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Hi - here is one study: https://pdfs.semanticscholar.org/ac36/e0448c1da51c58e964f34f807e5d4fe2dd94.pdf

WaterAid did some extensive comparative testing in the Niassa province in Mozambique between 2003-2006, I used to have this data, but I would to really dig back into my ancient digital archives on CDs to find it, but with the rope pumps that had been built with complete covers and splash run-off, we found there was little to no difference between a rope pump on a shallow well in comparison to an Afridev on a shallow well. What made the main difference appeared to be more related to the condition of the well head protection. Deeper boreholes performed statistically better, but we found that the Afridev was simply better beyond 30m. This body of evidence and many years of work careful advocacy with the Mozambican government resulted in the classifying rope pump acceptable for self-supply but not for communal supplies.