ABSTRACT
Water supply in Bangladesh is mainly dependent on GW and there are some specialized/technical processes to bring that water from underground to surface and drillers are the most important and first tier of resources in this context. In 2020 an extensive survey and analysis have been done in three different parts in Bangladesh which includes Gowainghat, Daudkandi, and Assasuni with the support of DPHE-UNICEF and found that approximately > 85% tubewell are installed by local drillers individually which can extensively influence safe water coverage. But there is gap between their authorization process and knowledge. Among those surveyed 126 drillers about 33% do not have any knowledge about As and 30% driller consider clear water for a successful well instead of As. In these areas about 38180 private well are installed by local drillers and approx. 48% wells are still As contaminated. It's not practical to have geological and Hydrogeological information from all over the country. So these add-ons can help to do some detail study. In Daudkandi, Gowainghat and Assasuni general ideas of oxidized sediments distribution in shallow aquifers were identified and expanded from driller's mapping. From their long experiences aquifers and aquitard distribution can be assumed and used in extensive analysis. So they can play an important role for scaling up safe water coverage in Bangladesh.
