THE STUDY ON Fig. 2.5 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Flow Capacity of Rivers in the Study Area CTI Engineering International Co., Ltd (in Present Land Use Condition) Nippon Koei Co., Ltd F - 2 - 7
(Source: JICA Study Team) Reference: “CAVITE (No. 3163 II)”, “SILANG (No.3162 I)” and “MENDEZ-NUNEZ (No.3162 II)” published by published by MGS in 1982, and “CAVITE WATER SUPPLY DEVELOPMENT STUDY” conducted by JICA in 1995 (JICA, 1995) Note: Although the Taal Tuff (upper) is unexpressed on the geological map except for Tagaytay area, it is extensively and thinly distributed on almost all of the Study Area.
THE STUDY ON Fig. 2.6 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA CTI Engineering International Co., Ltd. Geological Map of Study Area Nippon Koei Co., Ltd
F - 2 - 8 Division Upland General Hilly Area Lowland Area Mountainous Area
Extremely Lowland Area
Schematic River Cross Section
(m) Tagaytay 600
Taal Tuff (upper)
400 Amadeo
Taal Tuff (lower) Silang
Groundwater surface 200 Trece Martires City Dasmarinas Rosario Bacoor NIA Irrigation Guadulupe Formation Canal Guadulupe Alluvium (lower) Formation Imus 0 (upper) 0 10 20 30 40 Taal Lake (km) Schematic Geological Profile
Upland General Hilly Extremely Division Lowland Area Mountain Area Area Lowland Area 1.Elevation (m) More than 400 30-400 2-30 Less than 2 2. Ground slope (%) More than 2 0.5-2 Less than 0.5 Almost flat 3.Topographic feature of Major Rivers Width of riverbed Little Medium Large Large Height of riverbank Low High Medium Medium 4. Geology Top layer Taal Tuff (upper) Taal Tuff (upper) Taal Tuff (upper) Alluvium Very soft Very soft Very soft loose Riverbed/Riverbank Taal Tuff (upper) Taal Tuff (lower) Guadalupe F. (upper) Guadalupe F. (upper) Very soft Moderately hard Moderately hard Moderately hard 5.Groundwater surface Low-medium Low-medium High High
(Source: JICA Study Team)
Reference: “CAVITE (No. 3163 II)”, “SILANG (No.3162 I)” and “MENDEZ-NUNEZ (No.3162 II)” published by published by MGS in 1982, and “CAVITE WATER SUPPLY DEVELOPMENT STUDY” conducted by JICA in 1995
THE STUDY ON Fig. 2.7 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Schematic Geological Profile and CTI Engineering International Co., Ltd. Cross Section of Study Area Nippon Koei Co., Ltd
F - 2 - 9
COMPREHENSIVE FLOOD MITIGATION FLOOD COMPREHENSIVE
CTI EngineeringInternational Co., Ltd. FOR CAVITE LOWLAND AREA Nippon Koei Co., Ltd THE STUDY ON F -210 Fig. 2.8
Regional Geology Pisolite (grey spots in this photograph) included in tuffaceous sandstone
THE STUDY ON Fig. 3.1 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA CTI Engineering International Co., Ltd. Existing Land Use in the Study Area Nippon Koei Co., Ltd
F - 3 - 1
THE STUDY ON Fig. 4.1 COMPREHENSIVE FLOOD MITIGATION
FOR CAVITE LOWLAND AREA CTI Engineering International Co., Ltd. Future land Use Plan Projected by City/Municipalities Nippon Koei Co., Ltd
F - 4 - 1 THE STUDY ON Fig. 4.2 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Proposed Land Use Plan CTI Engineering International Co., Ltd. Nippon Koei Co., Ltd
