Apples and oranges: a comparative assessment in WASH

A few weeks ago, an interesting email discussion was held on “water point mapping” D-Group of the Rural Water Supply Network (RWSN). Part of the discussion focused on how much it costs to map or monitor all water systems in a country. Various figures were floating around in the discussion. But when looking at these in more detail, it was like comparing apples to oranges. Some of the costs mentioned had included the staff time of (local) government, others hadn’t, as they considered this to be a fixed cost; some referred only to a simple mapping of water points, others had done a more comprehensive collection of all kinds of data of the water points; some of the data were expressed in dollars per water point, others in local currency per person. So, no immediate sense could be made of the numbers. A former colleague once said: “an apple is…