THE GOVERNMENT OF THE PHILIPPINES THE DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS
The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in
the Republic of the Philippines JAPAN INTERNATIONAL COOPERATION AGENCY
Figure 3.2.6 Simulated Maximum Deposit by a 20-Year Probable Flood in the Sto. Tomas River
ALTERNATIVE1 Maximum Deposit
ALTERNATIVE2 Maximum Deposit
ALTERNATIVE3 Maximum Deposit
m
Mesh (1 mesh = 80 m)
Mesh
m
Mesh (1 mesh = 80 m)
Mesh
m
Mesh (1 mesh = 80 m)
Mesh
IV-F22
THE GOVERNMENT OF THE PHILIPPINES THE DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS
The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in
the Republic of the Philippines JAPAN INTERNATIONAL COOPERATION AGENCY
Figure 3.3.1 Longitudinal Profile and River Width of the Bucao River
Bucao River
-2,000
-1,000
0
1,000
2,000
-4 -2 0 2 4 6 8 10 12
Sta. km
Riv
erbe
d W
idth
(m)
Balin Baquero River
-2,000
-1,000
0
1,000
2,000
12 16 20 24
Upper Bucao River
-2,000
-1,000
0
1,000
2,000
12 16 20 24
Bucao Bridge (Sta. 0.0 km)
Baquilan River(Sta. 5.5 km)
Upper Bucao River(Sta. 12.0 km)
Balintawak River(Sta. 13.0 km)
River Mouth(Sta. -2.4 km)
Malumboy(Sta. 10.0 km)
0
20
40
60
80
100
120
140
160
180
200
-5.0 0.0 5.0 10.0 15.0 20.0 25.0
Sta.km
Low
est R
iver
bed
(El.
m)
Bucao-Balin Baquero River
Upper Bucao River
1/280 1/180 1/90 Upper Bucao
1/95 Balin BaqueroRiverbed Gradient
IV-F23
Sto. Tomas River
-1,500
-1,000
-500
0
500
1,000
1,500
-5.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0
Sta. km
Riv
erbe
d W
idth
(m)
River Mouth (Sta. -1.5 km)
Maculcol Bridge (Sta. 0.0 km)
Vega Hill (Sta. 10.5 km)
Santa Fe River (Sta. 11.5 km) Mapanuepe River
(Sta. 21.0 km)
Mt. Bagang (Sta. 21.5 km)
Paete Hill(Sta. 7.25 km)
0
50
100
150
200
250
300
-5.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0
Sta. km
Low
est R
iver
bed
(El.m
)
1/310 1/130 1/60
Riverbed Gradient
1/40
THE GOVERNMENT OF THE PHILIPPINES THE DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS
The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in
the Republic of the Philippines JAPAN INTERNATIONAL COOPERATION AGENCY
Figure 3.3.2 Longitudinal Profile and River Width of Sto. Tomas River
IV-F24
THE GOVERNMENT OF THE PHILIPPINES THE DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS
The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in
the Republic of the Philippines JAPAN INTERNATIONAL COOPERATION AGENCY
Figure 3.3.3 Flow Duration Curve and Annual Hydrograph Pattern for Simulation
Flow Duration Curve
0.00
4.00
8.00
12.00
0 50 100 150 200 250
Days / Year
Dai
ly D
isch
arge
[m3/
s]
Original Data
Stepwise Approximation
Average Pattern of 1963 and 1984 in Bucao River
0200400600800
Jan
Mar
May Ju
l
Sep
Nov
Q(m
3/s)
01,0002,0003,0004,000
Rai
nfal
l(mm
)
Bucao Q(m3/s) Iba-Rainfall(mm)
Stepwise Flow DurationQ/Qmean (%)
Days PointQ StepQ0 11.991 11.99 11.992 11.992 6.99
10 6.99 6.9915 6.9915 4.3120 4.31 4.3125 4.3125 2.8030 2.80 2.8040 2.8040 1.6750 1.67 1.6775 1.6775 0.96
100 0.96 0.96125 0.96125 0.66150 0.66 0.66175 0.66175 0.25200 0.25 0.25225 0.25225 0.17250 0.17 0.17275 0.17275 0.13365 0.13 0.13365 0.00
Annual Hydrograph Pattern
0
10
20
30
40
50
60
0 30 60 90 120 150 180 210 240 270 300 330 360
Days
Q/Q
mea
n
Normal YearFlood Year
IV-F25
Riverbed Change in Bucao - Balin Baquero River after 20 Years
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
-5.0 0.0 5.0 10.0 15.0 20.0 25.0
Sta. (km)
Cha
nge
of L
owes
t Riv
erbe
d El
evat
ion
(m)
Original in 2002Case 1 (No Flood in 20 Years)Case 2 (Flood in 5th Year)Case 3 (Flood in 15th Year)
Riverbed Movement in Bucao - Balin Baquero River after 20 Years
River Mouth(Sta. -2.4 km)
Baquilan River(Sta. 5.5 km)
Upper Bucao River(Sta. 12.0 km)
Bucao Bridge(Sta. 0.0 km)
Malumboy (Sta. 10.0 km)
0
50
100
150
200
-5.0 0.0 5.0 10.0 15.0 20.0 25.0
Sta. (km)
Low
est R
iver
bed
(El.m
)
Original in 2002
