Pre & Post Project Renovation Assessment

Guidelines for Pre and Post Rehabilitation Assessment

Reference: 99/DW/02/19
ISBN: 1 84057 172 1
Published Date: 17/04/2002

Water companies undertake pre and post rehabilitation assessment (PPRA) to demonstrate the improvement to water quality following mains rehabilitation. This project was instigated to undertake an assessment of completed PPRA schemes and to develop guidelines to help companies to design their distribution system PPRA. Other objectives were to investigate the relationship between water quality and internal mains conditions (serviceability) and to identify trunk main PPRA requirements. The report contains the findings from the assessment of 51 schemes and step- by- step guidelines for all aspects of PPRA. Some issues need to be clarified with DWI. Conclusions for the other objectives are given

Price: £12  

Mains renovation pre and post renovation assessment improving understanding

Reference: 00/DW/02/21
ISBN: 1 84057 194 2
Published Date: 17/04/2002

The study demonstrated that current methodologies are robust and provide reliable performance information. Alternative techniques are proposed; the most promising are continuous monitoring and use of hydraulic models to assist in site selection. The study has provided an increased awareness of many issues affecting the implementation of the PPRA process. Suggestions for optimisation of sample site selection are proposed. The use of hydraulic models has been appraised. Developments in in- line monitoring, particularly for turbidity, are taking place and are expected to result in apparatus which offer advantages for the PPRA process.

Price: £16  

Investigating Water Mains Pre and Post Renovation Assessment Data

Reference: 98/DW/02/16
ISBN: 1 84057 142 X
Published Date: 17/04/2002

In order to contribute to the understanding and evolution of the PPRA process, this research contract has the following objectives:
Based on PPRA data and other relevant data, derive a suite of criteria, statistical methods and sampling programmes that demonstrate water quality improvements most appropriate to given circumstances.
Develop existing methodology and/or new methods for agreeing schemes in AMP II and to support proposals for AMP III, including consideration of improvements in field data collection, non-steady-state flow simulations, serviceability, aesthetic water quality and other techniques to demonstrate improvements for customers.

Price: £14