F - 4 - 2
Soil Analysis Map: more than 15%, (NAMRIA) SAFDS Map (Office of the Provincial Agriculturist)
CARP Map (Agrarian Reform Office) NIA Map (National Irrigation Administration, Naic)
THE STUDY ON Fig. 4.3 (1/2) COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA CTI Engineering International Co., Ltd. Area not Suitable for Future Built-up Area Nippon Koei Co., Ltd
F - 4 - 3
Inundation Map 2-yr, (JICA Study Team)
Map of Area not Suitable for Urban Use NIA Map (Overlay of above information) (National Irrigation Administration, Naic)
THE STUDY ON Fig. 4.3 (2/2) COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Area not Suitable for Future Built-up Area CTI Engineering International Co., Ltd. Nippon Koei Co., Ltd
F - 4 - 4
THE STUDY ON Fig. 4.4 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Principal Concept of Urbanization in the Study Area CTI Engineering International Co., Ltd. Nippon Koei Co., Ltd F - 4 - 5 Data Collection Field Inspection Flood Damage Survey
Rainfall Analysis
Runoff Analysis
Design Safety Level
Basic Flood Discharge
Flood Inundation Analysis (Reproduction)
Design of Control Flood Control yes Facility
No
Design Flood Discharge Flood Control Plan
River Channel Plan
Flood Inundation Analysis (Simulation)
Flood Mitigation Plan
THE STUDY ON Fig. 5.1 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Flowchart of Hydrological Analysis CTI Engineering International Co., Ltd. Nippon Koei Co., Ltd F - 5 - 1 N Port Area
Manila Bay
0 2 4 10 km
Sangley Point
Mabolo
Laguna de Bay
Alapan
S a n
J I u m a n u San Pedro s R R i v i Panaysayan e v r e r
P a n a y s a y a C n
a R n i v a Y e s l r a R n i g v
e Y r l a n g
R i v e r
Legend : Study Area : River Amadeo : Rainfall Gauging Station (Existing) : Rainfall Gauging Station (Closed) : Streamflow Gauging Station (Existing) Tagaytay : Streamflow Gauging Station (Abandoned)
Ambulong Taal Lake
THE STUDY ON Fig. 5.2 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Location of Rainfall and Streamflow Gauging Stations CTI Engineering International Co., Ltd. Nippon Koei Co., Ltd. F - 5 - 2 Typhoon Reming in October 2000 Typhoon Gloria in July 2002
40 40 ) 30 30
20 20
10 10 Rainfall Intensity (mm/hr) Intensity Rainfall Rainfall IntensityRainfall (mm/hr
0 0 02:00 08:00 14:00 20:00 02:00 08:00 14:00 20:00 02:00 08:00 14:00 20:00 02:00 08:00 14:00 20:00 02:00 08:00 14:00 20:00 02:00 08:00 14:00 20:00 2000/10/27 2000/10/28 2000/10/29 2002/7/5 2002/7/6 2002/7/7
Philippine Standard Time (PST) PST
Typhoon Inday in July 2002 Typhoon Milenyo in September 2006
40 40
30 30
20 20
10 10 Rainfall Intensity (mm/hr) Rainfall Intensity (mm/hr)
0 0 02:00 08:00 14:00 20:00 02:00 08:00 14:00 20:00 02:00 08:00 14:00 20:00 02:00 08:00 14:00 20:00 02:00 08:00 14:00 20:00 2002/7/12 2002/7/13 2002/7/14 2006/9/27 2006/9/28
PST PST
THE STUDY ON Fig. 5.3 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Hyetograph at Sangley Point Station during Four Typhoons in 2000, 2002 and 2006 CTI Engineering International Co., Ltd. Nippon Koei Co., Ltd. F - 5 - 3 Sangley Point (242.4 mm) Sangley Point (251.6 mm)
