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The Feasibility Study of the Flood Control Project for the Lower Cagayan River in the Republic of the Philippines

Final Report Supporting Report

Annex IV: Meteo-Hydrology

Figures

Figure 1.3.1

1st Type - Two pronounced sessons: dry from November to April wet during the rest of the year

2nd Type - No dry season with a very pronounced maximum rainfall from November to January

3rd Type - seasons not very pronounced, relatively dry from November to April. Wet during the rest of the year

4th Type - Rainfall more or less distributed throughout the year

LEGEND:

China Sea

Pacific Ocean

Sulu Sea

Celebes SeaBorneo

Cagayan River Basin

118° 120° 122° 124° 126°

Les

s Fr

eque

nt7%

Freq

uenc

y of

Tro

pica

l cyc

loesFr

eque

nt19

%Fr

eque

nt16

%

Ver

y Fr

eque

ncy

32%

Rar

e1%

IV-F1

Magat Dam

To

anR

iver

Pan

gul R

iver

Tanu

don

Riv

er

Sta. C

ruz Rive

r

Casecnan

River

Dummon River

Zinu

ndun

gan

Riv

erParet River

TuguegaraoRiver

Matalag

Rive

r

Chi

coRive

r

Mab aca River

Salta nRive

r Cag

ayan

River

Pasil River

Mal

ligRi

ver

Siff u River

Magat River

Sabo

ngan

Riv

er

T um auini River

Abuan R iver

Catalangan Rive

rCa

g ayan

Riv

er

Disbumgan

River

Ibulao River

Da vid

Rive

r

Dibubu

Ri ver

DibuluanR

iver

Ilag

anR

iver

Did

uyo

nR

iver

Addalam River

Kas ibu River

Cad

acl

anR

iver

1

253

7

3

4

5

6

28

9

16

11

10

12

13

17

14

18

20

1121

25

27

9

58

23

268

57

15

19

24

28

29 55

13 31

5

5610

4732

30

3

1514

54

3359

2

434

48

46

36

3545

737

38

60

64

63

61

39

40

50

41

BabuyanChannel

PhilippineSea

12130'

12100'

12200'

18 00'

17 30'

1700'

16 30'

16 00'

Climatological StationNo. Station Name No. Station Name12345678

AparriTuguegaraoEchagueSanto DomingoBaretbetAlimanao R.ConsueloBaligatan

9101112131415

LagaweWacalBontocBayombongHapidMalasinSan Isidro

Rainfall Gauging StationNo. Station Name12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364

AparriLal-loAggunetanBitag GrandeImurungBauanTuaoTuguegaraoBagabbaPinukpukSalegsegTomianganNanengGuilguilaTumauiniCabaganLubuaganBasaoIlaganBanga-anBontocBarligBaukoReina MercedesMt. PolisMt. DataNamulditanLagaweNayonEchagueDiadiSolanoBayombongBaratDupaxMalicoImuganConsueloGabongDakganCasiguranTaanUpper CasecnanAuroraAritaoKayapaWacalBantiConwapDippadiwTabayongLiasSan FranciscoCabarroguisHapid. LamutBaretbetBaligatanPoblacion LagaweSto DomingoKasibuKamamasiBiyoyAlayanPacket

0 10 20(km)

Scale

30 40 50

N

Climatological StationRainfall Gauging Station

LEGEND

Figure 2.1.1

Location of Meteorological Stations

I V - F 2

Magat Dam

To

anR

iver

Pan

gul R

iver

Tanu

don

Riv

er

Sta. C

ruz Rive

r

Casecnan

River

Dummon River

Zinu

ndun

gan

Riv

erParet River

TuguegaraoRiver

Matalag

Rive

r

Chi

coRive

r

Mab aca River

Salta nRive

r Cag

ayan

River

Pasil River

Mal

ligRi

ver

Siff u River

Magat River

Sabo

ngan

Riv

er

T um auini River

Abuan R iver

Catalangan Rive

rCa

g ayan

Riv

er

Disbumgan

River

Ibulao River

Da vid

Rive

r

Dibubu

Ri ver

DibuluanR

iver

Ilag

anR

iver

Did

uyo

nR

iver

Addalam River

Kas ibu River

Cad

acl

anR

iver

1

2

3

4

56

7

8

9 10

27 66

1

2

11

4

18

21

12

3

2867

13

14

1516

1777

205

2419

22

6

25

3226

3635

30

31

28

378

389

3934

42

30

1815

14

13

47

4850

1768

29

4270

34

73

49 16

45

35 7431

24

615521

26

36

75

57

3271

72

33

63

39

4140

25

53

62

59 23

2258

5420

37

76

52

46

4412

43

10

40

41

11

73 297

12130'

12200'

18 00'

17 30'

1700'

16 30'

16 00'

Streamflow Gauging StationNo. Station Name No. Station Name12345678910111213141516171819202122232425262728293031323334353637

AparriMaddaleroCatayauanCentro, CamalaniuganSimayPoblacion, GattaranCalaoaganNossipingTupangCalantacAsassiEscoltaAnguirayCentro, IguigBayoPangulCentro, SolanaLarion AltoPinukpukCataggamanNamabbalanLiglig GawaanNanengAbbotPasonglaoBaba-alanPatocAbutAntaganAmpawilenAnabelTomianganPattacanTaedBasaoAmbatoCasile

3839404142434445464748495051525354555657585960616263

MaligayaMunozMalalamPalattaoSupangMinangaDisulapCaipilanDipalinOscarizDulaoCabulayHapidCamandagPangalPanangGuinalvinBanteManamtamKamamasiMinuriDabubuNPC LamutBatoDippadiwPingkian

Sediment / Water QualityNo. Station Name

123456789101112131415161718192021222324252627282930313233343536373839404142

CalaoaganAsassiEscoltaLarion AltoLiglig GawaanPasonglaoAntaganCasileMunozMalalam (Alinguigan)PalattaoMinangaOscarizMagat DamsiteDulaoCabulayLamutHapid (Tupaya)CamandagGuinalvinBanteMinuriDabubuBatoDippadiwPingkianBangagBaybayogRosarioTungngodCarebBalilingBetiIlutAurora EastGamisJonesMaddelaConeapGabongDakganBagabag

Station NameTaanPonggoBangagBaybayogRosarioTugngodCarebBalilingBetiIlutAurora eastGomisJones

No.64656667686970717273747576

0 10 20(km)

Scale

30 40 50

N

LEGEND

Streamflow Gauging StationSediment / Water Quality Sampling

Figure 2.1.2

Location of Hydrological Stations

I V - F 3

No. Station Item Elevation

Latitude Longitude (meter asl)1 Aparri

Air TemperatureRelative HumidityWindSunshine HoursEvaporationAtmospheric Pres

2 TuguegaraoAir TemperatureRelative HumidityWindSunshine HoursAtmospheric PresEvaporation

3 EchagueAir TemperatureRelative HumidityWindSunshine HoursEvaporation

4 Santo DomingoAir TemperatureRelative HumidityWindSunshine HoursEvaporation

5 Barelbet,Bagabag Air Temperature

Relative Humidity 16o 35' 45" 121o 17' 10"WindSunshine HoursEvaporation

6 Alimanao R.,Tuguegarao Air Temperature

Relative HumidityWindSunshine HoursEvaporation

7 Consuelo,Santa Fe Air Temperature


8 Baligatan(Talictic) Air Temperature


9 LagaweAir TemperatureWindSunshine HoursEvaporation

320

121-40-00

600

16o25'

Location

120-57-00

18-22-00

17-39-00

16-42-00

62

66

3121-38-00

121-45-00

400

121-27-00 200

121-07-00

121o06'

16-10-00

16-48-00

16-48-00

Daily Data

Monthly Data

Climatological Data Collected During Master Plan Study Additional Climatological Data Collected During Feasibility Study

No. Station Item Elevation

Latitude Longitude (meter asl) Climatological Data Collected During Master Plan Study10 Wacal Rainfall

Air TemperatureRelative HumidityWindSunshine HoursEvaporation

11 BontocAir TemperatureRelative HumidityWindSunshine HoursEvaporation

12 BayombongNVSIT Air Temperature


13 HapidAir TemperatureRelative HumidityWindSunshine HoursEvaporation

14 MalasinAir TemperatureRelative HumidityWindSunshine HoursEvaporation

15 San IsidroAir TemperatureRelative HumidityWindSunshine HoursEvaporation

16 APC Comp.,Minanga Norte, Air TemperatureIguig, Cagayan Relative Humidity

WindSunshine HoursEvaporationAtom. Pressure

17 San FelipeIlagan, Isabela Maximum Temp.

Minimum Temp.WindRelative HumidityEvaporationAtom. Pressure

17-46-20 121-44-10 18

Location

280121-15-0016-42-00

Daily Data

Monthly Data

Additional Climatological Data Collected During Feasibility Study

No. Station Elev.

Latitude Longitude (m. asl) Data Collected During Master Plan Study1 Aparri 18-21' 121-39' 22 Lal-Lo 18-12' 121-40' 83 Aggunetan, Gattaran 18-04' 121-38' 104 Bitag Grande 17-54' 121-51'5 Imurung 17-55' 121-56'6 Bauan, Panablanca 17-50' 121-43' 107 Tuao 17-45' 121-28' 358 Tuguegarao 17-37' 121-44 199 Bagabba, Paneblanca 17-37' 121-47' 2010 Pinukpuk 17-35' 121-22' 12011 Salegseg, Balbalan 17-31' 121-06' 1,12012 Tomiangan, Tabuk 17-26' 121-26' 38013 Naneng, Tabuk 17-24' 121-14' 41814 Guiguila, Tanudan 17-18' 121-14' 50015 Tumauini 17-17' 121-49' 3016 Cabagan 17-26' 121-46'17 Lubuagan 17-22' 121-07'18 Basao, Tinglayan 17-14' 121-07' 60019 Ilagan 17-09' 121-53' 4720 Banga-An 17-07' 120-54' 1,60021 Bontoc 17-05' 120-58' 85522 Barlig 17-03' 121-06' 1,50023 Bauko 16-59' 120-52' 1,20024 Reina Mercedes 16-59' 121-50' 3425 Mt. Polis, Banague 16-58' 121-02' 1,90026 Mt. Data, Benguet 16-51' 120-52' 1,50027 Namulditan, Lagawe 16-51' 121-05' 90028 Lagawe 16-48' 121-04' 48029 Nayon, Lamut 16-43' 121-10' 32030 Echague 16-42' 121-40' 6631 Diadi 16-40' 121-22' 16832 Solano 16-31' 121-11' 25533 Bayombong 16-29' 121-09' 27834 Barat, Bambang 16-23' 121-06' 61035 Dupax 16-17' 121-05' 39036 Malica 16-11' 120-51' 1,25037 Imugan, Santa Fe 16-10' 120-55' 80038 Consuelo, Santa Fe 16-10' 120-57' 50639 Gabong 16-01' 121-21'40 Dakgan 16-05' 121-30'41 Casiguran 16-17' 122-07' 342 Taan43 Upper Casecnan

Location Source

Data Collected During Master Plan StudyPAGASA Aparri/Ctral

PAGASA Central

PAGASA CentralPAGASA

PAGASA Central

PAGASA FFWS

Pagasa Central

NIA

Additional Data Collected

No. Station Elev.

