by J. Barron, E. Kemp-Benedict, J. Morris, A. de Bruin, G. Wang and A. Fenci Presented at the Final Volta Basin Development Challenge Science Workshop, September 2013

1. A Partner
of
TAGMI: An Interdisciplinary Decisions Support Tool
in Agricultural Water Management Outscaling for
the Volta River Basin
Barron, J., Kemp-Benedict, E., Morris. J., de Bruin, A., Wang, G., Fencl, A.
this work is based on the V1 ‘Targeting and scaling out’ project led by SEI in
partnership with INERA, University of Ouagadougou, CSIR-SARI and KNUST

2. Andes • Ganges • Limpopo • Mekong • Nile • Volta
MAIN MESSAGES
• The TAGMI (Targeting AG water Management Interventions) is an
online decision support tool developed for supporting investments and
action in smallholder farming in Volta and Limpopo
 It includes both biophysical and social economic conditions influencing oustcaling
 It integrates multiple sources of expertise and knowledge
 It provides a measure of strength of prediction
• TAGMI can guide on geographical location opportunities based on
given conditions. However , implementation of action need to be done
with ‘best practise in implementation ‘ for successful outcome

3. Andes • Ganges • Limpopo • Mekong • Nile • Volta
BACKGROUND
Volta and Limpopo Basin Stakeholders demand in 2009:
“…the question of what AWM intervention can work where and why”
V1-L1 purpose :
To develop and evidence a knowledge-based tool to assess and map the
likelihood that a given intervention will be successful in given locations, at
the basin scale
-three technologies, two basins

4. Andes • Ganges • Limpopo • Mekong • Nile • Volta
APPROACH 1
• Process of consultation : incorporate various sources of knowledge
• Decide what is relevant AWM technologies, what is ‘success’
Consultation 2012Consultation 2011 Synthesis
Full Irrigation
Rainfed

5. Andes • Ganges • Limpopo • Mekong • Nile • Volta
APPROACH 2
• Merge interdisciplinary factors
with Bayes approach
• Develop web based interface in
open source and accessible data
layer

6. Andes • Ganges • Limpopo • Mekong • Nile • Volta
1.RESULTS: current TAGMI predictions
SWC Small scale irrigation Small reservoirs

7. Andes • Ganges • Limpopo • Mekong • Nile • Volta
1.RESULTS: current TAGMI predictions
Soil Water Conservation # districts
(%)
Cropland (% )
Total BF: 2846941ha
Total GH: 5102661 ha
Strength of
prediction
Burkina Faso High/Med/Low 51/25/25 61/20/20 Low
Ghana High/Med/Low 45/39/16 48/6/46 Low
Small reservoirs
Burkina Faso High/Med/Low: 50/32/18 47/20/32 Low
Ghana High/Med/Low: 62/15/23 58/36/7 Low

8. Andes • Ganges • Limpopo • Mekong • Nile • Volta
1.RESULTS: current TAGMI predictions
Example data input and impact

9. Andes • Ganges • Limpopo • Mekong • Nile • Volta
2. RESULTS: testing TAGMI for small reservoirs
MAPS……. Decision in SR may not
be done at HH level;
mainly in 80s

10. Andes • Ganges • Limpopo • Mekong • Nile • Volta
2. RESULTS: testing TAGMI for Soil water conservation
TAGMI predictions match
actual adoption rates for
about half of the provinces

11. Andes • Ganges • Limpopo • Mekong • Nile • Volta
LESSONS
• Data on social-human layers are critical, but rarely
available
• High agreement between factors affecting outscaling
across technologies, countries and basins
• The importance of Best Practice In Implementation (‘Due
diligence’ )to achieve successful outscaling
• There is opportunity for outscaling of SWC , smallholder
irrigation and small reservoirs but prediction strength is low

12. Andes • Ganges • Limpopo • Mekong • Nile • Volta
RECOMMENDATIONS TO POTENTIAL USERS
• Consider carefully weighting of factors contributing
for success and the implications on map output
• Opportunities to verify a/o cross check TAGMI
prediction
• Improve data especially on human-social domains
• Identify potential geographic spaces only half the
story: more effort in design of appropriate
implementation

13. Andes • Ganges • Limpopo • Mekong • Nile • Volta
www.seimapping.org/TAGMI
We thank all contributors:
absent colleagues
farmers, boundary partners and participants in consultations and events
VBDC colleagues, and LBDC and L1 colleagues
funders