Mabolo (255.2 mm) Mabolo (247.2 mm)
Tagaytay (165.0 mm) Tagaytay (missing) Ambulong (227.1 mm) Ambulong (98.2 mm)
28-29 Oct. 2000 05-06 Jul. 2002 (Typhoon Reming) (Typhoon Gloria)
Sangley Point (139.4 mm) Sangley Point (407.2 mm)
Mabolo (172.6 mm) Mabolo (341.0 mm)
< 100 mm 100 - 200 mm
200 - 300 mm
300 - 400 mm
> 400 mm
Tagaytay (291.4 mm) Tagaytay (121.2 mm) Ambulong (196.2 mm) Ambulong (61.6 mm)
12-13 Jul. 2002 27-28 Sep. 2006 (Typhoon Inday) (Typhoon Milenyo)
THE STUDY ON Fig. 5.4 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Distribution of 2-day Rainfall during Four Typhoons in 2000, 2002 and 2006 CTI Engineering International Co., Ltd. Nippon Koei Co., Ltd. F - 5 - 4 10,000 99.99 Plotting Method: Cunnane
1,000 99.9
100 99 50 98
20 95
10 90
5 80
2 50 Return Period (Year) Return Period Non-Exceedence Probability (%) Non-Exceedence 1.25 20
1.11 10 Sample 1.05 Gumbel 5 Log-Pearson III 1.02 2 Iwai 1.01 1
1.001 0.1 0 50 100 150 200 250 300 350 400 450 500 Rainfall (mm)
(Unit: mm) Return Period Gumbel Log-Pearson III Iwai (year) 2 184 191 188 3 216 224 221 5 251 258 255 10 296 295 296 20 339 326 333 30 363 342 353 50 394 360 378 80 422 376 400 100 436 383 411 150 460 395 430 200 477 404 443 Correlation 0.970 0.987 0.981
THE STUDY ON Fig. 5.5 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Results of Frequency Analysis on Basin Mean 2-day Rainfall CTI Engineering International Co., Ltd. Nippon Koei Co., Ltd. F - 5 - 5 2-year Return Period 3-year Return Period 100 100
r 80 r 80
60 60
40 40 Rainfall (mm/h Rainfall Rainfall (mm/h 20 20
0 0 0 4 8 12162024283236404448 0 4 8 12162024283236404448 T (hour) T (hour)
5-year Return Period 10-year Return Period 100 100
r 80
r 80
60 60
40 40 Rainfall (mm/h Rainfall 20 (mm/h Rainfall 20
0 0 0 4 8 12162024283236404448 0 4 8 12162024283236404448 T (hour) T (hour)
20-year Return Period 30-year Return Period 100 100
r) 80 r) 80
60 60
40 40
Rainfall (mm/h 20 Rainfall (mm/h 20
0 0 0 4 8 12 16 20 24 28 32 36 40 44 48 0 4 8 12162024283236404448 T (hour) T (hour)
50-year Return Period 100-year Return Period 100 100
r 80 r) 80
60 60
40 40 Rainfall (mm/h Rainfall 20 Rainfall (mm/h 20
0 0 0 4 8 12162024283236404448 0 4 8 12162024283236404448 T (hour) T (hour)
THE STUDY ON Fig. 5.6 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Design Storm of Long Duration Rainfall CTI Engineering International Co., Ltd. Nippon Koei Co., Ltd. F - 5 - 6 2-year Return Period 3-year Return Period
30 30 25 25 20 20 15 15 10 10 Rainfall (mm) Rainfall 5 (mm) Rainfall 5 0 0 0 20 40 60 80 100 120 0 20 40 60 80 100 120 T (min) T (min)
5-year Return Period 10-year Return Period
30 30 25 25 20 20 15 15 10 10
Rainfall (mm) Rainfall 5 (mm) Rainfall 5 0 0 0 20 40 60 80 100 120 0 20 40 60 80 100 120 T (min) T (min)
20-year Return Period 30-year Return Period
30 30 25 25 20 20 15 15 10 10 Rainfall (mm) 5 (mm) Rainfall 5 0 0 0 20 40 60 80 100 120 0 20 40 60 80 100 120 T (min) T (min)
50-year Return Period 100-year Return Period
30 30 25 25 20 20 15 15 10 10
Rainfall (mm) 5