Latitude Longitude (m. asl) Data Collected During Master Plan Study44 Aurora45 Aritao46 Kayapa47 Wacol48 Banti49 Conwap50 Dippadiw51 Tabayang52 Lias, Barlig 17-05' 121-08'53 San Fransicso 18-10' 121-39'54 NIA-PIO, Cabarraguis 16-30' 121-32' 12955 Hapid, Lamut 16-42' 121-15' 28056 Baretbet (Dumayup) 16-35' 121-16' 23057 Baligatan 16-48' 121-27' 20058 Poblacion Lagawe 16-48' 121-07' 40059 Sto Domingo 16-25' 121-06' 32060 Kasibu 16-19' 121-18' 70161 Kamamasi 16-16' 121-25' 63962 Biyoy 16-15' 121-24' 62363 Aloyan 16-19' 121-24' 65364 Pocket 16-17' 121-20' 640

65 Magat Damsite66 Gamu67 Maris Damsite68 Pangal69 Cullalabo Burgos, Isabella70 Minanga, Iguig, Isabel 17-46' 121-44' 1871 Abulug 18o 20' 27" 121o 26' 48"

Location Source

Data Collected During Master Plan Study

NIA

NIAPAGASA FFWSPAGASA FFWSPAGASA FFWSPAGASA CentralDA IguigDA Region II


Magat Dam

To

anR

iver

Pan

gul R

iver

Tanu

don

Riv

er

Sta. C

ruz Rive

r

Casecnan

River

Dummon River

Zinu

ndun

gan

Riv

er

Pare t RiverTuguegarao

River

Matalag

Rive

r

Chi

coRive

r

Mab aca River

Salta nRive

r Cag

ayan

River

Pasil River

Mal

ligRi

ver

Siff u River

Magat River

Sabo

ngan

Riv

er

Tumauini Rive

r

Abuan R iver

Catalangan Rive

r

Cag ay

anR

iver

Disbumgan

River

Ibulao River

Da vid

Rive

r

Dibubu

Riv er

DibuluanR

iver

Ilag

anR

iver

Did

uyo

nR

iver

Addalam River

Kas ibu River

Cad

acl

anR

iver

3000

2500

3000

2500

2500

3000

4000

5000

4000

3000

2500

BabuyanChannel

PhilippineSea

12130'

12100'

12200'

18 00'

17 30'

17 00'

16 30'

16 00'

0 10 20(km)

Scale

30 40 50

NAparri

(mm)

500

400

300

200

100

0JFMAMJJASOND

(mm)

500

400

300

200

100

0JFMAMJJASOND

Naneng(mm)

500

400

300

200

100

0JFMAMJJASOND

Guilguila

(mm)

500

400

300

200

100

0JFMAMJJASOND

Barlig

(mm)

500

400

300

200

100

0JFMAMJJASOND

Bontoc

(mm)

500

400

300

200

100

0JFMAMJJASOND

Bauko

(mm)

700

600

500

400

300

200

100

0JFMAMJJASOND

Mt. Data

(mm)

500

400

300

200

100

0JFMAMJJASOND

Mt. Polis

(mm)

500

400

300

200

100

0JFMAMJJASOND

Consuelo

(mm)

500

400

300

200

100

0JFMAMJJASOND

Tuao

(mm)

500

400

300

200

100

0JFMAMJJASOND

Tuguegarao

(mm)

600

500

400

300

200

100

0JFMAMJJASOND

Casiguran

(mm)

500

400

300

200

100

0JFMAMJJASOND

Ilagan

(Data 1965-1978)

(mm)

500

400

300

200

100

0JFMAMJJASOND

Bitag Grande

(Data 1975-1978)

(mm)

500

400

300

200

100

0JFMAMJJASOND

Basao

(Data 1963-1978)

Figure 2.2.4

Isohyetal Map in the Cagayan River Basin

I V - F 9

No. Station RiverDrainage

Area(km2)

DischargeMeasurement Record

Zero ofGauge EL.

(m)Latitude Longitude (meter asl) Data Collected During Master Plan Study

1 Aparri Cagayan 17-40-00 121-37-00 27,281 0.02 Maddalero, Buguey Banurbor 18-16-00 121-50-00 112 Available -0.5743 Catayauan, Lal-lo Cagayan 18-18-00 121-39-00 27,081 0.04 Centro, Camalaniugan Cagayan 18-17-00 121-41-00 27,230 0.05 Simay (Alannay), Lasam Zinundungan 18-04-00 121-35-00 189 Available6 Poblacion, Gattaran Cagayan 18-04-00 121-38-00 26,615 0.07 Calaoagan, Dacquel Dummon 18-03-00 121-43-00 308 Available8 Nassiping, Gattaran Cagayan 17-58-00 121-37-00 21,473 0.09 Tupang Alcala Cagayan 17-57-00 121-38-00 21,436 0.010 Calantac, Alcala Paret 17-55-00 121-41-00 907 Available 3.34111 Asassi, Baggao Paret 17-55-00 121-47-00 73012 Escolta, Rizal Matalag 17-50-00 121-25-00 655 Available13 Anguiray, Amulong Cagayan 17-49-00 121-43-00 20,213 0.014 Centro, Iguig Cagayan 17-45-00 121-44-00 19,683 0.015 Bayo, Iguig Cagayan 17-42-00 121-44-00 19,625 0.016 Pangol, Solana Pangul 17-40-00 121-38-00 312 Available 20.39917 Centro, Solana Cagayan 17-39-00 121-41-00 19,545 0.018 Larion Alto, Tuguegarao Pina de Tuguegarao 17-38-00 121-46-00 655 Available 18.18419 Pinukpuk Saltan 17-37-00 121-24-00 856 Available20 Cataggaman, Tuguegarao Cagayan 17-35-00 121-40-00 19,494 0.021 Namabbalan, Tuguegarao Cagayan 17-32-00 121-47-00 18,685 0.022 Liglig Gawaan, Balbalan Saltan 17-31-00 121-12-00 25523 Naneng, Tabuk Chico Available24 Abbot, Pinukpuk Chico 17-42-00 121-26-00 3,349 43.69725 Pasonglao, Tabuk Chico 17-24-00 121-25-00 1,987Available26 Baba-Alan, Tabuk Tanudan 17-23-00 121-16-00 365 Available27 Patoc, Babaalan Tanudan28 Abut, Quezon Casile Creek 17-20-00 121-35-00 29 113.71929 Antagan, Tumauini Pina de Tuguegarao 17-17-00 121-56-00 170 Available30 Ampawilen Chico 751 Available31 Anabel Chico 605 Available32 Tomiangan Chico 17-24-00 121-14-00 1,408Available33 Pattacan, Tomiangan Chico34 Taed Chico 17-05-00 120-59-00 391 Available35 Basao Chico 17-14-00 121-08-00 891 Available36 Ambato, Tinglayan Chico 17-16-00 121-09-00 1,087Available37 Casile, Mallig Casile Creek 17-13-00 121-36-00 195 Available 49.11938 Maligaya, Mallig Mallig 17-11-00 121-36-00 563 Available 41.71639 Munoz, Roxas Siffu 17-09-00 121-34-00 686 Available 50.52040 Malalam (Alinguigan) Pina de Tuguegarao 17-08-00 121-54-00 3,123Available 26.14341 Palattao, Naguilian Cagayan 17-01-00 121-50-00 6,626Available 27.22742 Supang, Sabangan Sabangan 17-00-00 120-54-00 57 Available43 Minanga, SN Mariano Pina de Ilagan 17-00-00 122-01-00 1,565 Available44 Disulap, SN Mariano Disulap 16-58-00 122-05-00 146 Available45 Caipilan, Aurora Taotao 16-57-00 121-33-00 430 62.41646 Dipalin, Binatog Disabungan 16-57-00 122-04-00 198 Available

Location

Daily Gauge HeightDaily Discharge

Source


No. Station RiverDrainage

Area(km2)

DischargeMeasurement Record

Zero ofGauge EL.

(m)Latitude Longitude (meter asl) Data Collected During Master Plan Study

47 Oscariz (Maris Dam) Magat 16-47-00 121-30-00 4,150 89.74748 Dulao, Lagawe Alimit 16-44-00 121-20-00 573 Available49 Cabulay, Santiago Diadi 16-44-00 121-29-00 196 Available 79.48750 Hapid, Lamut (Tupaya) Ibulao 16-43-00 121-15-00 606 Available51 Camandag, Kiangan Cadaclan 16-36-00 121-03-00 261 Available52 Pangal, Echague Cagayan 16-36-00 121-41-00 4,24453 Panang, SN Agustin Cagayan 16-25-00 121-45-00 2,39254 Guinalvin, Aglipay Addalam 16-29-00 121-39-00 921 Available55 Bante, Bambang Matuno 16-27-00 121-04-00 558 Available56 Manamtam, Bambang Matuno57 Kamamasi, Kasibu Diduyon 16-16-00 121-27-00 462 Available58 Minuri, Jones Dibuluan 272 Available59 Dabubu, Pequino Dabubu 16-27-00 121-47-00 162 Available60 NPC Lamut Magat61 Bato, Bayombong Magat 16-26-00 121-07-00 1,649Available 294.05762 Dippadiw, Madella Cagayan 16-23-00 121-44-00 2,380Available63 Pingkian, Kayapa Sta. Cruz 16-19-00 120-57-00 162 Available64 Taan Taan65 Ponggo, Madella Casecnan66 Bangag Cagayan 18-07-00 121-41-00 Available -1.5267 Baybayog Paret 17-54-00 121-41-00 966 Available 1.9868 Rosario Rosario 16-39-00 121-18-00 Available 225.3769 Tungngod Burnay 16-48-00 121-07-00 95 Available70 Careb Lanog 16-34-00 121-12-00 Available71 Baliling Sta. Fe 16-14-00 120-58-00 96 Available 487.3272 Beti Marang 16-15-00 121-03-00 Available73 Ilut Ilut 16-40-00 121-26-00 Available 145.48974 Aurora East Ganano Available75 Gamis Dumatata 16-40-00 121-32-00 Available76 Centro Jones Cagayan 16-33-25 121-42-00 2,960Available77 Tuguegarao Cagayan78 Tumauini Cagayan

