Reinier visser salinity and climate change acacia water
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Transcript of Reinier visser salinity and climate change acacia water
How to get freshwater in coastal areas?
Tackling salinity and climate change in Bangladesh and The Netherlands
Reinier Visser Water resources specialist
Intro Acacia Water
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Context of water availability in coastal zones
• 50% of world population in coastal zones • Fresh water availability under increasing pressure
– Increasing demand – Decreasing availability
• Current water management systems under pressure – Water follows function and focus on main water systems – little urgency for efficient water use – Lack of knowledge and the issue of perceptions – Enough water, but in the wrong place at the wrong time
Increased vulnerability: decreasing access to sufficient water of good quality
We have options to adapt to these changes, but we will face many challenges
So what can we do?
• Improve resources management • Demand management • Increase capacity
Strategy towards sustainable water management in coastal zones
• Getting the facts on the table • Making both the physical and the
institutional landscape more robust through an integrated landscape approach
• More long term solutions; think small, not just big
Many buffering options
Example cases Bangladesh – The Netherlands: similar systems for different uses
– Bangladesh – MAR for rural water supply – The Netherlands – MAR for agriculture
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Bangladesh - MAR system
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Goal: Fresh water self sufficiency and reliable access safe water in saline areas
Advantages
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• Improved year-round water availability
• Improved water quality and reduced health risks
• Suitable for local-scale application • Cost-effective • Resilient to disasters
Upscaling
• 20 systems tested, 75 additional systems being implemented
• Over 1 million people could use this system within 3 target districts in Bangladesh
• Many saline deltas world-wide • Main challenges:
– O&M and management – Institutional setting
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Spaarwater (Save-water): agricultural water conservation in saline delta’s
Goal: Fresh water self sufficiency and optimized crop yields in saline areas
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Closing the cycles • Testing different technologies, example Spaarwater Location Breezand
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CAPTURING STORAGE USE
Capturing and storing • Source: 1.5 ha tile drainage via collector drain • Storage
– Subsurface storage (10m – 20m below surface) – 1 infiltration well & 3 abstraction wells (2 filters each) to enhance removal of biological
contaminants
ditch
üEC ûEC
Tile drainage
Filter
Subsurface storage
-10m
-20m
brakish water
fresh water
Optimizing water usage – Subsurface drip irrigation and fertigation – Real time monitoring (groundwater and soil
moisture) – Real time control of water and nutrient flows
Subsurface drip irrigation
-10m
-20m
brakish water
fresh water
Drip lines
Moisture in the rootzone
Dry
Participatory planning process
Based on facts and knowledge of all stakeholders; sustainable strategies and measures are dra7ed and eventually implemented.
Improved water management, a joint responsibility
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• Participation of all stakeholders in water management and monitoring • Decentralized water management enabled by new technology • Local (user) monitoring data linked to central database
Cooperation between Acacia Water, akvo and SODAQ
The smartphone as a lab
Concluding remarks • Bangladesh – The Netherlands, similar systems different use
– Bangladesh low-tech low cost (manual operation) – NL high-tech higher cost (automatic operation)
• Many other solutions available, huge potential for improving water availability in coastal areas
• Integrated approach to achieve sustainable strategies and measures • All stakeholders participate
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More information: Bangladesh MAR system:
– Video: Underground Freshwater Storage- a cross country learning – Book:
Underground fresh water storage A practical solution to increase water security in saline deltas
Farming water supply systems:
– www.dynamicwatersystems.nl – www.spaarwater.com
www.acaciawater.com
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