Protected borehole.
https://www.emergency-wash.org/water/en/technologies/technology/protected-borehole
👉🏼 PDF: https://app.box.com/s/mfj9fzigr2kmpqjmzts240chpdisgt2n ___ A Protected Borehole is a small diameter drilled hole that is lined and covered, with water withdrawn using a pump. Existing boreholes can be equipped quickly to provide water in the acute response phase, but new boreholes, with the exception of jetted wells, are normally reserved for the stabilisation phase, as they can take several months to organise and complete.