Rainfall (mm) Rainfall 5 0 0 0 20406080100120 0 20 40 60 80 100 120 T (min) T (min)
THE STUDY ON Fig. 5.7 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Design Storm of Short Duration Rainfall CTI Engineering International Co., Ltd. Nippon Koei Co., Ltd. F - 5 - 7 IM-11 BC-05 SJ-10L SJ-10R BC-03
IM-10 BC- SJ-07 SJ-09 04 IM- BC-02 06 IM-09 SJ- YY-06 08L IM-08
SJ-08R CN-12 SJ-06 BC-01 YY-04
NIA Irrigation Canal IM-04 SJ-04 CN-11
IM-05
CN-10 YY- 03 IM-07 CN-09 SJ-04 SJ-05
CN-05
CN- 06 SJ-03 IM-03 IM-02
CN-08 CN-02
SJ-02 YY-01 YY-02
CN-04
CN-07 N
CN-03
SJ-01
IM-01
0 2 4 10 km CN-01
Legend : River : Basin Boundary : Sub-basin Boundary
THE STUDY ON Fig. 5.8 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Basin Subdivision for Three Major Rivers CTI Engineering International Co., Ltd. Nippon Koei Co., Ltd. F - 5 - 8
THE STUDY ON Fig. 5.9 COMPREHENSIVE FLOOD MITIGATION
FOR CAVITE LOWLAND AREA CTI Engineering International Co., Ltd. Basin Subdivision for Drainage Area Nippon Koei Co., Ltd
F – 5 – 9 Manila Bay Bacoor Bay
Daan Bukid 13 12 SJ-10R 11 SJ-09 Creek IM-11 11 BC-03 SJ-10 BC-05 L CN-12 8 9 10 8 10 SJ-08 SJ-08 SJ-07 8 L R Bacoor 9 Palamitan River
Imus River 7 BC-02 River IM-10 6 7 BC-04 IM-09 5
BC-01 CN-11 7 YY-06 3 IM-06
SJ-06 River San Juan 4 YY-05 IM-05 IM-08 4 Canas River Canas
CN-10 6 YY-04 SJ-04 3 6 2 IM-04 Pason Cama Chile River Julian River NIA Canal
Matangilan SJ-05 IM-07 River CN-09 5 CN-08
IM-03 4 5 YY-03 Baluctot River
CN-06 Ylang Ylang River Ylang Ylang San Juan River San Juan Imus River IM-02
Canas River Canas 1 Panaysayan River Panaysayan 2 SJ-03 CN-07
CN-05 3 Dasmarinas River Dasmarinas
YY-02 IM-01
2 CN-04 Legend 1 SJ-02 CN-02 1 Sub-basin
YY-01 River Channel
CN-03Pulonan River Distributed SJ-01 CN-01 Source Point Source
THE STUDY ON Fig. 5.10 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Schematic Diagram of Flood Routing Model CTI Engineering International Co., Ltd. Nippon Koei Co., Ltd F - 5 - 10 COMPREHENSIVE FLOOD MITIGATION FLOOD COMPREHENSIVE Malimango Drainage Rosario-Poblacion CTI EngineeringInternational Co., Ltd. Malamok River FOR CAVITE LOWLAND AREA Sta. Isabel E Isabel Sta. Tirona River Sineguelasan San Rafael Binakayan Wakas N Silangan Ligtong Nippon Koei Co., Ltd Bacao THE STUDY ON Sapa Kawit-Poblacion Sta. Isabel W Pulvorista S6 Calero River Calero
S5 S5 S11 Banalo F -511 S4 S3 S4 S10 Fig. 5.11 Mabolo Salinas
S3 S2 S3 Schematic DiagramofDrainage Area Wakas S Wakas
S2 S2 S5 S9 San Juan
S1 Daan Bukid Creek
S4 S8
S1 S4 S2 S1
S3 S7 BACOOR S3 S1
Panamitan S2 S6 SAN JUAN CANAS
S1 IMUS
36 0 35 Rainfall 34 40 33 Calculation 32 Flood Mark 80 31 30 29 120 28 Rainfall (mm/hr) Water Level (El.m) Level Water 27 160 26 25 200 9/27 08:00 9/27 20:00 9/28 08:00 9/28 20:00 9/29 08:00 9/29 20:00 (1) Imus River (at NIA Canal) 36 0 35 Rainfall 34 40 33 Calculation 32 Flood Mark 80 31 30 29 120 28 Rainfall (mm/hr)
Water Level (El.m) Level Water 27 160 26 25 200 9/27 08:00 9/27 20:00 9/28 08:00 9/28 20:00 9/29 08:00 9/29 20:00 (2) Ylang Ylang River (at NIA Canal) 36 0 35 Rainfall 34 40 33 Calculation 32 Flood Mark 80 31 30 29 120
