identifying solutions for a water-stressed world
TRANSCRIPT
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Identifying solutions for a water-stressed
world
Alain VidalICID2015, Montpellier, October 2015
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Challenges for today and tomorrow
Source: OECD
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Global water scarcity
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Climate variability will impact on food production
Source: Socioeconomic Data and
Applications Center (SEDAC)
• Crop yields drop by 2050 underBAU Maize 16%
Rice 21%
Wheat 42%
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The water crisis : a global risk to business
Source: Global Risks Perception
Survey 2014.
World Economic Forum, Global
Risks 2015 - Insight Report
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Identifying solutions for a water-stressed world
1. ‘Smart’ irrigation2. Waste water reuse3. Groundwater governance 4. Help agriculture become
part of climate solutions
Photo: Hamish John Appleby/IWMI
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Incentives to rapid expansion of drip irrigation…Yet suitability depends on context
Photo: Hamish John Appelby / IWMI
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Bring smart and affordable ICT to everyday farm management for smallholders
• Mobile-phone and web-based agro-advisory system developed and tested in Sudan, Ethiopia and Egypt
• Spatial data translated into simple SMSs - both qualitative and quantitative, and both on-demand and weekly “push”
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Precision surface irrigation A viable alternative to drip irrigation
Pakistan: Land and Water productivity increases, reduced diesel costs
Photos: Arif Anwar / IWMI
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0
5
10
15
20
25
30
Diluted
wastewater
or polluted
water
Untreated
wastewater
Groundwater Treated
wastewater
River Other
surface
water bodies
Rainfed Irrigation
canal
Open
drainage
Nu
mb
er
of
cit
ies
In and around three of four cities in the developing world, farmers use polluted irrigation water for the production of high-value crops
Global survey - irrigation source in urban & peri-urban areas
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Photo: Pay Drechsel/IWMI
Wastewater: a valuable asset
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Growth of irrigation in India driven by groundwater
0
5000
10000
15000
20000
25000
30000
35000
40000
45000
Irri
gate
d a
rea
in 1
00
0 h
a
Canal irrigated area Tank irrigated area Groundwater irrigated area
Canal
Tanks
Source: Mukherji et al. 2013.
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India: Twin cases of ‘over-abstraction’ and ‘under-utilization’
Source: IWMI
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Solar pumps – renewable, but sustainable? Getting the incentives right
Infographic: Rachel Cramer / IWMI
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Help agriculture become part of the climate solutions
“Business as usual” (BAU) agriculture emissions would comprise ~50% of allowable emissions to achieve a 2°C world
Gt CO2e per year
9 11
40
74
2010 2050(Business as usual)
2050(2°C target)
Non-agricultural
emissions
Agricultural and
agriculture-driven
land-use change
emissions
~50%
49
85
22
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Alternate-Wetting-and-Drying (AWD)
30% water
20-50% GHG
Without compromising yield
• Keep flooded
for 1st 15 days
and at flowering
• Irrigate when
water drops to
15 cm below the
surface
0
2
4
6
8
10
12
14
16 15.0
8.7
-42%
0
2
4
6
8
10
12
14
16
t C
O2
-eq
/ h
a*s
easo
n
4.93.9
-20%
0
2
4
6
8
10
12
14
16
0
2
4
6
8
10
12
14
16
-22%-28%
6.04.7
6.44.6
Hilly mid-slopes Delta low-lying
Summer-
Autumn
Winter-
Spring
Sander et al. in press IRRI
AWD Conventional
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EAST AFRICA Irrigation – unexplored opportunity
Increase, stabilize,
diversify production
Climate resilience
60%
increase in soil carbon*
*temperate systemEntry et al. 2002
Major policy initiative in
African Nations
Led
by:
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Smart water solutions
Because of increasedvariability, a continuum of water management technical and institutionalinnovations are needed
decentralized, adaptable, inexpensive
applicable under scenarios of increasing or decreasingrainfall