Case 1 (No Flood in 20 Years)Case 2 (Flood in 5th Year)Case 3 (Flood in 15th Year)
THE GOVERNMENT OF THE PHILIPPINES THE DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS
The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in
the Republic of the Philippines JAPAN INTERNATIONAL COOPERATION AGENCY
Figure 3.3.4
Simulated Riverbed Movement for 20 Years in the Bucao and Balin Baquero Rivers (Alternative-1)
IV-F26
Riverbed Movement in Upper Bucao River after 20 Years
Balin Baquero River(Sta. 12.0 km)
Balintawak River(Sta. 13.0 km)
0
50
100
150
-5.0 0.0 5.0 10.0 15.0 20.0 25.0Sta. (km)
Low
est R
iver
bed
(El.m
)
Original in 2002Case 1 (No Flood in 20 Years)Case 2 (Flood in 5th Year)Case 3 (Flood in 15th Year)
Riverbed Change in Upper Bucao River after 20 years
-20.0
-15.0
-10.0
-5.0
0.0
5.0
10.0
15.0
20.0
-5.0 0.0 5.0 10.0 15.0 20.0 25.0
Sta. (km)
Cha
nge
of L
owes
t Riv
erbe
d E
leva
tion
(m)
Original in 2002Case 1 (No Flood in 20 Years)Case 2 (Flood in 5th Year)Case 3 (Flood in 15th Year)
THE GOVERNMENT OF THE PHILIPPINES THE DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS
The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in
the Republic of the Philippines JAPAN INTERNATIONAL COOPERATION AGENCY
Figure 3.3.5 Simulated Riverbed Movement for 20 Years in the Upper Bucao River (Alternative-1)
IV-F27
Riverbed Movement for 20 Years in Bucao River (Alternative-1, Case-1)
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
-5.0 0.0 5.0 10.0 15.0 20.0 25.0
Sta. km
Cha
nge
of L
owes
t Riv
erbe
d (m
) after 20 yearsafter 10 yearsafter 5 yearsafter 1 yearOriginal in 2002
Riverbed Movement for 20 Years in Bucao River (Alternative-1, Case-2)
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
-5.0 0.0 5.0 10.0 15.0 20.0 25.0
Sta. km
Cha
nge
of L
owes
t Riv
erbe
d (m
)
Riverbed Movement for 20 Years in Bucao River (Alternative-1, Case-3)
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
-5.0 0.0 5.0 10.0 15.0 20.0 25.0
Sta. km
Cha
nge
of L
owes
t Riv
erbe
d (m
)
THE GOVERNMENT OF THE PHILIPPINES THE DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS
The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in
the Republic of the Philippines JAPAN INTERNATIONAL COOPERATION AGENCY
Figure 3.3.6 Chronological Riverbed Change for 20 Years in the Bucao River (Alternative-1)
IV-F28
Riverbed Change in the Bucao - Balin Baquero River after 50 Years(Alternative-1)
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
1.0
-5.0 0.0 5.0 10.0 15.0 20.0 25.0
Sta. km
Cha
nge
of L
owes
t Riv
erbe
d (m
)
after 50 yearsafter 40 Yearsafter 30 Yearsafter 20 years (Initial)
Riverbed Movement in the Bucao - Balin Baquero River after 50 Years(Alternative-1)
River Mouth(Sta. -2.4 km)
Bucao Bridge(Sta. 0.0 km)
Malomboy(Sta. 10.0 km)
Upper Bucao River(Sta. 12.0 km)
Baquilan River(Sta. 5.5 km)
0
50
100
150
200
-5.0 0.0 5.0 10.0 15.0 20.0 25.0
Sta. km
Riv
erbe
d (E
l.m)
after 20 Years (Initial)after 30 Yearsafter 40 Yearsafter 50 YearsAverage Riverbed in 1977
THE GOVERNMENT OF THE PHILIPPINES THE DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS
The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in
the Republic of the Philippines JAPAN INTERNATIONAL COOPERATION AGENCY
Figure 3.3.7
Simulated Riverbed Movement for 50 Years in the Bucao and Balin Baquero Rivers (Alternative-1)
IV-F29
Riverbed Change in the Upper Bucao River after 50 Years (Alternative-1)
-10.0
-8.0
-6.0
-4.0
-2.0
0.0
2.0
-5.0 0.0 5.0 10.0 15.0 20.0 25.0
Sta. km
Cha
nge
of L
owes
t Riv
erbe
d (m
)
after 20 Years (Initial)after 30 Yearsafter 40 Yearsafter 50 Years
Riverbed Movement in the Upper Bucao River after 50 Years (Alternative-1)
Balin Baquero River (Sta. 12.0 km)
Balintawak River(Sta. 13.0 km)
50
100
150
-5.0 0.0 5.0 10.0 15.0 20.0 25.0
Sta. km
Riv
erbe
d (E
l.m)
after 20 Years (Initial)after 30 Yearsafter 40 Yearsafter 50 YearsAverage Riverbed in 1977
