Roads for water: the unused potential

Roads are generally perceived as infrastructure to deliver transport services, but they are more than that. They are major interventions in the hydrology of areas where they are constructed – concentrating runoff and altering subsurface flows. At present, water-related damage constitutes a major cost factor in road maintenance. Using ongoing research from Ethiopia, this article argues to reverse this and turn water from a foe into a friend and integrate water harvesting with road development. Optimized road designs are required – better planning of alignments, making use of road drainage, road surfaces, and river crossings, but also capturing freshly opened springs and systematically including developing storage and enhanced recharge facilities in road-building programmes. Equally important are inclusive planning processes that are sensitive to the multi-functionality of roads but also to the potentially uneven distribution of benefits and the diverse livelihood impacts. There is a need for closer integration of watershed and road-building programmes. With 5.5 million kilometres of roads in sub-Saharan Africa alone, and road building continuing to be one of the largest public investments, the potential of roads for water harvesting is great.

[1]  J. Riverson,et al.  Rural Roads in Sub-Saharan Africa: Lessons from World Bank Experience , 1991 .

[2]  A. Venables,et al.  Infrastructure, Geographical Disadvantage, and Transport Costs , 1999 .

[3]  Joachim Ahrens The Central Asian Economies Since Independence , 2007 .

[4]  C. Sadoff Managing water resources to maximize sustainable growth : a World Bank water resources assistance strategy for Ethiopia , 2008 .

[5]  D. Bryceson,et al.  Roads to Poverty Reduction? Exploring Rural Roads' Impact on Mobility in Africa and Asia , 2008 .

[6]  F. Wilson Towards a Political Economy of Roads: Experiences from Peru , 2004 .

[7]  M. Mashiri,et al.  Social exclusion and rural transport: Gender aspects of a road improvement project in Tshitwe, Northern Province , 2001 .

[8]  Antonio Estache,et al.  World development report 1994 : infrastructure for development , 1994 .

[9]  Ian Neal The potential of sand dam road crossings , 2012 .

[10]  Africa Region Working Paper Series No.18 , 2001 .

[11]  M. Ericson Policy perspectives of road traffic injury in developing Asia , 2008 .

[12]  B. Kubbinga,et al.  Road Runoff Harvesting in the Drylands of Sub-Saharan Africa: Its Potential for Assisting Smallholder Farmers in Coping with Water Scarcity and Climate Change, Based on Case Studies in Eastern Province, Kenya , 2012 .

[13]  P. Jungerius,et al.  Road construction and gully erosion in West Pokot, Kenya , 2002 .

[14]  T. Jayne,et al.  Input use and market development in Sub-Saharan Africa: an overview , 2003 .

[15]  Åke Hermansson,et al.  Control of Pavement Water and Pollution Prevention , 2009 .

[16]  J. Faurès,et al.  Guidelines on spate irrigation. , 2010 .

[17]  Aaron deGrassi Transport, Poverty and Agrarian Change in Africa: Models, Mechanisms and New Ways Forward , 2005 .