79 Pinaripay, Agripay Addalam 16-27-57 121-19-54 709 Available 92.2480 Nagtipunan, Quirino Cagayan 16-18-25 121-39-56 2,323

Location

Daily Gauge Height

Daily Discharge

Source

DPWHDPWHDPWH

DPWHDPWH


The Feasibility Study of the Flood Control Projectfor the Lower Cagayan River

in the Republic of the PhilippinesJAPAN INTERNATIONAL COOPERATION AGENCY

Figure 2.2.8

List of Sediment and Water Quality Record

Sediment

Water Quality

No. Station River

Latitude Longtitude1 Calaogan, Dacquel Dummon 18-03-00 121-43-002 Asassi, Baggao Paret 17-55-00 121-47-003 Escolta, Rizal Matalag 17-50-00 121-25-004 Larion Alto, TuguegaraoTuguegarao 17-38-00 121-46-005 Liglig Gawaan, BalbalanSaltan 17-31-00 121-12-006 Pasonglao, Tabuk Chico 17-24-00 121-25-007 Antagan, Tumauini Tumauini 17-17-00 121-56-008 Casile, Mallig Casile 17-13-00 121-36-009 Munoz, Roxas Siffu 17-09-00 121-34-0010 Malalam (Alinguigan) Ilagan 17-08-00 121-54-0011 Palattao, Naguilian Cagayan 17-01-00 121-50-0012 Minanga, Sn Mariano Ilagan 17-00-00 122-01-0013 Oscariz, Sn Mateo Magat 16-47-00 121-30-0014 Magat Damsite Magat15 Dulao, Lagawe Alimit 16-44-00 121-20-0016 Cabulay, Santiago Diadi 16-44-00 121-29-0017 Lamut Lamut18 Hapid, Lamut (Tupaya) Ibulao 16-43-00 121-15-0019 Kamandag, Kiangan Cadaclan 16-36-00 121-03-0020 Guinalvin, Aglipay Addalam 16-29-00 121-39-0021 Bante, Bambang Matuno 16-27-00 121-04-0022 Minuri, Jones Dibuluan23 Dabubu, Pequino Dabubu 16-27-00 121-47-0024 Bato, Bayombong Magat 16-26-00 121-07-0025 Dippadiw, Madella Cagayan 16-23-00 121-44-0026 Pingkian, Kayapa Sta. Cruz 16-19-00 120-57-0027 Bangag Cagayan 18-07-00 121-41-0028 Baybayog Paret 17-54-00 121-41-0029 Rosario Rosario 16-39-00 121-18-0030 Tungngod Burnay 16-48-00 121-07-0031 Careb Lanog 16-34-00 121-12-0032 Baliling Sta. Fe 16-14-00 120-58-0033 Beti Marang 16-15-00 121-03-0034 Ilut Ilut 16-40-00 121-26-0035 Aurora East Ganano36 Gamis Dumatata 16-40-00 121-32-0037 Jones Cagayan 16-33-00 121-42-0038 Madella, Quirino Tabayong39 Conwap Cagayan40 Gabong Casecnan41 Dakgan Casecnan42 Bagabag Magat

Location

Data Collected During Master Plan Study Additional Data Collected

IV-F20


in the Republic of the Philippines

Figure 2.3.1

JAPAN INTERNATIONAL COOPERATION AGENCYSchematic Profile of Water Level Gauge

Maximum Flood Water Level

LWL

Water Level Recorder

Original Ground Line

Foundation Concrete Block

Perforated Steel Pipes(φ=100mm)

Sensor

Cobble Stone

Metal Fitting

Cable & WireLine

(2) Plan

(1) Section

Gauge House

Door

Back Filling

PVC Pipes (φ=100mm)

Non-perforated Steel Pipes(φ=100mm)

Concrete Block

Water Level Recorder

Back Filling

Foundation Concrete Block

PVC Pipes (φ=100mm)

IV-F21

Daily Mean Water Level (Jul. 1 - Sep. 20, 2000)

7/1

Hourly Water Level (Sep.10 - Sep.15, 2000)

0 12 0 12 0 12 0 12 0 12 0 12 24

-2

0

2

4

6

8

10

12

14

16

18

-2

0

2

4

6

8

10

12

14

16

18

7/10 7/20 8/1 8/10 8/20 9/1 9/10 9/20

Sep. 10 Sep. 11 Sep. 12 Sep. 13 Sep. 14 Sep. 15

Santa Maria

Iguig

Nassiping

Magapit

Santa Maria

Iguig

Nassiping

Magapit

Max : 16.55 m

Max : 10.58 m

Max : 5.78 m

Max : 1.56 m

Max : 16.81 m

Max : 10.92 m

Max : 6.08 m

Max : 1.78 m

7/5 7/15 7/25 8/5 8/15 8/25 9/5 9/15



Santo Domingo

Dantor

Dumayup

Halong

Buyoc

Magat Dam Site

(1) Oct. 4 - Oct. 5, 1993

05

10152025303540

0 6 12 18Time (hour)

Total = 177 mmMax = 26 mm

(2) Oct. 23, 1998

05

10152025303540



(1) Oct. 4 - Oct. 5, 1993

05

10152025303540



(2) Nov. 1 - Nov. 2, 1993

05

1015

2025303540



(3) Oct. 1 - Oct. 2, 1995

05

10152025303540



(1) Oct. 4 - Oct. 5, 1993

0

51015

2025

3035

40



(2) Oct. 1 - Oct. 2, 1995

05

10152025303540



(3) Nov.3 - Nov.4, 1995

05

10152025303540



(4) Dec.23 - Dec.24, 1998

0

510

1520

2530

3540



(5) Nov.2 - Nov.3, 1999

0

5

10

15

20

25

30

35

40



(1) Oct. 1 - Oct. 2, 1995

0

10

20

30

40

50

60

70

80



(1) Oct. 1 - Oct. 2, 1995

05

10152025303540



(2) Nov.2 - Nov.3, 1999

0

5

1015

2025

30

35

40

Time (hour)0 6 12 18


(1) Dec.23 - Dec.24, 1998

0

5

10

15

20

25

30

35

40



(2) Nov.2 - Nov.3, 1999

0

5

10

15

20

25

30

35

40



Figure 3.1.1

Storm Records (3)

IV-F25



Figure 3.1.2

JAPAN INTERNATIONAL COOPERATION AGENCYFlood Hydrograph at Magat Dam Site (2/2)

Maring (Sep 92)

01,0002,0003,0004,0005,0006,0007,0008,0009,000

0 6 12 18 24 30 36 42 48 54 60 66 72

Time (hour)

Floo

d R

unof

f (m3 /s

ec)

Kadiang (Oct 93)

01,0002,0003,0004,0005,0006,0007,0008,0009,000

0 6 12 18 24 30 36 42 48 54 60 66 72

Time (hour)

Floo

d R

unof

f (m3 /s

ec)

Husing (Nov 93)

01,0002,0003,0004,0005,0006,0007,0008,0009,000

0 6 12 18 24 30 36 42 48 54 60 66 72

Time (hour)

Floo

d R

unof

f (m3 /s

ec)

Monsoon (Dec 95)

01,0002,0003,0004,0005,0006,0007,0008,0009,000

0 6 12 18 24 30 36 42 48 54 60 66 72

Time (hour)

Floo

d R

unof

f (m3 /s

ec)

Iliang (Oct 98)

01,0002,0003,0004,0005,0006,0007,0008,0009,000

0 6 12 18 24 30 36 42 48 54 60 66 72

Time (hour)Fl

ood

Run

off (

m3 /sec

)

Loleng (Oct 98)

01,0002,0003,0004,0005,0006,0007,0008,0009,000

0 6 12 18 24 30 36 42 48 54 60 66 72

Time (hour)

Floo

d R

unof

f (m3 /s

ec)

Mameng (Oct 95)

01,0002,0003,0004,0005,0006,0007,0008,0009,000

0 6 12 18 24 30 36 42 48 54 60 66 72

Time (hour)

Floo

d R

unof

f (m3 /s

ec)

Monsoon (Dec 98)

01,0002,0003,0004,0005,0006,0007,0008,0009,000

0 6 12 18 24 30 36 42 48 54 60 66 72

Time (hour)

Floo

d R

unof

f (m3 /s

ec)

Monsoon (Nov 99)

01,0002,0003,0004,0005,0006,0007,0008,0009,000

0 6 12 18 24 30 36 42 48 54 60 66 72

Time (hour)

Floo

d R

unof

f (m3 /s

ec)

Rosing (Nov 95)

01,0002,0003,0004,0005,0006,0007,0008,0009,000

0 6 12 18 24 30 36 42 48 54 60 66 72

Time (hour)

Floo

d R

unof

f (m3 /s

ec)

IV-F27



Figure 3.2.1

JAPAN INTERNATIONAL COOPERATION AGENCYFlow Chart for Flood Analysis

a) Construction of River System Model

Base Point

RiverSystemModel

Basin andChannelFactor

Computed FloodHydrograph at MagatDam

Model is Suitableor Not

Storage Function Modelfor the Cagayan RiverBasin (K, P, Tl, f1, Rsa,and Qb)

Model is Suitableor Not

Probable RunoffDistribution underPresent River Condition

Probable RunoffDistribution under theAlternative FloodControl Plans

HourlyRunoff Data

Lag Time (Tl)Base Flow (Qb)Primary RunoffCoefficient (f1)Saturated Rainfall (Rsa)

Alternative Flood Control Plans

HourlyRainfall Data

DesignRainfallPattern

DesignRainfall

Distribution

Daily RainfallData

AnnualMaximum

Basin MeanRainfall

RainfallCoefficient(by ThiessenPolygonMethod)

ProbableRainfall

b) Rainfall Analysis

c) Flood Runoff Analysis

Basin Map(1/50,000)

Observed FloodHydrographs at

Magat Dam

Storage Function Modelfor the Magat RiverBasin (K, P)

