The Water Engineering Development Centre (WEDC) based at Loughborough University, UK – have a wide range of excellent educational videos covering the construction and maintenance of water supply and sanitation for use in developing countries.
https://www.lboro.ac.uk/research/wedc/resources/videos/
WEDC is a globally leading research group that undertakes high-calibre and creative multidisciplinary research. It provides high quality, research-led education and training for the next generation of professionals and leaders to tackle global challenges in the broad field of water engineering and development.