28 (mm/hr) Rainfall Water Level (El.m) 27 160 26 25 200 9/27 08:00 9/27 20:00 9/28 08:00 9/28 20:00 9/29 08:00 9/29 20:00 (3) San Juan River (at NIA Canal)
31 0 30 Rainfall 29 40 28 Calculation 27 26 Flood Mark 80 25 24 120 23
22 (mm/hr) Rainfall Water Level (El.m) 160 21 20 19 200 9/27 08:00 9/27 20:00 9/28 08:00 9/28 20:00 9/29 08:00 9/29 20:00 (4) Canas River (at NIA Canal) THE STUDY ON Fig. 5.12 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Verification Results of Flood Runoff Model orf the 2006 Flood CTI Engineering International Co., Ltd. Nippon Koei Co., Ltd F - 5 - 12 Daan Bukid Creek
Habay Bridge Palico Bridge 8 7 Bacoor River
Muntino Bridge Triburary NIA Canal
Island Cove Banalo Bridge Triburary Bridge 9 Anabu Balsahan Bridge Imus Bridge Dam
10 6 2 1
Imus River 4 3 Bacoor Bay 5 Bucandala Dam Julian River Taclong II Bridge Triburary
Present Land Use Point Peak Discharge for Each Return Period (m3/s) No. 2-year 3-year 5-year 10-year 20-year 30-year 50-year 100-year 1 200 240 310 420 550 600 650 700 2 270 320 430 600 750 750 850 950 3 80 90 100 120 150 160 170 180 4 130 150 170 210 240 250 280 300 52530304045455050 6 400 470 600 750 950 1,000 1,100 1,200 7 65 75 85 100 120 130 140 150 8 130 150 170 190 230 240 260 270 9 140 160 180 210 240 250 270 290 10 550 650 750 950 1,200 1,200 1,400 1,500 Future Land Use Point Peak Discharge for Each Return Period (m3/s) No. 2-year 3-year 5-year 10-year 20-year 30-year 50-year 100-year 1 310 370 430 500 600 650 700 800 2 410 470 600 700 800 850 950 1,000 3 130 140 160 170 190 190 200 210 4 200 230 260 280 310 310 330 350 54045505055606065 6 650 750 850 1,000 1,200 1,200 1,300 1,400 7 80 90 110 120 130 140 150 160 8 150 170 190 220 250 260 280 290 9 160 180 210 230 270 280 300 320 10 750 900 1,100 1,200 1,400 1,500 1,600 1,700
Point Peak Discharge for Each Return Period (m3/s) Future Land Use No. 2-year 3-year 5-year 10-year 20-year 30-year 50-year 100-year (with on-site flood 1 250 290 350 430 550 650 700 800 2 320 380 480 600 750 850 950 1,000 regulation pond) 3 90 100 120 140 160 190 200 210 4 140 170 200 240 230 310 330 350 52530354045606065 6 470 550 700 850 1,000 1,200 1,300 1,400 7 70 80 90 110 130 140 150 160 8 130 150 170 200 230 260 280 290 9 140 160 190 210 250 280 300 320 10 600 700 850 1,000 1,200 1,500 1,600 1,700
THE STUDY ON Fig. 5.13 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Probable Discharge Distribution of Imus River Basin CTI Engineering International Co., Ltd. Nippon Koei Co., Ltd F - 5 - 13 NIA Canal
Ylang-Ylang River Pasong Kastila Bacoor Bay Dam Panamitan Bridge 3
Panamitan River San Juan Ilang-Ilang Bridge Bridge 4 Bayan Diversion Dam 6 5 2 1 Diversion San Juan River point
Present Land Use Point Peak Discharge for Each Return Period (m3/s) No. 2-year 3-year 5-year 10-year 20-year 30-year 50-year 100-year 1 120 150 220 330 450 500 600 650 2 180 220 320 440 600 650 750 800 3 190 230 280 410 600 650 700 800 4 190 230 290 420 600 650 700 800 5 320 400 600 800 1,100 1,200 1,300 1,500 6 270 330 470 650 850 900 1,100 1,200