Yes

No

Yes

No

Recorded Flood PeakRunoff at SelectedGauges in the CagayanRiver Basin

IV-F28

River Course

Basin Boundary

Sub-basin Boundary

Base Point

Sub-basin Number

Channel Number

Existing Dam

Proposed Dam

Legend

No

Magat Dam

No

BP. No

To

an R

iver

BP-1

BP-2

BP-3

BP-4

BP-9

BP-5

BP-6

BP-7

BP-8

Pinukpuk Dam

Chico No.4 Dam

Chico No.2 Dam

Mallig No.2 Dam

Siffu No.1 Dam

Disabungan Dam

Ilagan No.1 DamAlimit No.1 Dam

Diduyon Dam

Addalam Dam

Cagayan No.1Dam

Cagayan No.2Dam

Casecnan Dam

Matuno Dam

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

Pan

gul R

iver

Tanu

don

Riv

er

Sta. C

ruz R

iver

Casecnan R

iver

Dummon River

Zinundunga

n R

iver

Paret River

Tuguegarao River

Matala g River

Ch

ico

Riv

er

Maba c a River

Saltan Riv

er

Cagayan

Riv

er

Pasil River

Mal

lig R

iver

Siffu River

Magat Rive

r

Sabo

ngan

Riv

er

T umau ini Rive r

Abuan Riv er

Catalangan Rive

r

Cag

ay

an Riv

er

Disbumgan Ri verIbulao River

Dav id Ri ver

Dibubu Rive r

Dibuluan River

Ilag

an R

iver

Di d

uyon

Riv

er

A

ddal

am River

Kasibu R iver

Cad

acla

n R

ive

r

18

17

15

19

16

1314

49

50

48

47

38

46

45

37

36

35

34 33

4432

31

30

27

26

42

43

41

40 28

39

20

11

29

78

1

2

3

9

4 5

6

22

23

10

12

25

21

24

Figure 3.3.1

Basin Division in the Cagayan River System

N

0 10 20(km)

Scale

30 40 50

IV-F29



Figure 3.3.2Cagayan River System Model for FloodRunoff Analysis

1

1

1

22

2

3

3

3

5 4

4

7

8

12

BP-5

16

BP-4

19

20

21

22

28

BP-2

29

30

BP-1

6

10 11

12

7

4

5

8

5

6

9

13

14

156

9

1716

187

10

819

11

20

BP-9

21BP-8

26

22

13

9

23

14

2425 10

15

27BP-3

BP-7

29

17 11 28

31

18 12 30

3233

3435

3637

38

39

23

13

24

25

14

26

27

40

41

42

43

44 4515

46

4748

49

50

Casecnan Dam

Cagayan No.2Dam

Cagayan No.1Dam

Diduyon Dam

Addalam (A) Dam

Ilagan No.1Dam

DisabunganDam

Matuno No.1 Dam

Alimit No.1 (A) Dam

Magat Dam

Chico No.2 DamSiffu No.1 (A) Dam

Chico No.4 DamMallig No.2 Dam

Pinukpuk Dam

Magat River

Ilagan River

Siffu River

Mallig River

Chico RiverSub-basin

River Channel

Dam

Base Point

Legend

BP-6

IV-F30

Case 4 (1977 ~ 1984)

Case 3 (1968 ~ 1976)

Case 2 (1964 ~ 1967)

Case 1 (1956 ~ 1963; 1985 ~ 1999)

Figure 3.4.1

Thiessen Polygon of Cagayan River Basin

N

0 10 20 (km)Scale

30 40 50

IV-F31



Figure 3.4.2

JAPAN INTERNATIONAL COOPERATION AGENCYRelationship between Rainfall Rate andDuration Time

Comparison of Rt/Rd Curve

0

20

40

60

80

100

0 4 8 12 16 20 24

Duration Time (hr)

Rt/R

d (%

)

1987 M PT his J ICA Study

IV-F32



Figure 3.4.3

JAPAN INTERNATIONAL COOPERATION AGENCYHourly Rainfall Distribution

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

1 24 48 72Time (hr)

t Rainfall t Rainfall t Rainfall t Rainfall(hr) (%) (hr) (%) (hr) (%) (hr) (%)

1 0.48 25 0.48 49 9.35 73 0.482 0.48 26 0.48 50 5.47 74 0.483 0.48 27 0.48 51 3.58 75 0.484 0.48 28 0.48 52 2.55 76 0.485 0.48 29 0.48 53 1.91 77 0.486 0.48 30 0.48 54 1.47 78 0.487 0.48 31 0.48 55 1.17 79 0.488 0.48 32 0.48 56 0.95 80 0.489 0.48 33 0.48 57 0.79 81 0.4810 0.48 34 0.48 58 0.67 82 0.4811 0.48 35 0.48 59 0.57 83 0.4812 0.48 36 0.48 60 0.50 84 0.4813 0.48 37 0.53 61 0.48 85 0.4814 0.48 38 0.62 62 0.48 86 0.4815 0.48 39 0.72 63 0.48 87 0.4816 0.48 40 0.86 64 0.48 88 0.4817 0.48 41 1.05 65 0.48 89 0.4818 0.48 42 1.31 66 0.48 90 0.4819 0.48 43 1.66 67 0.48 91 0.4820 0.48 44 2.20 68 0.48 92 0.4821 0.48 45 3.03 69 0.48 93 0.4822 0.48 46 4.37 70 0.48 94 0.4823 0.48 47 7.00 71 0.48 95 0.4824 0.48 48 13.30 72 0.48 96 0.48

��

��

96

13.30 %

IV-F33



12

3

4

5

6

7

12

3

4

5

6

7

12

3

4

5

6

7

12

3

4

5

6

7

Case 1 Case 2

Case 3 Case 4

Consuelo

Sto. Domingo

Baretbet

Hapid

LagaweDam Site

Dam Site

Dumayup(Baretbet)

Sto. Domingo

Dantor

Buyoc

Halong

Case 1 Case 2

Basin No. Dam Site Hapid Baretbet Lagawe Sto. Domingo Consu elo Basin No. Dam Site Hapid Baretbet Lagawe Sto. Domingo Consu elo1 - - - - 0.42 0.58 1 - - - - 0.42 0.582 - - - - 0.53 0.47 2 - - - - 0.53 0.473 - - 0.01 0.32 0.67 - 3 - - 0.01 0.32 0.67 -4 - 0.13 0.45 0.10 0.32 - 4 - - 0.54 0.14 0.32 -5 - 0.12 - 0.88 - - 5 - - 0.03 0.97 - -6 0.25 0.05 - 0.70 - - 6 0.26 - - 0.74 - -7 0.44 0.56 - - - - 7 0.71 - 0.24 0.05 - -

Case 3 Case 4

Basin No. Dam Site Hapid Baretbet Lagawe Sto. Domingo Consu elo Basin No. Dam Site Dantor Halon g Buyoc Dumayup Sto. Domingo1 - - - - 0.42 0.58 1 - - - - - 12 - - - - 0.53 0.47 2 - - - - - 13 - - 0.01 0.32 0.67 - 3 - - 0.20 0.11 0.48 0.694 - 0.13 0.45 0.10 0.32 - 4 - - 0.02 0.17 - 0.345 - 0.12 - 0.88 - - 5 - 0.35 0.73 0.23 - -6 - 0.26 - 0.74 - - 6 0.24 0.88 0.48 0.05 - -7 - 1.00 - - - - 7 0.59 0.03 - 0.28 0.11 -

Figure 3.5.1

Thiessen Polygons of Magat Dam Basin

IV-F34

T7717 UDING

T7810 MIDING

T7822 KADING

T8019 YONING

TS8410 MARING

1992 MARING

1999 MONSOON

1998 MONSOON

ObservedCalculated

0 6 12 18 24 30 36 42 48 54 60 66 72Time (hr)

0

1,000

2,000

3,000

4,0005,000

6,000

7,000

8,000

9,000

0 6 12 18 24 30 36 42 48 54 60 66 72Time (hr)

0

1,000

2,000

3,000

4,0005,000

6,000

7,000

8,000

9,000

ObservedCalculated

0 6 12 18 24 30 36 42 48 54 60 66 72Time (hr)

0

1,000

2,000

3,000

4,0005,000

6,000

7,000

8,000

9,000

ObservedCalculated

0 6 12 18 24 30 36 42 48 54 60 66 72Time (hr)

0

1,000

2,000

3,000

4,0005,000

6,000

7,000

8,000

9,000

ObservedCalculated

0 6 12 18 24 30 36 42 48 54 60 66 72Time (hr)

0

1,000

2,000

3,000

4,0005,000

6,000

7,000

8,000

9,000

ObservedCalculated

0 6 12 18 24 30 36 42 48 54 60 66 72Time (hr)

0

1,000

2,000

3,000

4,0005,000

6,000

7,000

8,000

9,000

ObservedCalculated

0 6 12 18 24 30 36 42 48 54 60 66 72Time (hr)

0

1,000

2,000

3,000

4,0005,000

6,000

7,000

8,000

9,000

ObservedCalculated

0 6 12 18 24 30 36 42 48 54 60 66 72Time (hr)

0

1,000

2,000

3,000

4,0005,000

6,000

7,000

8,000

9,000



Figure 3.5.5

JAPAN INTERNATIONAL COOPERATION AGENCYProbable Flood Peak Runoff Distribution underthe Present River Condition

BP-1(27,300)

BP-2(21,473)

BP-6 (4,551) BP-7 (2,015)

BP-3(15,334)

BP-8 (3,132)BP-4(11,993)

BP-5(6,633)

BP-9 (5,113)

Ilagan No.1 Dam (1,350)Disabungan Dam (652)

PinukpukDam(856)

Chico No.4 Dam(1,410)

Chico No.2 Dam(720)

Mallig No.2Dam (362)

Siffu No.1 (A)Dam (656)

Alimit No.1(A) Dam (559)

Matuno No.1Dam (550)

Magat Dam(4,143)

Addalam (A)Dam (864)

Diduyon Dam(477)

Cagayan No.1Dam (2,364)

Cagayan No.2Dam (1,631)

Casecnan Dam(1,150)

Note : Figures parenthesizad show the Catchment area inkm2.

