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

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International Water Management Institute (IWMI)

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

Technology Business

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

Andes • Ganges • Limpopo • Mekong • Nile • Volta
Presentation outline
1. Key message
2. Background and Purpose
3. Methodology
4. Findings
5. Lessons
6. Recommendations

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

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

Andes • Ganges • Limpopo • Mekong • Nile • Volta
Background
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#*
#*
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

Andes • Ganges • Limpopo • Mekong • Nile • Volta
Methodology
Hydrological modeling
Wet season Dry season
Participatory methods

Andes • Ganges • Limpopo • Mekong • Nile • Volta
Findings

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

Andes • Ganges • Limpopo • Mekong • Nile • Volta
Findings
Major contribution:
Upstream catchments

Andes • Ganges • Limpopo • Mekong • Nile • Volta
Findings
- NE portion is most vulnerable
- Highly linked to landscape
attributes

Andes • Ganges • Limpopo • Mekong • Nile • Volta
Findings
- With vegetative buffers in place
- Erosion reduction by up to 15%

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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