M ajor Cause and C onstraint

Structural M easures

Non-Structural M easures

Supporting M easures

C o unterm easure s to achie ve; 1. Prote ctio n of C asualty and Assets 2. Increase of A gricultural Products

Natural Cause (1) (River Channe l )1. Ex t ensive f lood p lain2 . B ack water due to con strict ed sect ion s in the Magapit narroe s 3 . Se dimentation 4 . B ank erosion due to so f t riverb ank

Fl ood Control Problem 1 . Damage o f casualty an d asset s 2. Low agricult ural p r oduc t

Natural Cause (2)1. Co nce nt rat ed rainfall br o ught by t y pho on 2 . Poo r v egetation

Soci al an d Economi c Cons traint1. Shortage of budge t2. Lack of overall plan and implementat ion schedule3. Lac k of integrated organization and c apabilit y

Widening of Bottl e ne cks1. Lo wer in g o f floo d wate r lev el2. Decre ase o f in undat ion depth an d d urat io n in t he upst ream

Embankm ent1 . Decrease o f inun dation are a a nd cr eation o f n ew land 2. Co nt ribut e as rur al road

Bank Protection Works 1 . Stabilize low wate r ch ann el

Strengthening of Institution and @ @ Or ganization

1 . Str en gthen in g of f unding 2 . Insti t utiona l im prov emen t 3. Or ganizat ion al improv emen t 4 . C apa cit y b uilding 5. Awaren ess education

Non-structural Me asures

1. Wa ter sh ed managemen t 2. Disaster managemen t system 3. Reset tlemen t

H ig h V ulnerability a gainst D isaster

1 .C as ualty2 .Los s of a sse ts3 .Low prod uctivity

Mul ti purpose Dam 1. Decrease o f floo d p eak 2. Supp ly water for irr igation d ev't

Flood Dike (Embankment) and Riverbank Tree Zone

Design High Water Level

Dike DimensionsDesign Discharge Free Board Top Width

(cu.m/s) (m) (m)

5,000 to 10,000 1.5 6

more than 10,000 2 7

Riverbank Tree Zoneto form natural levee ( andprotect earth dike)(by Bamboo, Tree, etc.)

Top Width

FreeBoard

Boundary of Administrative River Zone

Note;

Purpose of Riverbank Tree Zone;

1. To reduce velocity2. To form natural levee by siltation3. To protect dike from scouring due to flood flows

Dike

Low Water Channel

Drain

Siltation afterpassing through theriverbank tree zone(year by year)

Dike constructionfinally by additionalembankment

Source : The Master Plan Study on the Cagayan River Basin Water Resouce Development, Supporting Report Aug. 1987 by JICA (page;FC-131)

17,900(15,900)[25,400]

16,900(17,800)[24,600]

17,700(18,700)[25,600]

5,900(7,700)[9,100]

15,600(16,300)[23,100]

10,000(10,700)[15,100]

Siffu No.1(A) Dam Vol : 96.1 mcm Rout 0.10

Mallig No.2 Dam Vol : 93.4 mcm Rout 0.10

Magat Dam Vol : 200 mcm Rout 0.638

Cagayan No.1 Dam Vol : 318 mcm Rout 0.683

Ilagan No.1 Dam Vol : 382 mcm Rout 0.10

900(1,400)[1,100]

900(6,100)[1,200]

4,800(6,900)[7,000]

Cagayan River

Ilagan River

Cagayan River

Mallig R.

LEGEND Flood Discharge (m3/s)

10,000(10,700)[15,100]

: Long-term Plan (25yr): Existing (25yr): Framework Plan (100yr)

Maagapita

Nassipin

Alcala

Chico River

← Cagayan River

Case-4 Tupang + Nassiping + Magapit Site (W=500m)

Case-5 Tupang ~ Magapit Site (W=700m)

Case-3 Tupang + Nassiping Site (W=500m)

Case-2 Tupang Site (W=500m)

( Case-1 Without widening )

Tupang Sitep g

Nassiping Sitep g

Magapit Siteg p

m30km

30km

3

5km3535335

m

Th

e F

ea

sib

ility S

tud

y o

f the F

lood

Co

ntro

l Pro

ject

for th

e L

ow

er C

agayan R

iver

in th

e R

epublic

of th

e P

hilip

pin

es

JA

PA

N IN

TE

RN

AT

ION

AL

CO

OP

ER

AT

ION

AG

EN

CY

Fig

ure 7

.4.3L

oca

tion

Map

of B

ottlen

ecks

in th

e Magap

it Narro

ws

0 1 2 kmW=500m

W=700m

Channel

Magat Dam (Existing)