Unit : m3/secBase Point 1/2 1/5 1/10 1/25 1/50 1/100 1/200 1/1,000 1/10,000

Casecnan 3,600 5,800 7,500 9,700 14,500 20,700 26,000 42,000 72,800Cagayan No.2 3,800 5,800 7,300 9,200 13,500 19,400 24,000 38,000 65,900Cagayan No.1 2,500 4,500 6,200 8,500 12,500 17,200 22,000 34,000 59,400Diduyon 1,300 2,000 2,600 3,700 5,200 7,500 9,500 14,500 25,000Addalam (A) 600 1,300 1,900 2,900 4,200 5,650 7,500 13,000 24,550Matuno No.1 750 1,050 1,300 1,550 1,800 2,050 2,300 3,000 4,150Alimit No.1 (A) 450 700 850 1,100 1,350 1,650 2,000 3,200 5,750Magat - - - - - - - - -Ilagan No.1 1,750 3,200 4,300 6,350 7,600 8,950 11,500 17,000 28,050Disabungan 1,050 1,900 2,700 3,800 5,400 7,600 9,200 14,000 24,750Siffu No.1 (A) 400 700 950 1,300 1,600 1,950 2,500 4,000 7,100Mallig No.2 300 400 600 800 950 1,100 1,400 2,200 3,950Chico No.2 850 1,350 1,750 2,300 2,850 3,550 4,000 5,300 9,250Chico No.4 800 1,450 2,000 2,750 3,600 4,500 5,400 7,800 12,250Pinukpuk 700 1,200 1,600 2,200 2,700 3,150 4,000 6,300 10,700Base Point No.1 6,200 9,900 12,000 15,700 18,100 21,400Base Point No.2 5,800 9,400 11,500 15,300 17,700 21,000Base Point No.3 6,100 10,300 12,900 17,700 20,900 25,300Base Point No.4 5,400 9,300 11,600 16,200 19,300 23,500Base Point No.5 3,300 5,900 7,200 10,100 12,500 14,700Base Point No.6 2,000 3,000 3,800 5,200 7,500 8,700Base Point No.7 1,200 1,600 2,000 2,700 3,000 3,300Base Point No.8 2,000 3,400 4,700 6,700 7,600 9,400Base Point No.9 2,700 4,500 6,000 7,200 9,500 10,600Base Point No.1 6,200 9,700 11,600 15,000 17,300 20,300Base Point No.2 5,700 9,300 11,200 14,600 16,900 19,900Base Point No.3 6,100 9,800 12,000 16,100 19,000 22,600Base Point No.4 5,400 9,000 10,900 14,700 17,600 21,000Base Point No.5 3,300 5,900 7,200 10,100 12,500 14,700Base Point No.6 2,000 3,000 3,800 5,200 7,500 8,700Base Point No.7 1,200 1,600 2,000 2,700 3,000 3,300Base Point No.8 2,000 3,400 4,700 6,700 7,600 9,400Base Point No.9 2,500 3,500 4,300 5,000 6,300 7,000

Prob

able

Flo

od P

eak

(1-d

ay)

Wit

hout

Mag

at D

amW

ith M

agat

Dam

IV-F38

BP-1 (Mouth of the Cagayan Main Stream)

0

6,000

12,000

18,000

24,000

30,000

BP-3 (Conf. of the Cagayan and the Siffu)

0

6,000

12,000

18,000

24,000

30,000

0

6,000

12,000

18,000

24,000

30,000

BP-2 (Conf. of the Cagayan and the Chico)

0

6,000

12,000

18,000

24,000

30,000

BP-4 (Conf. of the Cagayan and the Ilagan)

0

4,000

8,000

12,000

16,000

20,000

BP-5 (Conf. of the Cagayan and the Magat)

14,700

0

1,800

3,600

5,400

7,200

9,000 8,700

BP-6 (the Chico River Mouth)

BP-7 (the Siffu River Mouth)

0

800

1,600

2,400

3,200

4,000

21,400

0 24 48 72 96 120 144 168 192 216

Time (hour)

0 24 48 72 96 120 144 168 192 216

Time (hour)

0

70

0

70

0

70

0 24 48 72 96 120 144 168 192 216

Time (hour)

0 24 48 72 96 120 144 168 192 216

Time (hour)

0

70

0 24 48 72 96 120 144 168 192 216

Time (hour)

0

70

0 24 48 72 96 120 144 168 192 216

Time (hour)

0

70

0 24 48 72 96 120 144 168 192 216

Time (hour)

0

70

3,300

0 24 48 72 96 120 144 168 192 216

Time (hour)

0

70

0

2,000

4,000

6,000

8,000

10,000

BP-8 (the Ilagan River Mouth)

0

4,000

8,000

12,000

16,000

20,000

0 24 48 72 96 120 144 168 192 216

Time (hour)

0

70

BP-9 (the Magat River Mouth)

9,400

20,300

21,000 19,900

25,30022,600

23,50021,000

10,600

7,000

Without Magat DamWith Magat Dam





Work Flow of Streamflow Analysis



JAPAN INTERNATIONAL COOPERATION AGENCY

Figure 4.2.1

Dailyrainfall

data

Waterbalancepoint

Isohyetalmap

Basinmap

Basindivision

map

Dailyrunoffdata

Selecteddailyrunoff

Monthlyevaporation

data

10-day meanrunoff atselectedgauge

Runoff modelfor selectedrunoff gauge

22 years long10-day runoff

at selectedrunoff gauge

Anniual rainfallat

selected gaugeand runoff

gauge basin

SelectedDaily

rainfall

10-dayrainfall

at selectedgauge

10-dayrainfall at

selected runoffgauge basin

22 years long10-day runoff

forsubbasins

Drainage areaand annual

rainfallfor

subbasins

Verified22 years long10-day runoff

Recordedgauge height

anddischarge

IV-F40

To

anR

iver

Pan

gul R

iver

Tanu

don

Riv

er

Sta. C

ruz Rive

r

Casecnan

River

Dummon River

Zinu

ndun

gan

Riv

er

Paret

RiverTuguegarao

River

Matalag

Rive

r

Chic oRi

ver

Mab aca River

Salta nRive

r Cag

ayan

River

Pasil River

Mal

ligRi

ver

Siff u River

Magat River

Sabo

ngan

Riv

er

T um auini River

Abuan R iver

Catalangan Rive

r

Caga

yan

Riv

er

Disbumgan

River

Ibulao River

Da vid

Rive

r

Dibubu

Riv er

DibuluanR

iver

Ilag

anR

iver

Did

uyo

nR

iver

Addalam River

Kasib u River

Cad

acl

anR

iver

Basin 5(Upper Chico)

Basin 6(Lower Chico)

Basin 2(Magat)

Basin 4(Lower Cagayan)

Basin 3(Ilagan)

Basin 1(Upper Cagayan)

12130'

12100'

12200'

18 00'

17 30'

17 00'

16 30'

16 00'

Tuao

Tuguegaraoao

IlaganBontoc

Nayon

Guinalvin

Dulao

Ampawilen

Minanga

Pinukpuk

Larion Alto

0 10 20(km)

Scale

30 40 50

N

: Runoff gauge

: Raingauge

LEGEND

Figure 4.3.1

Basin Division and Selected Gauge

IV-F41

Magat Dam

To

anR

iver

Pan

gul R

iver

Tanu

don

Riv

er

Sta. C

ruz Rive

r

Casecnan

River

Dummon River

Zinu

ndun

gan

Riv

er

Pare t RiverTuguegarao

River

Matalag

Rive

r

Chi

coRive

r

Mab aca River

Salta nRive

r Cag

ayan

River

Pasil River

Mal

ligRi

ver

Siff u River

Magat River

Sabo

ngan

Riv

er

Tumauini Rive

r

Abuan R iver

Catalangan Rive

r

Cag ay

anR

iver

Disbumgan

River

Ibulao River

Da vid

Rive

r

Dibubu

Riv er

DibuluanR

iver

Ilag

anR

iver

Did

uyo

nR

iver

Addalam River

Kas ibu River

Cad

acl

anR

iver

18

17

15

19

16

1314

49

50

48

47

38

46

45

37 36

35

34

33

44

32

3130

27

26

42

43

4140 28

39

20

11

29

78

1

2

3

9 4 5

6

22

23

10

12

25

21

24

5152

53

3000

2500

3000

2500

2500

3000

4000

5000

4000

3000

2500

12130'

12100'

12200'

18 00'

17 30'

17 00'

16 30'

16 00'

0 10 20(km)

Scale

30 40 50

N

Figure 4.3.2

Isohyetal Map

IV-F42



Figure 4.3.3

JAPAN INTERNATIONAL COOPERATION AGENCYTank Model and Calibrated Coefficients

CB

CL

CU

Tank-1

CB

CL

CU

Tank-2

CB

CL

CU

Tank-3

CB

CL

CU

Tank-4

CU : Coefficient of Upper Hole

CL : Coefficient of Lower Hole

CB : Coefficient of Bottom Hole

HU : Height of Upper Hole (mm)

HL : Height of Lower Hole (mm)

WD : Initial Water Depth (mm)

GuinalvinTank-1 Tank-2 Tank-3 Tank-4

CU 0.35 0.05 0.02 0.0CL 0.10 0.03 0.01 0.010CB 0.35 0.15 0.07 0.001HU 50 30 5 0HL 10 10 0 0

WD 40 200 200 700

DulaoTank-1 Tank-2 Tank-3 Tank-4

CU 0.35 0.04 0.02 0.0CL 0.08 0.02 0.015 0.010CB 0.25 0.12 0.06 0.001HU 60 30 5 0HL 10 10 0 0WD 40 100 200 800

MinangaTank-1 Tank-2 Tank-3 Tank-4

CU 0.25 0.03 0.02 0.0CL 0.10 0.02 0.015 0.014CB 0.35 0.12 0.09 0.001HU 60 30 10 0HL 30 10 0 0

WD 50 150 150 600

Larion AltoTank-1 Tank-2 Tank-3 Tank-4

CU 0.30 0.07 0.03 0.0CL 0.10 0.03 0.010 0.010CB 0.30 0.09 0.05 0.001HU 50 30 10 0HL 10 10 0 0WD 20 200 200 700

AmpawilenTank-1 Tank-2 Tank-3 Tank-4

CU 0.35 0.05 0.03 0.0CL 0.12 0.03 0.020 0.010CB 0.25 0.10 0.06 0.001HU 60 30 5 0HL 20 10 0 0WD 10 100 200 700

PinukpukTank-1 Tank-2 Tank-3 Tank-4

CU 0.30 0.08 0.02 0.0CL 0.10 0.05 0.015 0.014CB 0.30 0.15 0.12 0.001HU 50 30 5 0HL 10 10 0 0WD 20 100 100 700

Legend

IV-F43



Figure 4.3.4

JAPAN INTERNATIONAL COOPERATION AGENCYComparison of Flow Duration Curves betweenthe 1987 MP and this Study Periods

Guinalvin

: 1987 MP (1963 - 1984): This JICA Study (1963 - 1998)

Dulao

0

100

200

300

400

500

600

700

800

900

1,000

0 10 20 30 40 50 60 70 80 90 100

Duration (%)

0

100

200

300

400

500

600

700

800

900

1,000

0 10 20 30 40 50 60 70 80 90 100

Duration (%)

