Key points are not available for this paper at this time.
Weiß, M., R. Schaldach, J. Alcamo, and M. Flörke. 2009. Quantifying the human appropriation of fresh water by African agriculture. Ecology and Society 14(2): 25. https://doi.org/10.5751/ES-02974-140225
Weiß et al. (Thu,) studied this question.