Appendix 8.1 Flood Risk Assessment - Peel

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Peel Environmental Ltd Flood Risk Assessment – South Clyde Energy Centre, Glasgow The British Geological Society Groundwater Flooding Hazard Maps indicate that Glasgow is situated within an area with very low to low groundwater vulnerability. Glasgow CC have not provided 9 any information on groundwater flooding. Groundwater flooding is therefore not considered to be a significant source of flood risk to the site. 3.4 SURFACE WATER FLOODING Surface water flooding comprises pluvial flooding, sewer flooding and flooding from highway drains and gullies. 3.4.1 Pluvial Flooding Pluvial flooding results from rainfall-generated overland flow, before the runoff enters any watercourse or sewer, or where the sewerage/drainage systems and watercourses are overwhelmed and therefore unable to accept surface water. Pluvial flooding is usually associated with high intensity rainfall events but may also occur with lower intensity rainfall where the ground is saturated, developed or otherwise has low permeability resulting in overland flow and ponding within depressions in the topography. Glasgow CC have not identified any problems with pluvial flooding at the site. Any issues with regard to surface water flooding will be addressed through the surface water drainage scheme as outlined in the Drainage Impact Assessment. 3.4.2 Sewer Flooding Sewer flooding occurs when the sewerage infrastructure has to deal with flow rates beyond its design capacity. This occurs most often as a result of high intensity rainfall events and, as detailed in paragraph 16 of PAN69, is exacerbated by the fact that the sewage infrastructure in many parts of Scotland constitutes an old combined system, taking both foul sewerage and surface water. Scottish Water have not indicated any records of historical sewer flooding within this area. Scottish Planning Policy and PAN69 encourage new developments to separate surface and foul water discharges to reduce the volume of water entering the public sewer system. Scottish Planning Policy promotes the use of Sustainable Drainage Systems (SUDS) to address surface water drainage. SUDS are designed to manage the flow of surface water which could otherwise find its way into the public sewer network or receiving watercourse. By reducing the volume of surface water in a sewer, SUDS will subsequently reduce the likelihood of sewer or watercourse flooding. This is considered in further detail in the Drainage Impact Assessment with respect to the proposed development site. 9 Email from John Lowe (Glasgow City Council) to Sarah Cowie (Weetwood) dated 15 December 2010 ©Weetwood www.weetwood.net 10 1727 SCEC/FRA_Final v2.1 14 May 2012
Peel Environmental Ltd Flood Risk Assessment – South Clyde Energy Centre, Glasgow 3.5 ACCESS AND EGRESS Access to the site will be provided via Bogmoor Road to the north. Bogmoor Road lies outside any areas at risk of flooding from the River Clyde. It is considered unlikely that the unnamed watercourse to the west of the site would flood the area of Bogmoor Road to the extent and depths required to preclude access of egress for the site. Safe access and egress from the site may therefore be provided via Bogmoor Road. ©Weetwood www.weetwood.net 11 1727 SCEC/FRA_Final v2.1 14 May 2012
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Appendix 8.1 Flood Risk Assessment - Peel

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