0

100

200

300

400

500

600

700

800

900

1,000

0 10 20 30 40 50 60 70 80 90 100

Duration (%)

Minanga

0

100

200

300

400

500

600

700

800

900

1,000

0 10 20 30 40 50 60 70 80 90 100

Duration (%)

Larion Alto

0

100

200

300

400

500

600

700

800

900

1,000

0 10 20 30 40 50 60 70 80 90 100

Duration (%)

Ampawilen

Pinukpuk

0

100

200

300

400

500

600

700

800

900

1,000

0 10 20 30 40 50 60 70 80 90 100

Duration (%)






IV-F44

Magat Dam

18

17

15

19

16

1314

49

50

48

47

38

46

45

37 36

35

34

33

44

32

3130

27

26

42

43

4140 28

39

20

11

29

78

1

2

3

9 4 5

6

22

23

10

12

25

21

24

5152

53

To

anR

iver

Pan

gul R

iver

Tanu

don

Riv

er

Sta. C

ruz Rive

r

Casecnan

River

Dummon River

Zinu

ndun

gan

Riv

er

Paret River

TuguegaraoRiver

Matalag

Rive

r

Chic oRi

ver

Mab aca River

Salta nRive

r Cag

ayan

River

Pasil River

Mal

ligRi

ver

Siff u River

Magat River

Sabo

ngan

Riv

er

T um auini River

Abuan R iver

Catalangan Rive

r

Cag ay

anR

iver

Disbumgan

River

Ibulao River

Da vid

Rive

r

Dibubu

Ri ver

DibuluanR

iver

Ilag

anR

iver

Did

uyo

nR

iver

Addalam River

Kasib

u River

Cad

acl

anR

iver

Basin 5(Upper Chico)

Basin 6(Lower Chico)

Basin 2(Magat)

Basin 4(Lower Cagayan)

Basin 3(Ilagan)

Basin 1(Upper Cagayan)

Pinukpuk Dam

Chico No.4 Dam

Mallig No.2 Dam

Chico No.2Dam

SiffuNo.1(A)

Dam

AlimitNo.1(A)

Dam

MatunoNo.1Dam

Diduyon Dam

CasecnanDam

Cagayan No.2Dam

Cagayan No.1Dam

Addalam(A) Dam

Ilagan No.1Dam

DisabunganDam

0 10 20(km)

Scale

30 40 50

N

Figure 4.4.1

Divided Subbasins for Streamflow Analysis

IV-F45

River System Model for Streamflow Analysis




Figure 4.4.2

1

2

3

5

6

4

9

7

7

6

13

14

15

17

18

19

20020

113

019

018

017

015

014013

108

109

016

110

111

112

8

8

9

16

10

10

029

11

11928

028

30

13

14

15

030

31

031

120

121

122

124

125

126

134

133 132 131 130

129

128

127

40

040041 41

42042

04343

44044

046

4547

48

048049

49

047 045

46135

136

137

123

03333

03434

36036 035 35

37037038

38

39039

051 05050

52052

05353

51

03232

02727 11

011010

107

01212

12

114

115

116

11721

021

11929

105

008

00922

022023

23

24024

25025

26026

001

002101

003102

005 004

004

006

106

007

104

4

5

1

2

3

IlaganNO.1 Dam

Ilagan River

Magat River

Siffu River

Siffu NO.1(A) Dam

Mallig NO.2 Dam

Mallig River

Chico River

ChicoNO.2 Dam

ChicoNO.4 Dam

Pinukpuk Dam

Magat Dam

Casecnan Dam

Diduyon Dam

Addalam(A) Dam

CagayanNO.2 Dam

MatunoNO.1 Dam

AlimitNO.1(A) Dam

CagayanNO.1 Dam

Disabungan Dam

：Subbasin：Dam： Calculation： Point

LEGEND

IV-F46



Figure 4.4.3


Duration Curve of Estimated 10-day Runoff(1963-1998)

Ilagan

0

500

1,000

1,500

2,000

2,500

0 10 20 30 40 50 60 70 80 90 100Duration (%)

Upper Cagayan

0

500

1,000

1,500

2,000

2,500

0 10 20 30 40 50 60 70 80 90 100Duration (%)

Magat

0

500

1,000

1,500

2,000

2,500

0 10 20 30 40 50 60 70 80 90 100Duration (%)

Siffu-Mallig

0

500

1,000

1,500

2,000

2,500

0 10 20 30 40 50 60 70 80 90 100Duration (%)

Chico

0

500

1,000

1,500

2,000

2,500

0 10 20 30 40 50 60 70 80 90 100Duration (%)

Whole Basin

0

500

1,000

1,500

2,000

2,500

0 10 20 30 40 50 60 70 80 90 100Duration (%)

3,000

3,500

4,000

4,500

5,000

5,500

6,000

6,500

7,000

7,500

8,000

8,500

9,000

IV-F47

Basin Model for Water Balance Study




Figure 5.1.1

UC-1

UC-2

UC-3

UC-6A

I-1

I-2

I-3

I-4

UC-7A

UC-9

LC-1

S-2

S-4

S-5

LC-3

LC-3

LC-4A

LC-4B

LC-8

LC-9A

LC-9B

LC-12A

LC-12B

LC-14

LC-13

LC-11

41

41 42

45

45

46

46

(Dummon)

47

47

Zinundungan

(CIADP,Lower Cagayan)

(Zinundungan)

44

27

28

3029

26(Chico west)

(Chico RIS)

ChicoNO.4 Dam

ChicoNO.2 Dam

Pinukpuk Dam

25

2423

22

21

26

31

44

27

48

48

P

Dummon

(Baggao,Pared)

(Baggao,Paranan)

(CIADP,Alcala-Amulung)

(CIADP,Iguig)

(Solana-Tuguegarao Alcala Amulung west)

42

Paranan

40 40

LC-6

LC-7

LC-5

LC-10

C-4

C-1

C-6

C-5

C-3

C-2

(Dabubu)

Transbasin

UC-8B

S-1

S-3

UC-8A

1

1

4

42

23

3

6

7

8

89

9

(Gappal)Gappal10

20

6

17

1716

18

P

1118

P

19

20

IlaganNO.1 Dam

(Ilagan IP)

Disabungan Dam

5

713

13

16

11

10

(Manamtam)

(Bayombong)

(Magat RIS)

MatunoNO.1 Dam

Magat DamAlimit NO.1(A)Dam

12

12

15 14

14

15

21 23

28 30

24

(Mallig)

Mallig NO.2 Dam

(ChicoMallig)22

29

25

34

36

36

3535

37

(Tumauini)

(Pinacanauan)

(Tuguegarao)

P

P

P

P

33 34

32

(San Pablo-Cabagan)

37

38

38

39

39

43

43

31

(Lulutan)Siffu NO.1(A)Dam

(Siffu)

19

5

Addalam(A)Dam

Casecnan Dam

CagayanNO.2 Dam

CagayanNO.1 Dam

UC-4

UC-5

UC-6B

M-2

M-1

M-3

M-5

M-4

Diduyon Dam

：NIS Intake(Gravity)

：NIS Intake(Pump)

：Dam(Some are NIS Intakes)

：Confluence of Tributary

：Municipal Water Demand

；Natural Runoff in Subbasin

：CIS Water Demand

：Return Flow

：Transbasin

Balance Point

Others

LEGEND

PP

IV-F48

Magat Dam

LC-14

LC-13

LC-11

C-6

LC-12BLC

-12B

LC-12ALC

-12A

LC-9A

LC-9B

LC-10

LC-8

LC-7

LC-6

LC-4B LC

-4A

LC-3

LC-5 LC

-2

LC-1

C-4

C-5

C-2

C-3

C-1

S-3

S-4

S-1

S-2

S-5

M-5

M-4

M-3

M-2

M-1

I-4

I-3

I-2

I-1

UC-9

UC-8B

UC-8A

UC-7

UC-6B

UC-6A

UC-3

UC-5

UC-4

UC-2

UC-1

To

anR

iver

Pan

gul R

iver

Tanu

don

Riv

er

Sta. C

ruz Rive

r

Casecnan

River

Dummon River

Zinu

ndun

gan River

Paret R iver

TuguegaraoRiver

Matalag

Rive

r

Chic oRi

ver

Mab aca River

Salta nRive

r Cag

ayan

River

Pasil River

Mal

ligRi

ver

SiffuRiver

Magat River

Sabo

ngan

Riv

er

T um auini River

Abuan River

Catalangan Rive

r

Cag ay

anR

iver

Disbumgan

River

Ibulao River

Da vid

Rive

r

Dibu

bu

River

DibuluanR

iver

Ilag

anR

iver

Did

uyo

nR

iver

Addalam River

Kasib

u River

Cad

acl

anR

iver

Pinukpuk Dam

Chico No.4 Dam

Mallig No.2 Dam

Chico No.2Dam

SiffuNo.1(A)

Dam

AlimitNo.1(A)

Dam

MatunoNo.1Dam

DiduyonDam

CasecnanDam

Cagayan No.2Dam

Cagayan No.1Dam

Addalam(A) Dam

Ilagan No.1Dam

DisabunganDam

0 10 20(km)

Scale

30 40 50

N

Figure 5.1.2

Divided Subbasins for Water Balance Study

IV-F49

0

50

100

150

200

250

300

350

1975 1980 1985 1990 1995 2000 2005 2010Year

0

2

4

6

8

10

12

14

Projected Dead Space : 300 million cu.m

Annual Sediment Rate

Accumulated Sediment Volume

Earthquake occurred in 1990

Completion of Dam

(Projected Annual Sediment Rate : 5.5 million cu.m)

Source : NIA,Region II Office

Pasonglao (Chico River)

10

100

1,000

10,000

100,000

10 100 1,000

Water Discharge, Qw (m3/sec)

Oscariz (Magat River)

1

10

100

1,000

10,000

100,000

1,000,000

10,000,000

10 100 1,000 10,000Water Discharge, Qw (m3/sec)

Dipadiw (Cagayan River)

1

10

100

1,000

10,000

100,000

10 100 1,000

Water Discharge, Qw (m3/sec)