THE GOVERNMENT OF THE PHILIPPINES THE DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS
The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in
the Republic of the Philippines JAPAN INTERNATIONAL COOPERATION AGENCY
Figure 3.3.8 Simulated Riverbed Movement for 50 Years in the Upper Bucao River (Alternative-1)
IV-F30
Riverbed Change in the Sto. Tomas River after 20 years (Alternative-1)
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
1.0
2.0
-5.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0
Sta. km
Cha
nge
of L
owes
t Riv
erbe
d El
evat
ion
(m)
Original in 2002Case 1 (No Flood in 20 Years)Case 2 (Flood in 5th Year)Case 3 (Flood in 15th Year)
Riverbed Movement in the Sto. Tomas River after 20 Years (Alternative-1)
River Mouth(Sta. -1.5 km)
Maculcol Bridge(Sta. 0.0 km)
Vega Hill(Sta. 10.5 km)
Santa Fe River (Sta. 11.5 km) Mapanuepe River
(Sta. 21.0 km)
Mt. Bagang(Sta. 21.5 km)
0
50
100
150
200
250
300
-5.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0
Sta. km
Low
est R
iver
bed
(El.m
)
Original in 2002
Case 1 (No Flood in 20 Years)
Case 2 (Flood in 5th Year)
Case 3 (Flood in 15th Year)
THE GOVERNMENT OF THE PHILIPPINES THE DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS
The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in
the Republic of the Philippines JAPAN INTERNATIONAL COOPERATION AGENCY
Figure 3.3.9 Simulated Riverbed Movement for 20 Years in the Sto. Tomas River (Alternative-1)
IV-F31
Riverbed Movement in the Sto. Tomas River after 20 Years (Alternative-2)
River Mouth (Sta. -1.5 km)
Maculcol Bridge(Sta. 0.0 km)
Vega Hill(Sta. 10.5 km)
Santa Fe River (Sta. 11.5 km) Mapanuepe River
(Sta. 21.0 km)
Mt. Bagang(Sta. 21.5 km)
Training Channel(Sta. 21.5 km - 25.5 km)
0
50
100
150
200
250
300
-5.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0
Sta. km
Low
est R
iver
bed
(El.m
)
Original in 2002
Case 1 (No Flood in 20 Years)
Case 2 (Flood in 5th Year)
Case 3 (Flood in 15th Year)
Riverbed Change in the Sto. Tomas River after 20 years (Alternative-2)
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
1.0
2.0
-5.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0
Sta. km
Cha
nge
of L
owes
t Riv
erbe
d El
evat
ion
(m)
Original in 2002Case 1 (No Flood in 20 Years)Case 2 (Flood in 5th Year)Case 3 (Flood in 15th Year)Alt-1 Case-1
Training Channel(Sta. 21.5 km- Sta. 25.5 km)
THE GOVERNMENT OF THE PHILIPPINES THE DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS
The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in
the Republic of the Philippines JAPAN INTERNATIONAL COOPERATION AGENCY
Figure 3.3.10 Simulated Riverbed Movement for 20 Years in the Sto. Tomas River (Alternative-2)
IV-F32
Riverbed Movement in the Sto. Tomas River after 20 Years (Alternative-3)
River Mouth (Sta. -1.5 km)
Maculcol Bridge (Sta. 0.0 km)
Vega Hill (Sta. 10.5 km)
Santa Fe River (Sta. 11.5 km) Mapanuepe River
(Sta. 21.0 km)
Mt. Bagang(Sta. 21.5 km)
Consolidation Dam (Sta. 21.5 km)
0
50
100
150
200
250
300
-5.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0
Sta. km
Low
est R
iver
bed
(El.m
)
Original in 2002
Case 1 (No Flood in 20 Years)
Case 2 (Flood in 5th Year)
Case 3 (Flood in 15th Year)
Riverbed Change in the Sto. Tomas River after 20 Years (Alternative-3)
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
1.0
2.0
-5.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0
Sta. km
Cha
nge
of L
owes
t Riv
erbe
d El
evat
ion
(m)
Original in 2002Case 1 (No Flood in 20 Years)Case 2 (Flood in 5th Year)Case 3 (Flood in 15th Year)Alt-1 Case-1
Consolidation Dam(Sta. 21.5 km)
THE GOVERNMENT OF THE PHILIPPINES THE DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS
The Study on Sabo and Flood Control for Western River Basins of Mount Pinatubo in
the Republic of the Philippines JAPAN INTERNATIONAL COOPERATION AGENCY
Figure 3.3.11 Simulated Riverbed Movement for 20 Years in the Sto. Tomas River (Alternative-3)
IV-F33