Coloured water: pragmatic models and complex realities of communicating water functions in landscapes Jennie Barron Stockholm Environment Institute at University of York (UK) And Stockholm Resilience Center, Stockholm University, (Sweden) ICID, London, 22 February, 2013
Contributions to todays discussion: -the issue, the concept and some examples of green blue water applications - the challenges at landscapes, with complex water use - conclusions /discussion points
Green and blue (grey) water flows and storages Green water flows total evapotranspiration Productive green flow Plant transpiration Non-productive green flow Evaporation flows Green water resource soil moisture generated from direct rainfall infiltration on its way to vaporize Blue water flow surface runoff and base flow Blue water resource groundwater, lakes, reservoirs, wetlands Grey water
The issue: CA, 2007 Raising freshwater, - and particular water for agriculture, on the global and local agenda
CA (2007): Re instated focus on rainfed crop production, - and outlined various dependencies at regional level 2 options: Increase water for food production CA 2007, Increase water productivity
Powerful model from field to national and global INDIA KENYA Rockstrom, Jansson, Barron 1998 SEI, 2005
Tot available water (m3/cap/yr) particularly relevant for water quantity.. 4000 3500 Blue water scarcity Uganda Closing in on green water shortage Et hiopia Closing in on blue water shortage 3000 2500 2000 1500 Erit rea M orocco Algeria Syria Tunisia China India Egypt Bangladesh Japan Green water scarcity 1000 Iraq Pakist an 500 Jordan 0 0 500 1000 1500 2000 2500 3000 3500 4000 Available blue water (m3/cap/yr) Rockstrom et al. 2009
The complex reality of use, users and opportunities 1. Trend: smallholder irrigation at landscape scale 2. Trend: recognition of water to provide functions 3. Trend: need for building resilience in short and long term
1. Emerging trend : smallholder irrigation development not on the radar? Sustainability & equity concerns AgWater Solution Area under smallholder irrigation (ha) Burkina Faso 10 000 46 000 Ethiopia 350 000 289 600 Ghana 185 000 30 900 Tanzania 150 000 184 300 AQUASTAT Total agr. water mg area (ha) Zambia 90 000 255 900
Example at landscape scale 1: what is blue and green in time space? Jahldaka, West Bengal Water abundance and scarcity Population Poverty Water in politics
Example at landscape scale 1: what is blue and green in time space? Jahldaka, West Bengal
Example at landscape scale 2: what is blue and green in time space? Nariarle, Burkina Faso Livelihood & environmental cost Reduce outflow during dry season Water quality Management of structures Inequity Unrealised potential: - Improve current low yield rainfed 3-4 times SEI-AgWater Solutions 2012
Example at landscape scale 2: what is blue and green in time space? Nariarle, Burkina Faso Agricultural incl. irrigation, area increases Small reservoir volume from 0 to 2% annual rainfall Irrigation 1% of watershed 1950 2010 20-yrs rainfall 900mm 700 mm ETa 77% 88% GW recharge 10% 3% Roff 12% 9% Water balance shifts: implication for green blue estimates?
2. Water providing functions Water productivity needs to consider the multiple benefits generated by ecosystem services for human well-being and for nature Water-productivity gains have often been achieved out of balance with landscape ecosystem services Balancing the goals of agro-ecosystems with landscape ecosystem services can produce synergies and improve overall water productivity water productivity improves if move beyond provisioning services..
2. Water providing functions Hydrological attribute Quantity Quality Location Timing Principal Ecohydrological process surface & gw storage and flow Sediments Nutrients Salts Pathogens Other substances particles Up/downstream Ground/surface Biotic/abiotic (within vegetation) In/out channel Peak flows, base flows Velocity /rate/intensity? Water providing functions through storage and flow processes Ecosystem services Provisional Regulating Supporting Cultural
3. Water for short and longterm resilience building: mounting pressures and uncertainties Steffens et al2011
3. Water for short and longterm resilience building : needs for new approaches? The role and functions of water to persist undesired change (droughts, dryspells, disease, flood) The capacity role and to adaption (internal, external social and biophysical change) The capacity to transform (innovation in social and infrastructure/technology)
Concluding points for discussion: Colour of water can help identify issues, but may be less useful pointing towards solutions.. We need different tools to engage Trends in agricultural water management development, and needs for technology and infrastructure to address poverty, food security and sustainability, can be further confused by colouring water at landscape scale what are meaningful engagement models fro complex water issues? Considering only provisioning of goods for water appropriation (green or blue) ignores fundamental functions of water, possibly undermining sustainability in management.. Are there approaches to better reflect the benefits of waterflows?
Concluding points for discussion: CA, 2007 UNEP-SEI 2012
Thank you!!
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