Poster by Catherine Pfeifer and An Notenbaert for the NBDC Stakeholder Forum, Bahir Dar, Ethiopia, 5 October 2011.

1. Nile Basin Development Challenge (NBDC)
Nile 3 on targeting and scaling out
Mapping rainwater management strategies at landscape
scale
Catherine Pfeifer (ILRI/IWMI), An Notenbaert (ILRI)
Conclusion:
Objective :
Objective Feasibility map suggests site-specific menu
CreateCreate feasibility map
• feasibility maps for rainwater of rainwater management practices to
based on bio-physical and
management strategies at landscape scale communities and smallholders
including bio-physical as criteria socio-
socio-economic well as for
economic criteria management
rainwater Up-coming challenges :
• Mapping willingness of adoption
strategies (RMS) • Define the borders of the landscape
• Involve partners into the mapping
• Develop a simple tool for partners
Rainwater management strategy at landscape scale:
A bundle of rainwater management practices (management
decision taken by the smallholder or his community) that covers Result
the whole gradient of the landscape and maximizes water
retention or water productivity within the landscape. RMS
Modeling approach
Identification of bio-physical conditions, socio-economic and
institutional drivers for each individual practices
(diversion, terraces, trees,…)
Transformation into spatially explicit variables and threshold
definition
Mapping RMS at landscape scale
Criteria for
Suitability map Suitability map Suitability map mapping :
practice A practice B practice C Apple tree Min temp<10c Market <8 hours
Luvisol, nitisol, Plot size > 1 ha
leptosol
Drought risk< high
Mango trees Nitisol Market <8 hours
Sub‐humid zone Plot size > 1ha
Bench terracing Semi‐arid‐humid Household size Access to advice
soils drain.≠ poor land frag.
Slope 12‐58% Agri.dependency
Hillside terracing Arid and semi‐arid Pop. density Access to advice
Rainwater management strategy map slope 10‐ 50% household size Land frag.
plot size >1 ha Agri.dependency
River diversion 2.5km near river Access to capital Access to advise
soil texture=fine household size
Suitability maps for individual practices : combines bio-physical and socio-economic criteria
Combination can be based on equal weighting (used here), weight of evidence (Bayesian weight), mapping
willingness of adoption by up-scaling household data (poverty mapping approach)
September 2011 http://nilebdc.wikispaces.com/ http://nilebdc.org/