Notenbaert, An Maria Omer

Pfeifer, Catherine

CGSpace

Nile Basin Development Challenge (NBDC)Nile 3 on targeting and scaling out Objective : • Create feasibility map based on bio-physical and socio-economic criteria for rainwater management strategies (RMS)Up-coming challenges :• Mapping willingness of adoption• Define the borders of the landscape• Involve partners into the mapping • Develop a simple tool for partnersSuitability maps for individual practices :  combines bio-physical and socio-economic criteriaCombination 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)  http://nilebdc.org/September 2011 http://nilebdc.wikispaces.com/Mapping rainwater management strategies at landscape scaleCatherine Pfeifer (ILRI/IWMI), An Notenbaert (ILRI)ResultRainwater management strategy at landscape scale:A bundle of rainwater management practices (management decision taken by the smallholder or his community) that covers the whole gradient of the landscape and maximizes water retention or water productivity within the landscape. ObjectiveCreate feasibility maps for rainwater management strategies at landscape scaleincluding bi physical as well as s cio-economic criteriaApple tree Min temp<10cLuvisol, nitisol, leptosolDrought  risk< highMarket <8 hoursPlot size > 1 ha Mango trees NitisolSub‐humid zoneMarket <8 hoursPlot size > 1ha Bench terracing  Semi‐arid‐humidsoils drain.≠ poorSlope 12‐58%Household size Access to advice land frag.Agri.dependencyHillside terracing Arid and semi‐aridslope 10‐ 50%Pop. densityhousehold sizeplot size >1 ha Access to advice Land frag.Agri.dependencyRiver diversion 2.5km near riversoil texture=fineAccess to capitalhousehold sizeAccess to adviseCriteria for mapping :Conclusion:Feasibility map suggests site-specific menu of rainwater management practices to communities and smallholdersModeling approachMapping RMS at landscape scaleRainwater management strategy mapSuitability mappractice ASuitability mappractice BSuitability mappractice CTransformation into spatially explicit variables and threshold definition Identification of bio-physical conditions, socio-economic and institutional drivers for each individual practices (diversion, terraces, trees,…)RMS

Mapping rainwater management strategies at landscape scale

The	  3rd	  International	  Forum	  	  on	  Water	  and	  Food	  Tshwane,	  South	  Africa	  November	  14	  –	  17, 2011	  	   	   	  	  	  Co-­‐hosted	  by:	  	  	  	  	  M a p p i n g  r a i n w a t e r  m a n a g e m e n t  s t r a t e g i e s  a t  l a n d s c a p e  s c a l e  CATHERINE	  PFEIFER,	  AN	  NOTENBAERT	  1	  1ILRI	  	  	  c.pfeifer@cgiar.org	  	  S e s s i o n :  S A M  T W G  s h a r e  f a i r  	  	  International	  Forum	  on	  Water	  and	  Food	     S u m m a r y  A	   rainwater	   management	   strategy	   at	   landscape	   scale	   is	   a	   bundle	   of	   practices	   chosen	   across	   the	  gradient	  of	  a	  landscape	  to	  maximize	  a	  certain	  objective,	  e.g.	  water	  retention	  within	  the	  watershed.	  This	  paper	   presents	   a	   mapping	   procedure	   that	   allows	   for	   the	   identification	   of	   landscapes	   where	   a	   given	  rainwater	  management	  strategy	  is	  suitable.	  The	  approach	  predicts	  that	  for	  each	  practice	  that	  is	  part	  of	  a	  strategy,	  feasibility	  critera	  can	  be	  identified	  and	  mapped.	  	  Both	  bio-­‐physical	  and	  socio-­‐economic	  criteria	  are	   included	  and	   implemented	  as	  either	  a	   ‘killer’	  or	   ‘soft’	   criterion.	   	  Killer	   criteria	   represent	  necessary	  conditions	  without	  which	  a	  practice	  can/will	  not	  occur.	  	  They	  are	  modelled	  as	  binary	  maps.	  	  Soft	  criteria	  represent	   drivers	   which	   increase	   or	   decrease	   the	   willingess	   of	   adoption	   of	   a	   practice.	   	   They	   are	  implemented	  as	  normalized	  variables	  ranging	  between	  0	  and	  1.	   In	  a	  way	  they	  represent	  a	  probability.	  The	   combination	  of	   these	   two	  criteria	   results	   in	   suitability	  maps	   that	   show	   the	  gradient	  of	   suitability.	  	  When	  different	  practices	  are	  overlayed	  with	  a	   landscape	  map,	   landscapes	  within	  which	   the	   rainwater	  management	   strategy	   is	   suitable	   can	   be	   identified.	   	   This	   approach	   has	   been	   applied	   to	   the	   Blue	  Nile	  basin	   in	   the	   Ethiopian	   highlands	   for	   the	   strategy	   “orchard-­‐terracing-­‐river	   diversion”.	   	   For	   this	   first	  suitability	  maps,	  quatenary	  watersheds	  have	  been	  used	  as	  landscape.	  Results	  show	  that	  watersheds	  in	  the	  eastern	  part	  of	  the	  Blue	  Nile	  basin	  are	  suitable	  for	  the	  “orchard-­‐terracing-­‐river	  diversion”	  strategy.	  	  Key Message A	   mapping	   procedure	   that	   allows	   to	   identify	   landscapes	   where	   a	   given	   rainwater	  management	   strategy	   is	   suitable	   is	   presented.	   Bio-­‐physical	   and	   socio-­‐economic	   data	   are	  combined	  into	  suitability	  maps.	  	  

https://cgspace.cgiar.org/bitstream/10568/10392/1/SSe002_Final_RD_1210.pdf

Mapping rainwater management strategies at landscape scale

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