lesson 1 water resources in the philippines.pdf
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Philippine Water Resources
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LESSON 1 Introduction to Water ResourcesEngineering
Water Resources
Region in the RP Source : 1972 National Economic Atlas
Land Area : 300,000 km
Annual Average Rainfall : 2,400 mm
The Philippine has
12 Water Resources Regions
421 principal river basins
20 major river basins
72 lakes
Coastal bays and coastal
waters 266,000 km
Source : NWRB, 2009
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LESSON 1 Introduction to Water ResourcesEngineering
Water Resources Region
Groundwater
Potential
Surface Water
Potential
Total Water
Resources Potential
X Northern Mindanao 2116 29000 31116
XII Southern Mindanao 1758 18700 20458
VI Western Visayas 1144 14200 15344
XI Southeastern Mindanao 2375 11300 13675
IX Western Mindanao 1082 12100 13182
VIII Eastern Visayas 2557 9350 11907
II Cagayan Valley 2825 8510 11335
III Central Luzon 1721 7890 9611
IV Southern Tagalog 1410 6370 7780
I Ilocos 1248 3250 4498
V Bicol 1085 3080 4145
VII Central Visayas 879 2060 2939
TOTAL 20,200 125790 145990
How much water do we have?Table 1. Water Availability, in MCM Source : Philippine Environment Monitor, 2003
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LESSON 1 Introduction to Water ResourcesEngineering
Major River
Basins in the
Philippines
Source : EMB, 2007
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Table 2. Location and Drainage Area of the
Major River Basins in the Philippines
LESSON 1 Introduction to Water ResourcesEngineering
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LESSON 1 Introduction to Water ResourcesEngineering
Rainfall in the
Philippines for
the Month of
May 2011
a. Normal Rainfall (mm)
Source PAGASA, 2011
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LESSON 1 Introduction to Water ResourcesEngineering
Rainfall in the
Philippines for
the Month of
May 2011
b. Actual Rainfall (mm)
Source PAGASA, 2011
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LESSON 1 Introduction to Water ResourcesEngineering
Rainfall in the
Philippines for
the Month of
May 2011
c. Percent of Rainfall (mm)
Source PAGASA, 2011
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LESSON 1 Introduction to Water ResourcesEngineering
How many Tropical Cyclones do we have?
On the average, 19 tropical cyclones enter the Philippines Area of
Responsibility (PAR)
About 8 9 TC cross the Philippines
At least 1 TC per year may not make its landfall but still inflict damage
and casualties in the country
June to December may be considered typhoon season, with its peak
during the months of July and August
Most of the destructive and deadly typhoons usually occur during thelatter part of the season, notably, September, October and
November, when TC generally move to the eastern coastal
seaboard of the country