Water Resources: Surface Water Monitoring for climate resilience and food security in Timor-Leste
- Timor-Leste faces high climate vulnerability, with irregular rainfall, frequent droughts, cyclones and strong El Niño/La Niña events.
- Water scarcity is persistent due to limited permanent water bodies and rapid runoff, leaving agriculture highly exposed to drought.
- ESA’s GDA Water Resources activity, in collaboration with the Asian Development Bank (ADB), applies Earth observation to track surface-water dynamics and support climate-resilient water management.
- EO insights feed into ADB assessments, guiding investments for agriculture, water harvesting and rural resilience.
Location
Timor-Leste
Institutions
- Timor-Leste faces high climate vulnerability, with irregular rainfall, frequent droughts, cyclones and strong El Niño/La Niña events.
- Water scarcity is persistent due to limited permanent water bodies and rapid runoff, leaving agriculture highly exposed to drought.
- ESA’s GDA Water Resources activity, in collaboration with the Asian Development Bank (ADB), applies Earth observation to track surface-water dynamics and support climate-resilient water management.
- EO insights feed into ADB assessments, guiding investments for agriculture, water harvesting and rural resilience.
Location
Timor-Leste
Institutions
Timor-Leste’s rivers rise and fall rapidly, with much of the water flowing to the sea before it can be stored. With limited national monitoring systems, tracking this variability at scale remains a challenge.
Using Sentinel-1 radar and Sentinel-2 optical imagery, ESA’s GDA Water Resources activity produced multi-year composites covering 2018–2022.
The time-series map reveal pronounced seasonal and interannual fluctuations, strongly influenced by El Niño and La Niña cycles.
In the animated layers, changes in water coverage over time become visible, helping establish a baseline understanding of seasonal patterns and periods of heightened water stress.
Location
Timor-Leste
Institutions
Timor-Leste’s rivers rise and fall rapidly, with much of the water flowing to the sea before it can be stored. With limited national monitoring systems, tracking this variability at scale remains a challenge.
Using Sentinel-1 radar and Sentinel-2 optical imagery, ESA’s GDA Water Resources activity produced multi-year composites covering 2018–2022.
The time-series map reveal pronounced seasonal and interannual fluctuations, strongly influenced by El Niño and La Niña cycles.
In the animated layers, changes in water coverage over time become visible, helping establish a baseline understanding of seasonal patterns and periods of heightened water stress.
Location
Timor-Leste
Institutions
Large lakes reveal the strongest signals of variability. At Lake Ira Lalaro, Timor-Leste’s largest water body, EO analysis from 2018–2022 shows water extent fluctuating between over 30 km² and below 10 km².
The five-year water-frequency map highlights how much of the lake holds water only intermittently, with many areas inundated for less than half the year.
These fluctuations underscore the vulnerability of water-dependent sectors and the urgency of strengthening resilience strategies.
Location
Timor-Leste
Institutions
Large lakes reveal the strongest signals of variability. At Lake Ira Lalaro, Timor-Leste’s largest water body, EO analysis from 2018–2022 shows water extent fluctuating between over 30 km² and below 10 km².
The five-year water-frequency map highlights how much of the lake holds water only intermittently, with many areas inundated for less than half the year.
These fluctuations underscore the vulnerability of water-dependent sectors and the urgency of strengthening resilience strategies.
Location
Timor-Leste
Institutions
Nearly all farmland in Timor-Leste is rain-fed and less than 10% is irrigated. Dry-season water shortages severely constrain crop production and affect rural livelihoods.
At Lake Seloi Kraik, EO analysis shows a pronounced decline in minimum water extent between 2019 and 2020, following the 2018 El Niño drought. This reduction signals a drop in water availability, a critical metric for agriculture.
These insights link climate shocks directly to declining water resources, helping authorities identify where water-harvesting structures, small-scale irrigation and resilience measures are most urgently needed.
Location
Timor-Leste
Institutions
Nearly all farmland in Timor-Leste is rain-fed and less than 10% is irrigated. Dry-season water shortages severely constrain crop production and affect rural livelihoods.
At Lake Seloi Kraik, EO analysis shows a pronounced decline in minimum water extent between 2019 and 2020, following the 2018 El Niño drought. This reduction signals a drop in water availability, a critical metric for agriculture.
These insights link climate shocks directly to declining water resources, helping authorities identify where water-harvesting structures, small-scale irrigation and resilience measures are most urgently needed.
Location
Timor-Leste
Institutions
EO impact key takeaways
- Time-series EO shows how surface-water extent changes seasonally and between years, revealing clear impacts from El Niño/La Niña cycles.
- EO pinpoints where water-scarcity pressures are greatest, guiding ADB planning for agriculture, water harvesting and food-security interventions.
- Insights strengthen rural resilience by helping institutions understand when and where communities face the highest risk of losing water sources.
- EO underpins evidence-based investments for sustainable water management, feeding into ADB’s Country Partnership Strategy and national planning processes.
- A web-based platform developed under this activity enhances uptake, enabling national agencies and partners to explore EO-derived water dynamics and integrate them into long-term strategies.
Read more about this GDA Water Resources case study in our blog.
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