28While the practice of rainwater harvesting (RWH) can be traced back millennia, the degree of its 29 modern implementation varies greatly across the world, often with systems that do not maximize 30 potential benefits. With a global focus, the pertinent practical, theoretical and social aspects of RWH 31 are reviewed in order to ascertain the state of the art. Avenues for future research are also identified.
32A major finding is that the degree of RWH systems implementation and the technology selection are