Road runoff harvesting is practiced in many parts of the world - wherever there is a combination of dry conditions and farmland alongside a road. The advantages are obvious: roads provide a hard surface with a high runoff coefficient (whether tarmac or "dirt"), and drainage is integral to road design. Thus, runoff is de facto available and land users can "tap into" this supply of water. Technically, this is a specific form of external water harvesting catchment system. Despite being very widespread, it rarely features in water harvesting manuals, and it is certainly underestimated in extent and contribution to small-scale farming in dry areas. However Ngigi (2003) estimates that some 4,000 hectares of land within one dry area in Kenya (Kitui District) benefit from this additional supply of water.

Source: Critchley, W. Di Prima S. and Tuyp, W. 2012 "Sustainable Land Management in Sub-Saharan Africa" Information cards accompanying a box-set of 12 videos.

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