymede to London and eventually to <strong>the</strong> North<br />

Sea.<br />

Flood Management<br />

8.14 In Runnymede trend data suggests that <strong>the</strong>re are increased levels of commercial and<br />

residential properties at risk of flooding. Current data shows that in October 2011<br />

Runnymede reported 21,633 combined commercial and residential properties at risk of<br />

flooding.<br />

Water Quality<br />

8.15 The River Thames <strong>for</strong>ms <strong>the</strong> north and eastern boundary of <strong>the</strong> borough, with <strong>the</strong> sou<strong>the</strong>astern<br />

boundary being <strong>for</strong>med by <strong>the</strong> River Wey (tributary of <strong>the</strong> Thames). The River<br />

Figure 9 – Thames Watershed (River Basin)<br />

Bourne, a small river having its source in Windsor Great Park, runs through Wentworth,<br />

Thorpe, Chertsey and Addlestone Bourne areas within <strong>the</strong> Wey catchment.<br />

8.16 The rivers in Runnymede are generally of good or very good quality (42) in terms of <strong>the</strong>ir<br />

chemical and biological standards, however <strong>the</strong>ir nutrient levels remain high.<br />

42 Environment Agency ‐ 2009 River Quality data.<br />

Page | 111 Runnymede BC FINAL <strong>Sustainability</strong> <strong>Appraisal</strong> <strong>Report</strong> – Feb 2013

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