Babuyan Channel

Dummon River

Pared River

Chi

co R

iver

Tuguegarao River

SIER

RA

MA

DR

E M

OU

NTA

INS

SIER

RA

MA

DR

E M

OU

NTA

INS

PinacanauanRiver

Tumauini River

Caga

yan

Rive

r

Ilaga

n Riv

er

Siffu River

Mallig River

CORD

ILLE

RA M

OUNT

AINS

Adda

lam R

iver

Caga

yan

Rive

r

Cagay

an R

iver

Magat River

Gabut COC

San Isidro COC

Tuguegarao COC

Alcala-Buntun Dike

Enrile Dike

Siffu Dike

Tuguegarao Dike

Lower Reach Dike

Siffu No.1 Dam

:Proposed schemes in the Reviewed Long-term Plan including cut-off channels in tributaries, bank protection works at 73 sites in the basin wide, and non-structural measures (evacuation system and resettlement area development).

Mallig No.2 Dam

Alimit No.1 Dam

Matuno No.1 Dam

Magat DikeUpper Reach Dike

Cagayan No.1 Dam

Ilagan No.1 Dam

Middle Reach Dike

Ilagan Dike

Aparri

Alcala

Tuguegarao

Ilagan

Cabagan

0 10 20 30 40 50 kmScale

N

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

in the Republic of the PhilippinesJAPAN INTERNATIONAL COOPERATION AGENCY

River Course

Diking systemBasin Boundary

LEGEND

Hilly land

Dam reservoir

F74

Long Term Plan of Flood Control in the Cagayan River Basin

Figure 7.4.4

Cut-off Channel

100m

6m

500m

1:3 1:3

1:3 1:3

100m

2m

7m

1:3HWL 1:31:3

Dike construction

(finally by additional

embankment)

Siltation after

passing through the

riverbank tree zone

(year by year)

Drain

Riverbank Tree Zone

to form natural levee (and

protect earth dike)

(by Bamboo, Tree, etc.)

Flood Dike (Embankment) with Riverbank Tree Zone

uguegarao dike

=14.3km

Alcala-Buntun dike

Gabut cut-off channel

Drainage culvert for tributary

6 gates x 1.5m x 1.5m

Tuguegarao cut-off channelEnrile dike

L=4.6km

San Isidr

National High

Th

e F

ea

sib

ility S

tud

y o

f the F

loo

d C

on

trol P

roje

ct

for th

e L

ow

er C

agayan R

iver

in th

e R

epublic

of th

e P

hilip

pin

es

JA

PA

N IN

TE

RN

AT

ION

AL

CO

OP

ER

AT

ION

AG

EN

CY

Fig

ure 7

.4.5

Loca

tion

Map

of R

eview

ed F

lood

Con

trol

Lon

g-term

Pla

n (fro

m A

lcala

to T

ugu

egara

o)

0 1 2 km

Babu

yan

Ch

an

nel

Dum

m Pa

Chico R.

R.

Pina

cana

uan

RR

Pi

N

Ap

arr

i

Cab

agan

Alc

ala

Cagayan R.

