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https://waterservicesthatlast.wordpress.com/2014/02/07/the-performance-of-piped-water-systems-versus-handpumps-in-growing-rural-growth-centres-2500-to-7500-people/
This has some good reference numbers for rural growth centres, and some food for thought regarding the old question if piped supply systems are "too expensive".
https://waterservicesthatlast.wordpress.com/2014/02/07/the-performance-of-piped-water-systems-versus-handpumps-in-growing-rural-growth-centres-2500-to-7500-people/
This has some good reference numbers (per person, but it also mentions population and water usage this is based on) for rural growth centres, and some food for thought regarding the old question if piped supply systems are "too expensive".