River Kelvin Flood Protection Scheme

Client: East Dunbartonshire Council

Following extensive investigations into serious flooding on the River Kelvin and its tributaries, and additional feasibility works, East Dunbartonshire Council sought assistance to design and construct 19 flood defence schemes to alleviate flooding up to the 1 in 100 year return probability event. Alongside Byzak Contractors, Entec was appointed to fully design two of the schemes, with the other 17 being taken to outline design.

Our multi-disciplinary skills and track record in water related projects, allowed us to undertake comprehensive detail design to:

• prevent the ingress of floodwaters from the River Kelvin and its tributaries: overland, through pipes, ducts, drains, sewers and culverts crossing the defence line and seepage through permeable ground strata below and/or around the defences;
• ensure the works could resist full hydrostatic loading to the top of the defences for a minimum duration of 72 hours and remain stable and erosion free when overtopped to a depth of 100mm;
• ensure the embankments remained stable and erosion free during rapid draw down of the flood waters;
• prevent secondary flooding from surface water drains during times when the gravity drainage to the watercourse is not possible due to high river levels; and
• ensure the works are capable of being raised by 500 mm in the future without altering the substructure.

Climate Change - Flood Occurrence Review

Client: Scottish Executive

Climate change predictions suggest that the threat of inland and coastal flooding will increase and cause greater associated impacts upon Scotland's economy and society. In this context, Entec and the University of Dundee were appointed by the Scottish Executive to undertake a wide ranging review of the magnitude and location of flooding across Scotland. The study consisted of a literature review, new runoff modelling based on climate change scenarios, flood trend analysis; GIS based analysis of flood risk data for Scotland; estimate of economic losses using GIS; public awareness assessments and expert consultation. In addition to a range of findings identifying increased risk, such as an expected increase in 'flood rich' periods, increased risk of flooding in parts of the Scottish coast, an increase in inland flooding, significant rises in sea levels and damage to properties, the study identified a range of recommendations to improve the scientific understanding of inland and coastal floods and find better ways of identifying and managing flood risks. Many of the study's recommendations are also assisting in the planning of future research to mitigate flooding risk across Scotland.

Bog Burn Flood Prevention Scheme assessment

Client: West Lothian Council

Entec was commissioned by West Lothian Council (WLC) to assess the flood risk associated with the Bathgate Water catchment, including an assessment of the Bog Burn Flood Prevention Scheme (FPS). WLC had concerns regarding a proposed development which is on areas adjacent to the FPS and also proposals from the developers to integrate the site drainage and SuDS with the FPS. A summary of the work is given below.

• Re-assess the Bathgate Water catchment model, and specifically the detail of the Bog Burn FPS, to determine the suitability of the model for undertaking this review;
• Determine the existing performance of the FPS to use as a baseline to measure any effects of the development;
• Revision of the model to include additional runoff, and alterations to the available storage areas as a result of the proposed development;
• Determine the localised effects of the development and also any wider effects that may result downstream of the site;
• Provide confirmation to the client that if the recommendations on storage and maintaining greenfield runoff rates are adhered to then the development was not at risk from flooding and would not cause an increase in flood risk.