Tu

gu

eT

ugu

ugu

egara

oegg

au

gu

e

Tugu

eg

Tugu

e

Aparri

Lollo

Ballesteros

Alcala

Tuao

Connor

Baggao

Solana

Tuguegarao

PinukpukEnrile

Allacapan

Lasam Gattaran

Santo Nino

Rizal

Piat

Iguig

Amulung

Balbalan

Tabuk

RizalSanta Maria San Pablo

CabaganSanto Tomas

Magsay

TumauiniQuezon

Paracelis

Natonin

Pasil

Lubuagan

Tinglayan

Sadanga

Bontoc

Bauko

BesaoSagada

Sabangan

Tonudan

Hungduan

Mayoyao

Banaue

Kiangan

Lagawe

Lamut Diadi

Villa Verde

Bagabag

Bambamg

QuezonBayombanc

Ambogula

Solano

Kayapa

Aritao Dupax Del Norte

Santa Fe

Duupax Del Sur

Kasibu

Gamu

Roxas

QuilingIligan

Mallig

San ManuelBurgos

Naguilian

Cabatuan

LunaAurora

Reina MercedesSan Mariano

Benito Soliven

Ramon

San Mateo

Cauayan

AngadananSan Guillermo

Alicia

San Isidro

Santiago

Cordon

Diffun

Echague

Cabarrpgios

Ssaguday

Jones

San Agustin

Maddela

Aglipay

Dilalongan

Cosigurar

Dilasag

Palana

Divilacan

Moconacon

Baguey

Santa Teresita Gonzaga

ChicoRiver

Paret

River

Pina ca nauanRive r

CagayanRiver

IlaganRiver

C agayanRiver

Rapids RiverCaga y

anRive

r

CasignanRiver

Mag

at

River

CagayanRive

r

N

10 0 10 20 30 40 50km

SCALE

122°00'121° 121°30′

18°00'

17°30′

17°00'

16°30′

16°00'

122°00'121°00' 121°30′

18°00'

17°30′

17°00'

16°30′

16°00'

Legend

Flood Prone Area

River Bank Erosion

Soil Erosion

Figure 7.5.1

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

in the Republic of the PhilippinesJAPAN INTERNATIONAL COOPERATION AGENCY

Figure 8.2.1 Long Term Plan of Reforestation � in the Cagayan River Basin

Chico River Basin

Forest

Compart

mentTotal Area

Area over

18%Total Area

Area over

18%

401 752 263 400 241 4

402 527 158 295 121 37

403 851 545 567 408 95

404 165 154 155 154 0

405 997 847 770 749 100

406 1,004 261 213 50 208

407 461 148 97 5 138

632

408 705 71 115 21 49

Forest

Compart

mentTotal Area

Area over

18%Total Area

Area over

18%

501 884 504 437 274 203

502 917 881 881 854 28

503 509 270 231 163 80

504 580 551 540 528 23

506 372 372 342 338 33

507 676 608 522 507 99

508 368 357 353 353

27

0

27

0

0

2

0 4

510 379 345 232 231 0 114

584

Land (km2)

Forest

Compart

mentTotal Area

Area over

18%Total Area

Area over

18%

601 418 4 85 0 4

603 1,487 997 600 444 528

604 455 268 122 77 191

605 537 494 370 356 138

606 499 439 454 429 10

607 899 845 691 683 147

608 857 668 575 454 207

Land (km2)

Forest

Compart

mentTotal Area

Area over

18%Total Area

Area over

18%

701 3,249 2,501 2,596 2,371 18

18

Land (km2)

Forest

Compart

mentTotal Area

Area over

18%Total Area

Area over

18%

409 1,027 236 191 21 210

505 574 402 424 327 75

509 450 405 371 346 53

Total

Total

Total

TotalTotal

338

Land (km2)

Forest

Compart

mentTotal Area

Area over

18%Total Area

Area over

18%

410 526 184 197 32 148

411 550 0 154 0 0

412 511 0 137 0 0

413 638 191 444 166 26

602 963 250 484 164 36

801 327 324 325 324 0

802 2,310 2,033 2,174

1,226

1,901 130

901 860 731 796 678 52

Total 392

Land (km2) Present Forest (km

2)

Land (km2)

Present Forest (km2)

Present Forest (km2)

Present Forest (km2) Present Forest (km

2)

Present Forest (km2)

0

23

0

0

0

15

7

4

0

0

0

51

0

1

0

112

6

0

5

19

0

41

0

0

2

5

0

Agri-�cultural

Land over18% in Slope

Proposed�Refores-

tationArea

Agri-�cultural

Land over18% in Slope

Proposed�Refores-

tationArea

Agri-�cultural

Land over18% in Slope

Proposed�Refores-

tationArea

Agri-�cultural

Land over18% in Slope

Proposed�Refores-

tationArea

Agri-�cultural

Land over18% in Slope

Proposed�Refores-

tationArea

Agri-�cultural

Land over18% in Slope

Proposed�Refores-

tationArea

N

401

10 0 10 20 30 40 50 km

SCALE

604

507508

501

502

504503

506

509

402

401

403

404

406

405

407

408

409

701410

411

603

602

412

608

607

606

510

605601

413

801

802

901

505

F77

N

0 10 20(km)

