In arid and semi-arid regions runoff-fed agriculture has been common for millennia. Recent geographical and archaeological investigations in the north-eastern part of ancient Marmarica (north-western Egypt) revealed a dense network of water harvesting systems associated with settlements and production sites dating back to Ptolemaic times. The environmental conditions and the ancient water management strategies are characterised by minimal intervention but maximised effect and optimised utilisation of the scarce water (100–150 mm seasonal discharge) and soil resources of the region.
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Vetter et al. (2009) studied this question.
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