This study was undertaken for a UK water and sewerage company and comprised a hierarchical survey to identify the area of activity which represented the highest risk to the company as a whole. The project involved both questionnaires and interviews. The results of the first stage identified the functional area of primary concern. Stage 2 examined this area in more detail and compared the survey results with recent July Return data.
A risk-based methodology to assess the serviceability of above and below ground assets was developed for one of the largest UK water and sewerage companies. Serviceability included compliance with all relevant regulations and guidelines, e.g. DWI, H&S, MAFF & EA.
The underground method was based on hierarchical dependency trees for both the tendency of an asset to fail and the consequences of failure. The input data were obtained from a corporate asset information database, surveys and other external sources of information relating to each area.
The conceptual framework of the above ground assets methodology was a high level failure mode analysis supported by process specific questionnaires developed for site surveys.
A quantitative risk analysis was undertaken for Severn Trent Water covering the whole of the strategic water supply system. An optimal water allocation model was employed to determine the best operational responses to failure events. The outcome of the study was a ranking of schemes in terms of their risk-cost-benefit and the saving of considerable investment on security of supply projects. New more effective schemes were also identified as a consequence of the analysis.
The security of supply risk analysis undertaken at the strategic level for Severn Trent Water was extended to the district level, e.g. areas such as Stoke, Rugby and Mansfield.
A national study was undertaken for UKWIR to develop a methodology for the ranking of water supply investment schemes. The study included a survey of current UK practice in water supply risk analysis and the development of a flexible methodology suitable for large or small suppliers.
A study of the security of supply of the Selby ring main was undertaken for Yorkshire Water to identify capital and operational means of reducing risk.
A risk analysis was undertaken for Southern Water on the need for replacement or partial refurbishment of a major trunk main. The study found that the risk of failure would be reduced to an acceptable level by refurbishing only particular sections of the main resulting in considerable cost savings.
A risk analysis was undertaken for Southern Water to quantify the risk of groundwater pollution arising from the construction of a new trunk road along the line of a major chalk aquifer.
Advisory services were provided regarding the appropriate risk analysis methodology for the assessment of failure to meet time and cost targets in the construction of a large sewage balancing tunnel.
A review was undertaken of the risk methodology employed for the rationalisation of wastewater treatment works on the Isle of Wight. The objective of the rationalisation was to reduce the large number of small rural works to a small number of larger works.
An analysis of the risk reduction associated with a major refurbishment of a medium sized wastewater treatment plant was carried out for Southern Water. The conclusion identified that the residual risk of non-compliance after refurbishment was not acceptable, and identified short-term and long-term measures to achieve a satisfactory level of non-compliance risk.
Consultancy services were provided to a participant organisation in the National Consents Translation Project which sought to identify means of translating spot sample discharge consent conditions into consents based on composite sample. The brief included a fundamental review of the methodology proposed by the WRc and also all handling and analysis of data collected by the client.
Risk analyses of the probability and compliance consequences of power failure on both water treatment and wastewater treatment plants have been undertaken. Where necessary, site surveys were undertaken to assess equipment condition and to produce single line diagrams where non-existent. Recommendations for the replacement of equipment and reconfiguration of the system were provided.
A quantitative risk analysis was undertaken for Severn Trent Water covering the whole of the strategic water supply system. An optimal water allocation model was employed to determine the best operational responses to failure events. The outcome of the study was a ranking of schemes in terms of their risk-cost-benefit and the saving of considerable investment on security of supply projects. New more effective schemes were also identified as a consequence of the analysis.