Targeting interventions to reduce catchment sedimentation sub watershed in the White Volta basin

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by F. Kizito, E. Obuobie, J.P. Venot, C. Le Page and W. Daré
Presented at the Final Volta Basin Development Challenge Science Workshop, September 2013

Published in: Technology, Business
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Targeting interventions to reduce catchment sedimentation sub watershed in the White Volta basin

  1. 1. A Partner of Targeting interventions to reduce catchment sedimentation: The case of a sub-watershed in the White Volta Basin Kizito F., Obuobie, E., Venot J.P., Le Page C., and Daré W
  2. 2. Andes • Ganges • Limpopo • Mekong • Nile • Volta Presentation outline 1. Key message 2. Background and Purpose 3. Methodology 4. Findings 5. Lessons 6. Recommendations
  3. 3. Andes • Ganges • Limpopo • Mekong • Nile • Volta Key message - Study illustrates the relevance of distributed erosion models to target erosion control measures - Illustrates the use of vegetative buffer strips to reduce erosion rates by 10-20% - Importance of community involvement
  4. 4. Andes • Ganges • Limpopo • Mekong • Nile • Volta Background and Purpose - Study area lies in the White Volta Basin - Coverage of sub-basin is about 2,400 sq.km - Major issues relate to climate variability, poor soil functions, and reduced storage capacity of reservoirs - Intervention: landscape management to reduce erosion and sedimentation
  5. 5. Andes • Ganges • Limpopo • Mekong • Nile • Volta Background % % % _ _ _ _ _ _ _ _ _ _ _ _ ___ _ __ __ __ _ __ ___ __ _ __ __ ___ _ ___ ___ _ __ _ _ __ __ __ __ ___ __ _____ _ #* #* 5 5 5 5 55 5 5 5 5Nangodi on Red Volta Yarugu on White Volta BANSI BAWKU TILLI BIDURI BINABA TIMONDE KOSANABA WIDENABA NAFKULIGA ZONGOYIRI 0°0'0" 0°0'0" 11°0'0"N 11°0'0"N ± 0 7 14 21 283.5 Kilometers V4 Watershed 5 V4 Communities White Volta Basin Boundary _ Small reservoirs #* Flow Stations Rivers
  6. 6. Andes • Ganges • Limpopo • Mekong • Nile • Volta Methodology Hydrological modeling Wet season Dry season Participatory methods
  7. 7. Andes • Ganges • Limpopo • Mekong • Nile • Volta Findings
  8. 8. Andes • Ganges • Limpopo • Mekong • Nile • Volta Findings 0 200 400 600 800 1000 1200 1400 16000.00 100.00 200.00 300.00 400.00 500.00 600.00 1968 1973 1978 1983 1988 1993 1998 2003 Rainfall(mm) Discharge(m3/s) Rainfall Confidence band Observed Flow Simulated Flow
  9. 9. Andes • Ganges • Limpopo • Mekong • Nile • Volta Findings Major contribution: Upstream catchments
  10. 10. Andes • Ganges • Limpopo • Mekong • Nile • Volta Findings - NE portion is most vulnerable - Highly linked to landscape attributes
  11. 11. Andes • Ganges • Limpopo • Mekong • Nile • Volta Findings - With vegetative buffers in place - Erosion reduction by up to 15%
  12. 12. Andes • Ganges • Limpopo • Mekong • Nile • Volta Recommendations - Explore linkage with V1 on scaling out interventions - Targeted interventions are context specific dependent on the biophysical characteristics as well as social dimensions - Intervention need to consider associated environmental consequences, use of ecosystem based approaches would be appropriate

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