Rating Curve Estimated in the 1987 MP

Sediment Data Collected in the 1987 MPSediment Data Collected in this JICAStudy

Rating Curve Estimated in this JICA Study

Qs = 0.0025 Qw2.76

Qs = 0.03 Qw2.27

Qs = 0.00022 Qw3.29

Qs = 0.0004 Qw3.17


Sediment Data Collected in the 1987 MP


Sediment Data Collected in the 1987 MP



Figure 6.5.1

Annual Sediment Transport

Cagayan River

0

5

10

15

20

25

30

0

5

10

15

20

25

30Chico River

0

5

10

15

20

25

30

Siffu River

Ilagan River

Magat River

5.626.34

4.995.48

7.79

5.53 5.014.43

6.87

22.89

11.04

6.41

3.99 0.90

0.85 0.10 0.26 0.90

Annual Bed Material Load

Annual Wash Load

Average Annual Bed Material Load

Average Annual Wash Load

Legend

IV-F52



Figure 7.1.1General Work Flow of Riverbed FluctuationAnalysis

Evaluation of the Stability of thePresent River Stretch

River Cross Sectionand Profile DataMeasured in 2000

Note Case-0 : Natural Condition (without project implementation) Case-1 : Widening Tupang Site to 500 m Case-2 : Widening Tupang and Nassiping Sites to 500 m Case-3 : Widening Tupang, Nassiping and Magapit Sites to 500 m Case-4 : Widening Tupang, Nassiping and Magapit Sites to 700 m Case-5 : Construction of 3 Cut-off Channels (Gabut, San Isidro and Tuguegarao)

10-day RunoffData

10-day WaterLevel Data atAparri

Grain SizeDistribution DataMeasured in 2000

Long Term RiverbedFluctuation Analysis forNatural Condition (Case-0)*

Short Term RiverbedFluctuation Analysis forNatural Condition (Case-0)*

Flood RunoffData (2-yr)

Water LevelData at Aparri

Grain SizeDistribution DataMeasured in 2000

Long Term Riverbed Fluctuation Analysisfor Each Implementation Case (Case-1 ~Case-5)*

Evaluation of the Influence on theFuture Riverbed Fluctuation byEach Implementation Scheme

10-day RunoffData

10-day WaterLevel Data atAparri

River Cross Section andProfile Data for 5Implementation Scheme

IV-F53



Figure 7.4.1Result of Short-term Riverbed FluctuationAnalysis for Natural Condition (Case-0)

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180

Distance from the River Mouth (km)

(1) Flood Hydrograph for Objective Stretch (2 yr Probable Flood)

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

0 24 48 72 96 120 144 168 192 216

Time (hour)

Peak : 6,400 m3/sec

(2) Riverbed Change

Riverbed in the Year 2000

Riverbed Change

IV-F54

After 5 Years

Riverbed ElevationMeasured in 2000Estimated RiverbedElevation

After 10 Years

-8

-6

-4

-2

0

2

4

6

8

10

12

14

16

18

20

Distance from the River Mouth (km)0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180

-8

-6

-4

-2

0

2

4

6

8

10

12

14

16

18

20


-4

-2

0

2

4

6

8

10

12

14

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180



Riverbed ElevationMeasured in 2000Estimated RiverbedElevation-2.4 m ('00) -1.1 m ('00)

7.2 m ('00)

13.2 m ('00)

-2.6 m (After 10 yrs.)


7.3 m (After 10 yrs.)


Riverbed ElevationMeasured in 2000Estimated RiverbedElevation-2.4 m ('00)


-1.1 m ('00)


7.2 m ('00)


13.2 m ('00)13.4 m (After 5 yrs.)

-4

-2

0

2

4

6

8

10

12

14

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180


After 25 Years After 50 Years

-8

-6

-4

-2

0

2

4

6

8

10

12

14

16

18

20



-4

-2

0

2

4

6

8

10

12

14

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180


-2.4 m ('00) -1.1 m ('00)

7.2 m ('00)

13.2 m ('00)






-4

-2

0

2

4

6

8

10

12

14

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180


Riverbed ElevationMeasured in 2000Estimated RiverbedElevation-2.4 m ('00) -1.1 m ('00)

7.2 m ('00)

13.2 m ('00)





-8

-6

-4

-2

0

2

4

6

8

10

12

14

16

18

20



Difference of the Riverbed Elevation between Natural Conditionand Case-1 (after 10 Years)

-3

-2

-1

0

1

2

3

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180Distance from the River Mouth (km)

Estimated Riverbed Elevation after 10 Years

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180



-10

-5

0

5

10

15

20

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180


-10

-5

0

5

10

15

20

Stretch to be Widen to 500 m Stretch to be Widen to 500 m


-3

-2

-1

0

1

2

3



Riverbed Elevation with Natural Condition


Natural Condition

With ChannelWidening Case-1

Natural Condition


(Tupang Site)

(Tupang Site) (Tupang Site)

(Tupang Site)

Affected ReachesAffected Reaches


-3

-2

-1

0

1

2

3



0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180



-10

-5

0

5

10

15

20

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180


-10

-5

0

5

10

15

20


-3

-2

-1

0

1

2

3






(T)(N)

Natural Condition


(T) Tupang Site

(N) Nassiping Site

Natural Condition


(T) Tupang Site

(N) Nassiping Site

(T)(N)

Tupang Site

Nassiping Site

(T)

(N)(T)(N)(T)(N)

Tupang Site

Nassiping Site

(T)

(N)

Affected Reaches Affected Reaches


-3

-2

-1

0

1

2

3



0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180



-10

-5

0

5

10

15

20

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180


-10

-5

0

5

10

15

20


-3

-2

-1

0

1

2

3


Stretch to be Widen to 500 m






(T)(N)

Natural Condition


(T) Tupang Site

(N) Nassiping Site

(M) Magapit Site

(M)

(T)(N)(M)

(T) Tupang Site

(N) Nassiping Site

(M) Magapit Site

Affected Reaches

(T) Tupang Site

(N) Nassiping Site

(M) Magapit Site

Natural Condition


(T) Tupang Site

(N) Nassiping Site

(M) Magapit Site

(T)(N)(M)

(T)(N)(M)

Affected Reaches


-3

-2

-1

0

1

2

3



0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180



-10

-5

0

5

10

15

20

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180


-10

-5

0

5

10

15

20


-3

-2

-1

0

1

2

3


Natural Condition


Natural Condition







Affected ReachesAffected Reaches

Difference of the Riverbed Elevation between the Cases With and Without 3 Cut-offChannels (after 10 Years)

-3

-2

-1

0

1

2

3

Estimated Riverbed Elevation after 10 Years Estimated Riverbed Elevation after 50 Years

-10

-5

0

5

10

15

20

-10

-5

0

5

10

15

20

-3

-2

-1

0

1

2

3

Without 3 Cut-off Channels(Natural Condition)

With 3 Cut-off Channels

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160


0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160


Difference of the Riverbed Elevation between the Cases With and Without 3 Cut-offChannels (after 50 Years)

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160


Without 3 Cut-off Channels(Natural Condition)

With 3 Cut-off Channels

Tuguegarao Cut-offChannel Tuguegarao Cut-off

Channel

San Isidro Cut-off ChannelSan Isidro Cut-off Channel

Gabut Cut-off Channel Gabut Cut-off Channel

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160


Tuguegarao Cut-offChannel Tuguegarao Cut-off

Channel

San Isidro Cut-off Channel San Isidro Cut-off Channel

Gabut Cut-off Channel Gabut Cut-off Channel

Riverbed Elevation without 3 Cut-off Channels Riverbed Elevation without 3 Cut-off Channels



Figure 8.5.1Basic Concept and Equations of SalineWater Intrusion Analysis

Sea River

RiverMouth

Lx

U0

U1 = 0

Fresh Water

Saline Wateri = 0

0

HxfFFFF i

dddd 2101

4131

21

41

51 3/2

03/2

032

042

0(a)

3/40

3/20

20 5

63251

2ddd

i

FFFf

HL (b)

Where,H : Water depth at the tip of wedge (m)

(=h1/H) : Ratio of fresh water depth to total water depthFd0 (=U0/( gH)1/2) : Density Froude number

if : Average resistance factor along the wedge

h1 : Depth of fresh water (m)U0 : Average current velocity at the tip of wedge (m/sec)G : Acceleration of gravity (=9.8 m/sec2) (=( 2- 1)/ 2) : Relative difference of density1 : Density of fresh water (=1.000 g/cm3)2 : Density of saline water (=1.025 g/cm3)

Basic Equations

IV-F62



Figure 8.5.2General Flowchart of Saline WaterIntrusion Analysis

Results of Lowflow Analysis

Target Runoff (Qt)

River Profile and Cross-section Survey Result in2000

Average Current Velocity ofFresh Water (U0) for theTarget Runoff

Estimated Length and Shapeof the Wedge for the TargetRunoff

Basic Equations

Estimation ofAffected Stretch forthe Target Runoff

Non-uniform flowCalculation

Calculation of theLength and the

Shape of the Wedge

IV-F63

-30

-20

-10

0

10

0 10 20 30 40 50 60

QQminQ95Qd_5yr

Q75Q50

Qob

Deepest Riverbed


Ordinary W.L.Tide Level= 0.71 m

Calculated salt water wedgeCalculated salt water wedge incase of no topographical barrier

Symbol m3/sec Description1 Qmin 137 Minimum 10-day runoff simulated from rainfall record (1963~1998)2 Qd_5yr 173 5-yr probable drought runoff (10-day)3 Q95 207 95% dependable 10-day runoff4 Q75 416 75% dependable 10-day runoff5 Q50 949 50% dependable 10-day runoff6 Qob 1,606 Observed runoff in this Study (Jan. 10~11, 2001)

Babuyan Channel

Dummon R.

Cag

ayan

R.

Pared R.

Chico

R. Tuguegarao R. SI

ER

RA

MA

DR

E M

OU

NTA

INS

SIE

RR

A M

AD

RE

MO

UN

TAIN

S

Pinacanauan R.

Tumauini R.

Cag

ayan

R.

Magat

R.

Ilag

an R

.

Siffu R.

Mall

ig R.

CO

RD

ILLE

RA

MO

UN

TAIN

S

Addalam R.

Mag

at R

.

Cag

ayan

R.

Cag

ayan

R.

0 10 20 30 40 50 kmScale

Inundation Area Map (1/3, Nov.1973 Flood)

N

River Course

RoadBasin Boundary

Inundation Area(Nov.1973 Flood)

Subbasin of MajorTributary

LEGEND

Source: FINAL REPORT FOR THE MASTER PLAN STUDYON THE CAGAYAN RIVER BASIN WATER RESOURCESDEVELOPMENT / SUPPORTING REPORT/ AUGUST 1987




Figure 9.1.1

IV-F65

Babuyan Channel

Dummon R.

Cag

ayan

R.

Pared R.

Chico

R. Tuguegarao R. SI

ER

RA

MA

DR

E M

OU

NTA

INS

SIE

RR

A M

AD

RE

MO

UN

TAIN

S

Pinacanauan R.

Tumauini R.