Future Land Use Point Peak Discharge for Each Return Period (m3/s) No. 2-year 3-year 5-year 10-year 20-year 30-year 50-year 100-year 1 160 190 230 350 470 550 600 700 2 220 270 340 460 600 650 750 850 3 270 320 370 490 650 700 750 850 4 270 320 380 490 650 700 750 850 5 410 500 650 850 1,100 1,200 1,400 1,500 6 340 410 550 700 850 950 1,100 1,200
Future Land Use (with on-site flood regulation pond) Point Peak Discharge for Each Return Period (m3/s) No. 2-year 3-year 5-year 10-year 20-year 30-year 50-year 100-year 1 130 160 220 340 460 550 600 700 2 190 240 320 450 600 650 750 850 3 220 250 300 430 600 700 750 850 4 220 260 320 440 600 700 750 850 5 340 420 600 850 1,100 1,200 1,400 1,500 6 290 350 480 650 850 950 1,100 1,200
THE STUDY ON Fig. 5.14 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Probable Discharge Distribution of San Juan River Basin CTI Engineering International Co., Ltd. Nippon Koei Co., Ltd F - 5 - 14 Manila Bay Tejero Bridge Plucena Dam
4 2 1 3 Tanza Canas River NIA Canal Bridge
Present Land Use Point Peak Discharge for Each Return Period (m3/s) No. 2-year 3-year 5-year 10-year 20-year 30-year 50-year 100-year 1 210 270 430 700 950 1,100 1,200 1,300 2 230 290 470 700 1,000 1,100 1,300 1,400 33035405575808595 4 240 320 500 750 1,100 1,200 1,300 1,500
Future Land Use Point Peak Discharge for Each Return Period (m3/s) No. 2-year 3-year 5-year 10-year 20-year 30-year 50-year 100-year 1 310 380 480 750 1,000 1,100 1,200 1,400 2 330 400 550 750 1,000 1,100 1,300 1,400 3455055708590100110 4 350 440 600 800 1,100 1,200 1,400 1,500
Future Land Use (with on-site flood regulation pond) Point Peak Discharge for Each Return Period (m3/s) No. 2-year 3-year 5-year 10-year 20-year 30-year 50-year 100-year 1 240 300 440 700 950 1,100 1,200 1,400 2 250 320 480 750 1,000 1,100 1,300 1,400 3303540607590100110 4 270 340 550 800 1,100 1,200 1,400 1,500
THE STUDY ON Fig. 5.15 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Probable Discharge Distribution of Canas River Basin CTI Engineering International Co., Ltd. Nippon Koei Co., Ltd F - 5 - 15 100
Envelop Curve 2
10 q: Specific Discharge (m3/s/km Discharge Specific q:
1 10 100 1,000 10,000 A: Catchment Area (km2)
Imus (Future Land Use) Imus (Present Land Use) San Juan (Future Land Use) San Juan (Present Land Use) Canas (Future Land Use) Canas (Present Land Use) Basins in and around Manila Laoag Cagayan Agno Sacobia-Bamban-Abacan Pampanga Bicol
Source: 1) Basins in and around Manila: The Study on Flood Control and Drainage Project in Metro Manila, Vol. 2, Supporting Report, 1990, JICA 2) Basins in the Luzon Island: Study for the Preparation of Flood Control Manual for Department of Public Works and Highways Technical Standards and Guidelines, Final Report, Main Report, Vol ume I, March 2003, JICA, DPWH THE STUDY ON Fig. 5.16 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Comparison of Specific Discharge with Other River Basins in the Luzon Island CTI Engineering International Co., Ltd. (5-year probable flood) Nippon Koei Co., Ltd F - 5 - 16 100
Envelop Curve 2
10 q: Specific Discharge (m3/s/km Discharge Specific q:
1 10 100 1,000 10,000 A: Catchment Area (km2) Imus (Future Land Use) Imus (Present Land Use) San Juan (Future Land Use) San Juan (Present Land Use) Canas (Future Land Use) Canas (Present Land USe) Basins in and around Manila Laoag Cagayan Agno Sacobia-Bamban-Abacan Pampanga Bicol
Source: 1) Basins in and around Manila: The Study on Flood Control and Drainage Project in Metro Manila, Vol. 2, Supporting Report, 1990, JICA 2) Basins in the Luzon Island: Study for the Preparation of Flood Control Manual for Department of Public Works and Highways Technical Standards and Guidelines, Final Report, Main Report, Vol ume I, March 2003, JICA, DPWH THE STUDY ON Fig. 5.17 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Comparison of Specific Discharge with Other River Basins in the Luzon Island CTI Engineering International Co., Ltd. (100-year probable flood) Nippon Koei Co., Ltd F - 5 - 17 Imus River (River mouth) Imus River (River mouth, 5-year probable flood) 1,800 1,200 1,600 1,400 1,000 1,200 800 1,000 800 600 600 400
400 (m3/s) Discharge Peak Discharge(m3/s) 200 200 0 2 3 5 10 20 30 50 100 0 0 6 12 18 24 30 36 42 48 Return Period (Year) Hour Future Land Use Present Land Use Future Land Use Present Land Use
San Juan River San Juan River (Diversion Point) (Diversion Point, 5-year probable flood) 1,800 1,200 1,600 1,400 1,000 1,200 800 1,000 800 600 600 400 Discharge (m3/s) Discharge
Peak Discharge (m3/s) 400 200 200 0 0 2 3 5 10203050100 0 6 12 18 24 30 36 42 48 Return Period (Year) Hour
Canas River (River mouth) Canas River 1,800 (River mouth, 5-year probable flood) 1,200 1,600 1,400 1,000 1,200 800 1,000 600 800 600 400 Discharge (m3/s)
Peak Discharge (m3/s) 400 200 200 0 0 0 6 12 18 24 30 36 42 48 2 3 5 10203050100 Return Period (Year) Hour
THE STUDY ON Fig. 5.18 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Increase in Runoff Discharge by Urbanization CTI Engineering International Co., Ltd. Nippon Koei Co., Ltd F - 5 - 18 µ
Legend Project Area less than 0m 0 - 1m 1 - 2m 2 - 3m 3 - 5m 5 - 10m 10 - 15m 15 - 20m 20 - 25m 25 - 30m 30 - 35m 35 - 40m out of target area
0241 km
THE STUDY ON Fig. 5.19 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Generated DEM by 100m Scaled Mesh JAPAN INTERNATIONAL COOPERATION AGENCY
F - 5 - 19 Typhoon Milenyo Legend in 2006 Inundation Depth No Flood 0.01 - 0.25m 0.25 - 0.5m µ 0.5 - 1.0m 0120.5 km 1.0 - 2.0m More than 2m
Alapan )"
Julian )")" Bucandala Bukol Bago-D )" )" Balbakin )" )" Siroy Bilad )" Ragatan )" )"
Kaliwa )" Anabu Bayan )" )" Calubcub )" Cosme Bago-U )" Buyang )" )" Pasong Buaya Camatchile )" )" Plucena )" SalaanTapun )" )" )" Pasong Kastila San Gabriel )" Hari Anton )" Ang Baluctot )" )" Emong )" Escribiente I )" Palindong )" Salitran Man)" )" )" Engue Escribiente II Abubot )" )" )"
Igme Maculing )" )" Kasundid )" Pari )" Menes Matanda )" Marcelo )" )" Danayan )"Hasaan 1 )" Kambing )" Saulog )" )" THE STUDY ON Fig. 5.20 COMPREHENSIVE FLOOD MITIGATION FOR CAVITE LOWLAND AREA Reproduction of Flood of Typhoon Milenyo in 2006 JAPAN INTERNATIONAL COOPERATION AGENCY
F - 5 - 20