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Piloting rainwater harvesting for MUS in Dire Dawa, Ethiopia

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Presentation sharing the lessons on piloting rain water harvesting for MUS in Dire Dawa, Ethiopia. By Sean Patrick, RAIN Foundation. Presentation during the Seminar on Multiple Use Water Services in the context of Dutch policy and practice. Wednesday 26 June 2013, The Hague, The Netherlands.

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Piloting rainwater harvesting for MUS in Dire Dawa, Ethiopia

  1. 1. EVERY DROP COUNTS!Sean Patrick- 26th June2013
  2. 2. Piloting Rainwater Harvesting for MUSDire Dawa, Ethiopia –The lessonsSean Patrick- 26th June2013
  3. 3. Sand dams & Subsurface dams• Small dam built on seasonalriverbeds,• the raised wall captures some ofthe surface runoff and storedwithin the coarse sand deposits• Wall is built above ground,• with a spillway to allowcontinuous flow of waterdownstreamSean Patrick- 26th June2013
  4. 4. Subsurface…• SSD- impervious wallconstructed on a bedrock ina trench across thevalley/stream• Wall is below ground andholds flow of a naturalaquifer• Capacity for the damincreased easily by addinglayer of concrete wallSean Patrick- 26th June2013
  5. 5. The Lessons• Institutional arrangements, Coordination andHarmonization,• Determining technology choices• Technical design considerations, and• MUS Field implementation considerationsSean Patrick- 26th June2013
  6. 6. Institutional, Coordination andHarmonisation• Participation is not a straight forwardconcept• High capacity demands• Lateral and diagonal communication verycrucial though difficultSean Patrick- 26th June2013
  7. 7. Technology choice• Local resources available• Topography factorsSean Patrick- 26th June2013
  8. 8. Technical design considerations• MUS: proper needs and sourceassessment takes time• Projects need to be flexible toaccommodate possible design alterations– Gravity water– Deep trenchingSean Patrick- 26th June2013
  9. 9. MUS Field implementationFinancial implicationsCement vs clayMachinery vs local labourTiming matters- flash floodsSean Patrick- 26th June2013
  10. 10. Challenges for Replication• Topographical suitability(RB 25metres, hilly, soil- sand and gravel,reservoir should be based upon impermeablebedrock,• High technical requirementsNot readily available in rural communities…continued need for NGO supportSean Patrick- 26th June2013
  11. 11. Justification: Benefits Vs Cost• Undeniable need of clean water in arid and semi-aridareas• Highly effective method in areas with limited rainfalland dependable infrastructure• Dam capacity expansion is cheaper; raising the wallsSean Patrick- 26th June2013
  12. 12. Justification…• Strong community involvement, old systemimproved• Use of locally available resources and• Substantial offshoot benefits: re-vegetations,landscape management, new ecological zonesand agri-practisesSean Patrick- 26th June2013
  13. 13. Thank YouSean Patrick- 26th June2013

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