Local Flood Early Warning Systems Supported by Satellite Technologies German Technical Cooperation, Philippines 10 September 2009 (revised version 26 Sept.

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

18.04.23 Page 2Olaf Neussner

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


CC-susceptible hazards are responsible for 90% of the damage in the Philippines.


The number and percentage of stronger storms appears to be increasing

P. J. Webster et al., Science 309, 1844 -1846 (2005)



Typhoon Hazard (MunichRe)


Binahaan Watershed

18.04.23 Page 8Olaf Neussner 18.04.23

Land Cover Map of Leyte

Combined images from• SPOT5• ASTER• LANDSATResolution from 10-29m,Different spectral bands.


Land Use in Flood Prone Area ofBinahaan Watershed (SPOT5, ASTER)(Total: 6,446ha)

Land Use Classification


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.


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



Performance of LFEWS

In Operation since 2 years.

No false alarms.

No missed Floods.

13 times activated.

Majority of interviewees satisfied.


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


THANK YOU

This project is supported by: In cooperation with:

Local Flood Early Warning Systems Supported by Satellite Technologies German Technical Cooperation, Philippines 10 September 2009 (revised version 26 Sept.

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