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I attach two factsheets. The one on floods and water supplies may be of interest to Richard - although it does not say much about rehabilitation. He may be more interested in some of the papers presented at the WEDC conference in Sri Lanka that dealt with well rehabilitation after the tsunami (e.g. https://wedc.lboro.ac.uk/conferences/pdfs/32/Saltori.pdf). People can search the conferences by year (Sri Lanka was 2006) or by a keyword in the title at https://wedc.lboro.ac.uk/conferences/search_conferences.php.
If the quality of the well water can't be quickly rectified then the technical briefs on household-level treatment may also be of interest to Richard:https://www.lboro.ac.uk/well/resources/technical-briefs/58-household-water-treatment-1.pdf, https://www.lboro.ac.uk/well/resources/technical-briefs/59-household-water-treatment-2.pdf
The second file that I attach may be of interest to the earlier enquirer (whose name I have forgotten) who was interested in latrines in flooded areas.
Brian