Scale

30 40 50

RiverBasin BoundarySub-basin Boundary

Legend

Required Number of Sabo Dams

No

Sub-Basin NumberNo

Magat Dam

Pang

ul R

iver

Tanu

don

Rive

r

Sta. C

ruz Rive

r

Casecnan River

Dummon River

Zinundu ng

an R

iver

Paret River

Tuguegarao River

Matal ag River

Chi co R

iver

Ma baca Rive r

Salta n Rive

r Cagayan

Rive

rPasil River

Mallig

Rive

r

Siff u River

Magat River

Sabo

ngan

Riv

er

Tum auini R i ver

Abuan Rive

r

Catalangan R

iver

Cag ay

an R

iver Disbumgan River

Ibulao River

Da vid R

iver

Dib

uluan Riv er

Dibuluan River

Ilaga

n Ri

ver

Diduyo

u Ri

ver

Addalam

River

Kasib u River

Cad

a cla

n R

iver

18

17

15

19

16

1314

49

50

48

47

38

46

45

37

36

35

34 33

4432

31

30

27

26

42

4341

40 28

39

20

11

29

78

1

2

3

9

4 5

622

23

10

12

25

21

24

1

4

10

3

1

7

Figure 8.3.1

The Feasibility Study of the Flood Control Project

for the Lower C

agayan Riverin the Republic of the Philippines

JAPA

N IN

TERN

ATION

AL C

OO

PERATIO

N A

GEN

CY

Long Term

Plan of Land U

se in theC

agayan River B

asin

Figure 9.1.1

Present Condition SAFDZ as target Proposed Land Use in Long Term Plan and Reviewed Master Plan up to 2020

Basin

64,200

40,900

472,500

66,600

Corn field

Built-up area

274,200

200

11,900

2,728,100

849,100Basin

Others

1,097,500

Agro-Forestry

Corn field

528,000

(Unit：ha)

34,600

52,100

2,728,100

Kaingin

Fishpond

221,200

0

Built-up area

Fishpond235,100 13,900

Paddy field

152,700

Wild Grasses

(277,600)

(153,300)

Grassland324,700

105,100

Others

Agro-Forestry

113,800676,400

Other field

1,386,800

63,600

108,400

Pastures

KainginForest

Forest

Shrubs

Grasses471,400

Grassland

Paddy field

Agriculture676,400

Shrubs

Agriculture

103,500

137,300

Pastures

Other field

2. Livestock (Ls)153,300

4. Cr/Ls24,300

1. Crop (Cr)626,700

3. Fishery (Fs)13,400

5. Cr/Fs30

7. Fs/Ls450

6. Cr/Ls/Fs150

8. RemainingNPAAAD194,300

9. Agro-Forestry 277,600

10. Watershed/Forestry1,386,800

11. Built-up areas52,100

Source: Present condition and SAFDZ=SAFDZ data 1999 BSWM

Presented area is for the long term and reviewed master plan, except pastureand agro-forestry, where figure of long term plan is in the frame and that of thereviewed master plan is in the parenthesis.

Note:

F79

N

Legend

NIS and Major CIS

NIP and Major CIP

On-going NIP

Irrigation Scheme

Figure 9.3.2Irrigation Development Schemein Long Term Plan

Lallo West PIP

Magapit PIS

Nassiping PIP

Sto. Niño PIP

Lower Chico RIS

Alcala Amulung West PIP

Solana PIS Rel. & Ext. Project

Santa Maria Communal PISPinacanauan RIS

Enrile PIP

San Pablo-Cabagan IS

Tumauini Reservoir Project

Rizal IP

Upper Chico RIS Delfin Albano PIP

Santa Isabel PIP Lapogan PIP

Lulutan PIPIlagn PIP

Mallig RIS

Gamu PIP

Damao PIP

Tagaran PIP

Napaccu PIP

Upper Ilagan Western Barangay PIP

Reina MercedesPIP

East Tabacal PIP San Mariano PIP

San Agustin PIP

Bantug PISVillaverde IP

Dibuluan RIP

Dabubu IPDebibi Groundwater IP

Nueva Vizcaya Bagabag IS

Mamil PIP

Iguig Alcala-Amulung PIS

Zinundungan Irrigation Extension Project

Figure 9.5.1

Resettlement Area

Layout Plan of Typical

5m

12.5m

8m

5m

40m 6m 40m 40m 40m6m 6m 40m25m

25m

625m

25m

217m

227m

LEGEND

Water Supply PIpe

Electric Line

HOUSE LAYOUT

GENERAL LAYOUT

Water Supply Tank

Water

Electric Supply

etc

Barangay HallHr

ChurchhC

0

Scale 1:1,500

20 40 60 m

School