assessing and upscaling water harvesting potentials: a

Wageningen University & Research Centre P.O. Box 47, 6700 AA Wageningen, the Netherlands Tel: + 31 317 48 65 77 – Fax: +31 317 41 90 00 E-mail: [email protected] This project has been ﬁnanced through the partnership program of the Dutch Ministry of Foreign Affairs/General Directorate for International Cooperation and Wageningen University and Research Centre as part of the project “Improving livelihood and resource management in Central Rift Valley of Ethiopia”. Assessing and upscaling water harvesting potentials: A case study in the Central Rift Valley, Ethiopia Girma Moges, H.C. Jansen, H. Hengsdijk, W.B. Hoogmoed & J. Froebrich Introduction • Agriculture is the mainstay of the Ethiopian economy. • The agricultural sector in Ethiopia heavily depends on rain- fed agriculture. • The amount of rainfall and the duration of the rainy season are very variable. • Crops yields and incomes are low, food shortages and famines occur frequently. • The potential for (perennial) irrigated agriculture is often limited. • Global climate change may aggravate the situation. Regional planning of water harvesting • Integrate biophysical suitability indicators and indigenous knowledge. • Use GIS functionalities (a.o. upscaling to large spatial units). • Conduct multi-objective multi-criteria evaluations of suitability indicators. Methodology Conclusions • > 50% of the CRV is suitable for micro-catchment (in-situ) water harvesting (from a biophysical perspective). • ± 50% is suitable for macro-catchment (ex-situ) water harvesting. • The potential for water harvesting in the CRV is still largely unexploited. • The methodology can assist planners and policy makers in regional land and water management (quick-scans). Suitability map of micro-catchment (in-situ) water harvesting. Suitability map macro-catchment water harvesting. Example Assess the potential of macro- (ex-situ) and micro- (in-situ) catchment water harvesting techniques in the Central Rift Valley. Farmers consultations & field surveys Development of biophysical suitability indicators Evaluation of indicators (& standardization) Up-scaling / GIS model with MCE Expert judgment and literature review Suitability map for ponds Suitability map for in- situ water harvesting Data analysis / sensitivity analysis Validation Selection of test sites and farmers ⇒Adaptive strategies should focus on increasing the resilience of rain-fed farming systems ↓ Better management of the rainwater needed ↓ Assess seasonal water harvesting potentials Poster_Hengsdijk_3.indd 1 29-6-2010 10:00:44

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Page 1: Assessing and upscaling water harvesting potentials: A

Wageningen University & Research CentreP.O. Box 47, 6700 AA Wageningen, the NetherlandsTel: + 31 317 48 65 77 – Fax: +31 317 41 90 00E-mail: [email protected]

This project has been financed through the partnership program of the Dutch Ministry of Foreign Affairs/General Directorate for International Cooperation and Wageningen University and Research Centre as part of the project “Improving livelihood and resource management in Central Rift Valley of Ethiopia”.

Assessing and upscaling water harvesting potentials: A case study in the Central Rift Valley, EthiopiaGirma Moges, H.C. Jansen, H. Hengsdijk, W.B. Hoogmoed & J. Froebrich

Introduction • Agriculture is the mainstay of the Ethiopian economy. • The agricultural sector in Ethiopia heavily depends on rain-

fed agriculture. • The amount of rainfall and the duration of the rainy season

are very variable. • Crops yields and incomes are low, food shortages and

famines occur frequently. • The potential for (perennial) irrigated agriculture is often

limited. • Global climate change may aggravate the situation.

Regional planning of water harvesting • Integrate biophysical suitability indicators and indigenous

knowledge. • Use GIS functionalities (a.o. upscaling to large spatial units). • Conduct multi-objective multi-criteria evaluations of

suitability indicators.

Methodology

Conclusions • > 50% of the CRV is suitable for micro-catchment (in-situ)

water harvesting (from a biophysical perspective). • ± 50% is suitable for macro-catchment (ex-situ) water

harvesting. • The potential for water harvesting in the CRV is still largely