THE GOVERNMENT OF THE PHILIPPINES THE DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS Figure 2.1.5 The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in Sto. Tomas River Inundation Hazard Map the Republic of the Philippines (Probability 100 Years) JAPAN INTERNATIONAL COOPERATION AGENCY XIV-F9 ST Tomas River Inundation Analysis Result Probable Damage Return Hazard House Road(km) Agriculture Period(years) Area(km2) (Number) National Others Total Field 2 39.85 3782 4.13 166.19 170.32 23.87 5 48.49 5045 4.91 218.63 223.55 28.62 10 53.95 5762 5.54 247.89 253.43 31.75 20 58.94 6444 6.02 273.75 279.77 34.65 30 62.20 6832 6.26 289.54 295.79 36.56 50 65.89 7296 6.91 307.53 314.44 38.68 100 71.04 8079 7.62 333.84 341.46 41.68 ST Tomas River 80.00 70.00 60.00 50.00 40.00 30.00 20.00 Hazard Area(km2) Hazard Area (km2) 10.00 Agriculture Field (km2) 0.00 0 20406080100 Return Period (years) ST Tomas River 400.00 350.00 300.00 250.00 200.00 National 150.00 Others 100.00 Total Length RoadHazard (km) 50.00 0.00 0 20406080100 Return Period (years) ST Tomas River 9000 8000 7000 6000 5000 4000 3000 2000 House (Number) HouseHazard (Number) 1000 0 0 20406080100 Return Period (years) THE GOVERNMENT OF THE PHILIPPINES THE DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS Figure 2.1.6 The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in Result of Inundation Analysis (Sto. Tomas the Republic of the Philippines River) JAPAN INTERNATIONAL COOPERATION AGENCY XIV-F10 THE GOVERNMENT OF THE PHILIPPINES THE DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS Figure 2.1.7 The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in Land Use Condition from 1990 to 2001 the Republic of the Philippines JAPAN INTERNATIONAL COOPERATION AGENCY XIV-F11 Forest Area Unit:km2 1990 1992 1993 2001 Forest Area Iba 28.2 67.1 66.5 32.4 Botolan 205.6 135.1 166.5 197.9 250.0 Cabangan 21.5 44.0 66.7 52.1 Iba San Marcelino 152.2 127.6 151.9 164.6 200.0 Botolan Castillejos 35.2 30.6 Cabangan 150.0 San Felipe 2.9 10.5 22.2 29.3 San Marcelino Km2 Castillejos San Narciso 0.9 4.2 8.6 9.8 100.0 San Antonio 0.4 11.8 23.7 24.6 San Felipe San Narciso Total 411.7 400.3 541.2 541.2 50.0 S an Antonio 0.0 1990 1992 1993 2001 Years Cultivated area Unit:km2 Cultivated Area 1990 1992 1993 2001 Iba 28.1 3.4 16.8 58.0 120.0 Botolan 69.4 44.0 63.3 105.3 100.0 Iba Cabangan 32.5 24.2 22.6 33.3 Botolan San Marcelino 25.1 51.1 49.4 58.2 80.0 Ca banga n Castillejos 22.5 33.5 San Marcelino 60.0 Ca stillejo s San Felipe 19.0 16.2 24.4 32.8 Km2 San Narciso 28.8 16.5 31.2 34.2 40.0 San Felipe San Antonio 16.5 20.1 24.5 37.4 San Narciso 20.0 San Antonio Total 219.5 175.6 254.7 392.6 0.0 1990 1992 1993 2001 Years Grass+Bare land Unit:km2 Grass & BareLand Area 1990 1992 1993 2001 Iba 106.8 31.6 69.6 35.6 450.0 Botolan 413.8 161.6 208.9 175.3 400.0 Iba Cabangan 118.9 109.1 81.6 67.4 350.0 Botolan San Marcelino 179.8 135.6 102.7 58.2 300.0 Ca banga n Castillejos 33.9 22.6 250.0 San Marcelino Ca stillejo s San Felipe 97.9 93.6 67.3 38.3 Km2 200.0 San Narciso 44.3 59.2 28.4 15.9 150.0 San Felipe San Antonio 92.5 89.9 62.6 30.5 100.0 San Narciso Total 1054.1 680.7 655.2 443.8 50.0 San Antonio 0.0 1990 1992 1993 2001 Years Lahar flow deposit Unit:km2 Lahar flow deposit Area 1990 1992 1993 2001 Iba 0.0 0.0 0.4 4.9 70.0 Botolan 6.9 56.5 53.2 60.2 60.0 Iba Cabangan 0.0 2.7 2.1 2.3 Botolan San Marcelino 8.4 32.8 31.0 37.5 50.0 Ca banga n Castillejos 2.1 1.0 40.0 San Marcelino Km2 Ca stillejo s San Felipe 0.4 8.9 4.1 4.8 30.0 San Felipe San Narciso 1.1 9.9 5.0 5.8 20.0 San Antonio 0.0 0.3 0.0 0.3 San Narciso Total 16.9 111.0 98.0 116.7 10.0 San Antonio 0.0 1990 1992 1993 2001 Years Pyroclastic flow deposit Unit:km2 Pyroclastic flow