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Local Flood Early Warning Systems
Supported by
Satellite Technologies
German Technical Cooperation, Philippines
10 September 2009 (revised version 26 Sept. 2009)
By Olaf Neussner
18.04.23 Seite 1
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Content
- Introduction: Disasters and Climate Change in the Philippines
- Land Use in Flood-Prone Areas
- Structure of a Local Flood Early Warning System
- Performance of the LFEWS
- Next Steps
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CC-susceptible hazards are responsible for 90% of the damage in the Philippines.
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The number and percentage of stronger storms appears to be increasing
P. J. Webster et al., Science 309, 1844 -1846 (2005)
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Typhoon Hazard (MunichRe)
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Binahaan Watershed
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Land Cover Map of Leyte
Combined images from• SPOT5• ASTER• LANDSATResolution from 10-29m,Different spectral bands.
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Land Use in Flood Prone Area ofBinahaan Watershed (SPOT5, ASTER)(Total: 6,446ha)
Land Use Classification
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Class NameVulnerability
(1m Flood, 2days)
Value/hectar [Pesos]
(2007 prices)
HAMax. loss per Flood
[Pesos]
Closed Forest 0% 500,000 1,252.25 0.00
Mangrove Forest 0% 250,000 4.25 0.00
Shrubs 0% 5,000 145.38 0.00
Barren Land 0% 0 23.49 0.00
Annual Crop 50% 30,500 2,731.27 41,651,868
Perennial Crop 20% 61,700 1,874.02 23,125,407
Pastures 0% 0 87.74 0.00
Inland Water 0% 0 244.77 0.00
Settlements (Floor area) 5% 75,000,000 82.80(9.1) (22,202,006)
Floor area in other areas 5% 75,000,000 59,022,200
Total 6,445.97 146,001,481
Loss Estimations
(3.1 Mill. US$)There are scattered buildings in the non-settlement areas. They are accounted for in the last row.
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Tropical Rainfall Monitoring Mission Data for Flood Forecasting
Cumulative Rainfall Comparison
0.0
1000.0
2000.0
3000.0
4000.0
5000.0
6000.0
7000.0
J F M A M J J A S O N D
Year 2008
Rain
(m
m)
3B42V6
GAUGEData every 3 hours in the internet
Binahaan Flood Early Warning System
Pastrana
Dagami
Palo
Tanauan
Flood-prone Area
Binahaan Watershed
Operation Center
Warning to Munic ipality
ng
Wa rning to Municipality
Warning to Baranga y
Wa rning toBa ra nga y
Evac
uat io
n
Evacuation
3 Warning LevelsAlertStand by
Preparation
Evacuation
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Performance of LFEWS
In Operation since 2 years.
No false alarms.
No missed Floods.
13 times activated.
Majority of interviewees satisfied.
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Next Steps
•Utilization of land use map for vulnerability assessment for different hazards
•Improve correlation of satellite-based precipitation data with ground data
•Use DEMs and other data for flood modelling
•Land use map/hazard maps for Disaster Risk Management sensitive spatial planning
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THANK YOU
This project is supported by: In cooperation with:
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