Cag

ayan

R.

Magat

R.

Ilag

an R

.

Siffu R.

Mall

ig R.

CO

RD

ILLE

RA

MO

UN

TAIN

S

Addalam R.

Mag

at R

.

Cag

ayan

R.

Cag

ayan

R.

0 10 20 30 40 50 kmScale

Inundation Area Map (2/3, Nov.1980 Flood)

N

River Course

RoadBasin Boundary

Inundation Area(Nov.1980 Flood)


LEGEND

Source: FINAL REPORT FOR THE MASTER PLAN STUDYON THE CAGAYAN RIVER BASIN WATER RESOURCESDEVELOPMENT / SUPPORTING REPORT/ AUGUST 1987




Figure 9.1.1

IV-F66

Babuyan Channel

Dummon R.

Cag

ayan

R.

Pared R.

Chico

R. Tuguegarao R. SI

ER

RA

MA

DR

E M

OU

NTA

INS

SIE

RR

A M

AD

RE

MO

UN

TAIN

S

Pinacanauan R.

Tumauini R.

Cag

ayan

R.

Magat

R.

Ilag

an R

.

Siffu R.

Mall

ig R.

CO

RD

ILLE

RA

MO

UN

TAIN

S

Addalam R.

Mag

at R

.

Cag

ayan

R.

Cag

ayan

R.

0 10 20 30 40 50 kmScale

Inundation Area Map (3/3, Oct.1998 Flood)

N

River Course

RoadBasin Boundary

Inundation Area(Oct.1998 Flood)


LEGEND

Source: OCD Region II Office and Interview Survey by the Study Team




Figure 9.1.1

IV-F67



Figure 9.2.1Location of Cross-sections and the Pointswith Runoff Hydrograph

TG 13+000

1

2

3

4

5

6

78

9

25-yr Flood Runoff Hydrograph

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

0 24 48 72 96 120 144 168 192 216

Time (hour)

Runo

ff (m

3 /sec)

1

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

0 24 48 72 96 120 144 168 192 216

Time (hour)Ru

noff

(m3 /se

c)

2

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

0 24 48 72 96 120 144 168 192 216

Time (hour)

Runo

ff (m

3 /sec)

3

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

0 24 48 72 96 120 144 168 192 216

Time (hour)

Runo

ff (m

3 /sec)

4

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

0 24 48 72 96 120 144 168 192 216

Time (hour)

Runo

ff (m

3 /sec)

5

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

0 24 48 72 96 120 144 168 192 216

Time (hour)

Runo

ff (m

3 /sec)

6

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

0 24 48 72 96 120 144 168 192 216

Time (hour)

Runo

ff (m

3 /sec)

7

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

0 24 48 72 96 120 144 168 192 216

Time (hour)

Runo

ff (m

3 /sec)

8

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

0 24 48 72 96 120 144 168 192 216

Time (hour)

Runo

ff (m

3 /sec)

9

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

0 24 48 72 96 120 144 168 192 216

Time (hour)

Runo

ff (m

3 /sec)

10

10

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

0 24 48 72 96 120 144 168 192 216

Time (hour)

Runo

ff (m

3 /sec)

1111

IV-F68



Figure 9.2.2

General Procedure of Flood Inundation Analysis

River Profile and Cross-section Data Measured in2000 (Topographic Dataof Low Water Channel)

1:10,000 and 1:25,000Topographic Maps(Topographic Data ofLow Water Channel)

DEM (Digital ElevationModel) data of the FloodPlain

Average Elevation of Each1 km x 1 km Mesh

Flood Runoff Hydrograph of 11Points Obtained by Storage

Function Method (2, 5, 10, 25, 50and 100 Probable Floods)

1-D Non-uniformFlow Calculation

Water Level of EachSection at the time of “t”

t = tend ?No

ttt ∆+=

0tt =

Decision of Reference Cross-section for Each Mesh

Yes

Maximum Inundation Depth of Each MeshDuration of Flood Inundation of Each Mesh

Time

F.W.L. of theReference Section

Average Elevation of a Mesh

Duration of Flood Inundation

Flood Level Hydrograph ofEach Cross-section

Calibration

River Profile and Cross-section Data Including

Flood Plain

Flood Marks of PastEvents

IV-F69

0

10

20

30

40

0 20 40 60 80 100 120 140 160 180

Distance from River Mouth (km)

Calibrated Water Level of 1980 Flood

Flood Mark of 1980 Flood

Legend



Figure 9.3.1


Simulated Maximum Inundation Depth(100-yr Probable Flood)

Aparri

Lal-loMagapit

Gattaran

Nassiping

Alcala

Amulung

Iguig

Tuguegarao Enrile

Namabbalan

Solana

Tuao

Cabagan

0 5 10 20(km)

Scale

N

Legend

Maximum Inundation Depth

: 2 m or more

: 1 m or more

: Less than 1 m

: River Course

: Basin Boundary

: Road

: Bridge

: City / Town

Santa Maria



Figure 9.3.2



Aparri

Lal-loMagapit

Gattaran

Nassiping

Alcala

Amulung

Iguig

Tuguegarao Enrile

Namabbalan

Solana

Tuao

Cabagan

0 5 10 20(km)

Scale

N

Legend


: 2 m or more

: 1 m or more

: Less than 1 m

: River Course

: Basin Boundary

: Road

: Bridge

: City / Town

Santa Maria



Figure 9.3.3



Aparri

Lal-loMagapit

Gattaran

Nassiping

Alcala

Amulung

Iguig

Tuguegarao Enrile

Namabbalan

Solana

Tuao

Cabagan

0 5 10 20(km)

Scale

N

Legend


: 2 m or more

: 1 m or more

: Less than 1 m

: River Course

: Basin Boundary

: Road

: Bridge

: City / Town

Santa Maria



Figure 9.3.4



Aparri

Lal-loMagapit

Gattaran

Nassiping

Alcala

Amulung

Iguig

Tuguegarao Enrile

Namabbalan

Solana

Tuao

Cabagan

0 5 10 20(km)

Scale

N

Legend


: 2 m or more

: 1 m or more

: Less than 1 m

: River Course

: Basin Boundary

: Road

: Bridge

: City / Town

Santa Maria



Figure 9.3.5



Aparri

Lal-loMagapit

Gattaran

Nassiping

Alcala

Amulung

Iguig

Tuguegarao Enrile

Namabbalan

Solana

Tuao

Cabagan

0 5 10 20(km)

Scale

N

Legend


: 2 m or more

: 1 m or more

: Less than 1 m

: River Course

: Basin Boundary

: Road

: Bridge

: City / Town

Santa Maria



Figure 9.3.6



Aparri

Lal-loMagapit

Gattaran

Nassiping

Alcala

Amulung

Iguig

Tuguegarao Enrile

Namabbalan

Solana

Tuao

Cabagan

0 5 10 20(km)

Scale

N

Legend


: 2 m or more

: 1 m or more

: Less than 1 m

: River Course

: Basin Boundary

: Road

: Bridge

: City / Town

Santa Maria



Figure 9.3.7


Simulated Inundation Period(100-yr Probable Flood)

Aparri

Lal-loMagapit

Gattaran

Nassiping

Alcala

Amulung

Iguig

Tuguegarao Enrile

Namabbalan

Solana

Tuao

Cabagan

0 5 10 20(km)

Scale

N

Legend

Flood Inundation Period

: 7 days or more

: 3 days or more

: Less than 3 days

: River Course

: Basin Boundary

: Road

: Bridge

: City / Town

Santa Maria



Figure 9.3.8



Aparri

Lal-loMagapit

Gattaran

Nassiping

Alcala

Amulung

Iguig

Tuguegarao Enrile

Namabbalan

Solana

Tuao

Cabagan

0 5 10 20(km)

Scale

N

Legend


: 7 days or more

: 3 days or more

: Less than 3 days

: River Course

: Basin Boundary

: Road

: Bridge

: City / Town

Santa Maria



Figure 9.3.9



Aparri

Lal-loMagapit

Gattaran

Nassiping

Alcala

Amulung

Iguig

Tuguegarao Enrile

Namabbalan

Solana

Tuao

Cabagan

0 5 10 20(km)

Scale

N

Legend


: 7 days or more

: 3 days or more

: Less than 3 days

: River Course

: Basin Boundary

: Road

: Bridge

: City / Town

Santa Maria



Figure 9.3.10



Aparri

Lal-loMagapit

Gattaran

Nassiping

Alcala

Amulung

Iguig

Tuguegarao Enrile

Namabbalan

Solana

Tuao

Cabagan

0 5 10 20(km)

Scale

N

Legend


: 7 days or more

: 3 days or more

: Less than 3 days

: River Course

: Basin Boundary

: Road

: Bridge

: City / Town

Santa Maria



Figure 9.3.11



Aparri

Lal-loMagapit

Gattaran

Nassiping

Alcala

Amulung

Iguig

Tuguegarao Enrile

Namabbalan

Solana

Tuao

Cabagan

0 5 10 20(km)

Scale

N

Legend


: 7 days or more

: 3 days or more

: Less than 3 days

: River Course

: Basin Boundary

: Road

: Bridge

: City / Town

Santa Maria



Figure 9.3.12



Aparri

Lal-loMagapit

Gattaran

Nassiping

Alcala

Amulung

Iguig

Tuguegarao Enrile

Namabbalan

Solana

Tuao

Cabagan

0 5 10 20(km)

Scale

N

Legend


: 7 days or more

: 3 days or more

: Less than 3 days

: River Course

: Basin Boundary

: Road

: Bridge

: City / Town

Santa Maria



Figure 10.1.1

JAPAN INTERNATIONAL COOPERATION AGENCYComparison of 25-yr Flood Hydrographs

BP-1

0

6,000

12,000

18,000

24,000

30,000

0 24 48 72 96 120 144 168 192 216

Time (hour)

BP-2

0

6,000

12,000

18,000

24,000

30,000

0 24 48 72 96 120 144 168 192 216

Time (hour)

BP-1

0

6,000

12,000

18,000

24,000

30,000

0 24 48 72 96 120 144 168 192 216

Time (hour)

BP-2

0

6,000

12,000

18,000

24,000

30,000

0 24 48 72 96 120 144 168 192 216

Time (hour)

(1) Comparison of Calculated Flood Hydrograph (25-yr) between with Storage Function Value of 1987 MP and this JICA Study

(2) Comparison of Calculated Flood Hydrograph (25-yr) between Present Condition and the Condition with Project Implementation

This JICA Study

1987 MP

1987 MP

This JICA Study

With Project

Without Project

With Project

Without Project

IV-F83

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