deposit Area 1990 1992 1993 2001 Iba 0.0 0.0 0.0 0.4 250.0 Botolan 0.0 202.2 189.0 82.6 Iba 200.0 Cabangan 0.0 0.0 0.0 2.2 Botolan San Marcelino 0.0 34.6 18.8 12.8 Ca banga n 150.0 Castillejos 0.0 0.5 San Marcelino San Felipe 0.0 0.0 0.0 0.9 Km2 Ca stillejo s 100.0 San Narciso 0.0 0.0 0.0 0.0 San Felipe San Narciso San Antonio 0.0 0.0 0.0 1.8 50.0 San Antonio Total 0.0 236.8 207.9 101.3 0.0 1990 1992 1993 2001 Years THE GOVERNMENT OF THE PHILIPPINES THE DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS Figure 2.1.8 The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in Trend of Land Use Condition from 1991 to 2002 the Republic of the Philippines JAPAN INTERNATIONAL COOPERATION AGENCY XIV-F12 Plain/Total Are a Farm La nd(ha) % of HH s S erve d Directly Farmla nd/po p Po p/Area(Number/ha) Ro ad(car) FarmLa nd/Total Are a FarmLan d/Total Are a IRA/Area Po pulation(To tal year2 001) Build -up area/Total Are a Plain/Total Are a % of Schoo l childre n % of HHs Served Directly Farmla nd/po p % of Schoo l childre n Farm L and(ha) Tota l Area(ha) IR A / po p Mountain/Total Area Road(car) Distance to Pob(min) P opulation(To tal year2 001) IR A / po p Tota l Area(ha) Po p/Are a(Number/ha) Distance to Pob(min) Build -up are a/Total Are a Mountain/Total Area IRA/Area -0.5 -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4 0.5 -0.5 -0.4 -0. 3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4 0.5 the Principal Component 1 the Principal Component 2 Population(To tal year2 001 ) % of Schoo l childre n Road(car) IR A / po p % of HHs Served Directly Farmla nd/po p Po p/Area(Number/ha ) Farm La nd(ha) Build -up area/Total Area Ro ad(car) Tota l Area(ha ) IRA/Area Farm L and(ha ) Build -up are a/Total Are a IRA/Area Mountain/Total Area % of Scho ol ch ildren Distance to Pob(min) Mou ntain/Total Area Po p/Are a(Number/ha) Plain/Total Are a Tota l Area(ha) Farmla nd/p op Plain/Total Are a Distance to Pob(min) FarmLan d/Total Are a IRA/pop Po pulation(To tal year2 001) FarmLa nd/Total Are a % of HHs Served Directly -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0. 3 0.4 0.5 0.6 0.7 -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4 0.5 0.6 the Principal Component 3 the Principal Component 4 % of Scho ol ch ildren IR A / po p Population(To tal year2 001 ) % of HHs Served Directly Mou ntain/Total Area Ro ad(car) Plain/Total Are a Mountain/Total Area IRA/pop Po pulation(To tal year2 001) Road(car) IRA/Area FarmLa nd/Total Are a Farmla nd/po p % of HHs Served Directly Plain/Total Are a Po p/Area(Number/ha ) Build -up are a/Total Are a Distance to Pob(min) Tota l Area(ha) Build -up area/Total Area Farm La nd(ha) IRA/Area % of Schoo l childre n Farm L and(ha ) Distance to Pob(min) Farmla nd/p op FarmLan d/Total Are a Tota l Area(ha ) Po p/Are a(Number/ha) -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 -0.4 -0.2 0.0 0.2 0.4 0. 6 0.8 the Principal Component 5 the Principal Component 6 THE GOVERNMENT OF THE PHILIPPINES THE DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS Figure 2.2.1 The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in Vector of Each Principal Component (1/2) the Republic of the Philippines JAPAN INTERNATIONAL COOPERATION AGENCY XIV-F13 the Principal the Principal Component 1 Component 1 0.5 0.5 P lain/To Plain/To 0.4 0.4 0.3 0.3 Pop/Area % of HHs Fa rmL and Fa rmLand Pop/Area% of HH s IRA/Area IRA/Area Bu ild-up B uild-up 0.2 0.2 % of Sch Farmland Fa rm lan d % o f Sch 0.1 0.1 IRA/ pop Far m L an IRA/pop Farm Lan 0.0 Ro ad(car 0.0 Road(car -0.1 Po pulati -0 .1 Populati -0.2 -0 .2 -0.3 -0 .3 Tota l Ar To tal Ar Distance Distance -0.4 -0 .4 Moun tain Mo untain -0.5 -0 .5 -0.5 -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.