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Puerto Galera Puerto Galera Watersheds Watersheds • Increasing population Tourism boom • Increased demand for resources ( e.g. land, water, food) Land use / cover change More wastes generated

Puerto Galera Watersheds

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Page 1: Puerto Galera Watersheds

Puerto Galera WatershedsPuerto Galera Watersheds

• Increasing population• Tourism boom

• Increased demand for resources ( e.g. land, water, food)

• Land use / cover change

• More wastes generated

Page 2: Puerto Galera Watersheds

How can watershed How can watershed modeling help modeling help Puerto Galera?Puerto Galera?

• Assessing water supply potential

• Quantifying material fluxes, also from built-up areas

• Assessing the effect of clear-cutting and deforestation

• Evaluating risk of flash flooding

White Beach

forest 2005deforested 2005 (from 2001)

Page 3: Puerto Galera Watersheds

Puerto Galera Watersheds

Balatero Balatero watershedwatershed

Aninuan Aninuan watershedwatershed

SRTM 3” DEM

Page 4: Puerto Galera Watersheds

Balatero WatershedBalatero Watershed

Present Land Cover

21798, 9%

155513.5,63%

67975.6,28%

All Forest

153380.5, 63%

58932.5, 24%

33017, 13%Interception

Infiltration

Discharge

All Bare

0, 0%

143191.9, 58%

102070.9, 42%

Present LCPresent LC All ForestAll ForestAll BareAll Bare

Page 5: Puerto Galera Watersheds

Balatero WatershedBalatero Watershed Hydrographs

0

5

10

15

20

25

0 50 100 150 200 250 300 350 400

minutes

cms

All Forest

All Bare

Present Land Cover

Present LC

Rapid increase in stream dischargeHigh peak discharge

All ForestAll Bare

Gradual increase/decrease

in stream discharge

More gradual increase/decrease in stream dischargeLow peak discharge

Page 6: Puerto Galera Watersheds

Aninuan WatershedAninuan Watershed

All Forest92719.4,

24%

210190.2,54%

83046.3,22%

All Bare

0, 0%

222042.7,58%

163805.8,42%

Interception

Infiltration

Discharge

Aninuan Watershed Hydrographs

0

5

10

15

20

25

30

35

40

0 50 100 150 200 250

minutes

cms

All ForestAll Bare

Aninuan Watershed

Aninuan Watershed

Anin

uan

Wat

ersh

edAn

inua

n W

ater

shed

All BareAll Bare All ForestAll Forest

Page 7: Puerto Galera Watersheds

Conclusions

• Long-term continuous monitoring reveals discharge dynamics not adequately captured by intermittent grab sampling

• Land cover composition and landscape patterns have significant influence on river/stream discharge

• Watershed modeling is a useful tool for understanding effects of land cover change, among other factors, and hence for supporting decision-making in a coastal environment.

Page 8: Puerto Galera Watersheds

Maraming salamat po!Maraming salamat po!