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Recently in August, we experienced a flood in some part of Nepal and we are using methods developed by WHO. Please check the link below.
https://www.who.int/water_sanitation_health/publications/2011/tn1_cleaning_disinfecting_wells_en.pdf
https://www.unicef.org/cholera/Annexes/Supporting_Resources/Annex_9/WHO-tn2_cleaning_disinfecting_boreholes_en.pdf