annex v-contents 0320 - jica

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

Final Report Supporting Report

Annex VI: Flood Control

Figures

Aparri

Lal-lo

Magapit

Tuao

Iguig

Solana

Enrile

Cabagan

Tumauini

Cauyan

Ilagan

Magat Dam

Mallig

Tuguegarao

EchagueSantiago

Jones

Nassiping

Bayombon

Alcala

Amulung

Magapit Br.

Buntun Br.

Tupang

Babuyan Channel

Pared River

Chico River

Tuguegarao River

Pinacanauan River

Tumauini River

Magat RiverIlagan River

Siffu River

Mall

ig R

iver

Addalam River

Mag

at R

iver

Cag

ayan

Riv

er

Cagayan River

Caraballo Mountains

Sierra Madre Mountains

Cordillera Mountains

Dummon River

0 10 20 30 40 50 kmScale

General Basin Map

N

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

in the Republic of the Philippines

JAPAN INTERNATIONAL COOPERATION AGENCY

Figure 1.1.1

Dam

Diversion weir

River course

RoadBasin boundary

Sub-basin boundary

Legend

Sta Cruz River

VI-F1



Figure 1.1.2

JAPAN INTERNATIONAL COOPERATION AGENCYSchematic River System of the Cagayan River

Babuyan Channel

Aparri

Alcala

Zinundungan River

Chico River Dummon River

Pared River

Tuguegarao River

Pinacanauan River

Tumauini RiverMallig River

Siffu River

Ilagan River

Ganano River

Addalam River

Cagayan River

Faire

Roxas

San Mateo Naguilian

Cauayan

Mallig

Santiago City

San Agustin

Total Catchment Area : 27,300 sq.kmRiver Length : 520 km

Note

Legend: City/municipality

: Rivers

Magapit

Nassiping

Tuguegarao City

Cabagan

Ilagan

Jones

Magat RiverSanta Cruz River

Source : Topographic Maps

VI-F2

Caba

gan

Tum

auin

i

Tugu

egar

aoBu

ntun

Br.

Par

ed R

.(R

)

Chi

co R

.(L)

Dum

mon

R.(

R)

Zin

undu

ngan

R.(

L)

Igui

g

Amul

ung

Alca

laN

assi

ping

Gat

tara

nM

agap

it Br

.La

l-lo

Apar

ri

Cag

ayan

R.

Mag

at R

.(L)

Ilaga

nT

ugue

gara

o R

.(R

)P

inac

anau

an R

.(R

)

Tum

auin

i R.(

R)

Sif

fu R

.(L)

Ilag

an R

.(R)

Gam

u Br

.N

agui

lian

Br.

Caua

yan

Gan

ano

R.(

L)

Add

alam

R.(

L)

Dal

ibub

on B

r.

Jone

s

1/10 1/100 1/200

1/500

1/10001/2000

0

500

1,000

1,500

2,000

0 100 200 300 400 500 600

Distance from River Mouth (km)

Elev

atio

n (E

L m

)Source:Topographic Map

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River Width of the Cagayan River

0

1000

2000

3000

4000

5000

0 20 40 60 80 100 120 140 160 180


Wid

th (m

)

Low Water Channel

River width including flood plain

Apa

rri

Mag

apit

Br.

Zinu

ndun

gan

R.(L

)

Dum

mon

R.(R

)

Chic

o R.

(L)

Nas

sipin

g

Pared

R.(R

)A

lcala

Bun

tun

Br.

Tugu

egar

ao R

.(R)

Sta.

Mari

a Br

.Pi

naca

naua

n R

.(R)

Cab

agan

-30

-20

-10

0

10

20

30

40

50

0 20 40 60 80 100 120 140 160 180

Ele

vati

on (E

l m

L e ft Bank

Right Bank

Deepest River BedMean River Bed

Riverbed Slope=1/21,000 Riverbed Slope=1/9,000Riverbed Slope=1/10,000 Riverbed Slope=1/7,000

Longitudinal Profile of the Cagayan River

Mean River Bed slope

VI-F5

Bankful Carrying Capacity

0

5000

10000

15000

20000

25000

0 20 40 60 80 100 120 140 160 180


Car

ryin

g C

apac

ity (m

3 /s)

Apa

rri

Mag

apit

Br

Zin

undu

ngan

R.(

L

Dum

mon

R.(

R

Chi

co R

.(L

Nas

sipi

ng

Par

ed R

.(R

Alc

ala

Bun

tun

Br

Tug

uega

rao

R.(

R

Sta.

Mar

ia B

rP

inac

anau

an R

.(R

Cab

agan

-20

-10

0

10

20

30

40

50

Dep

th (m

)

Average River Bed

Deepest River Bed

Channel Depth below Riverbank Elevation

VI-F6

Bankful Carrying Capacity0

2000

4000

6000

8000

10000

12000

0 2 4 6 8 10 12 14


Wid

th (m

)


in the Republic of the PhilippinesFigure 1.1.6

JAPAN INTERNATIONAL COOPERATION AGENCYCharacteristics of Existinng River Channel

( Chico River)

VI-F7

Longitudinal Profile of the Chico River

-20

-10

0

10

20

30

40

Elev

atio

n (E

l m)

Left BankRight Bank

Deepest River Bed Average River Bed

Riverbed Slope=1/2,800

Channel Depth below Riverbank Elevation0

2

4

6

8

10

12

14

16

18

20

Average River Bed

Deepest River Bed

River Width of the ChicoRiver

0

200

400

600

800

1000

Law Water Channel

Bankful Carrying Capacity

0

2000

4000

6000

8000

10000

12000

14000

16000

0 2 4 6 8 10 12 14


Wid

th (m

)


in the Republic of the PhilippinesFigure 1.1.7

JAPAN INTERNATIONAL COOPERATION AGENCYCharacteristics of Existinng River Channel

(Tuguegarao River)

Longitudinal Profile of the Tuguegarao River

-10

0

10

20

30

40

50

60

70

80

Elev

atio

n (E

l m)

Left Bank

Right Bank

Deepest River Bed Average River Bed

Riverbed Slope=1/800

River Width of the Tuguegarao River

0

200

400

600

800

1000

1200

Law WaterChannel

Channel Depth below Riverbank Elevation

Average River Bed

Deepest River Bed

0

2

4

6

8

10

12

14

16

VI-F8

Geomorphological Survey Mapof the Cagayan River (1/3)




Figure 1.1.8

N

VI-F9





Figure 1.1.8

N

VI-F10





Figure 1.1.8

N

VI-F11

The Feasibility Study of the F

lood Control P

rojectfor the L

ower C

agayan River

in the Republic of the P

hilippines

JAPA

N IN

TE

RN

AT

ION

AL

CO

OPE

RA

TIO

N A

GE

NC

Y

Figure 1.1.9

Typical cross-section of alluvial plain

FormerRiver Course Valley PlainExisting River

Mountain, Hill, Terrace Alluvial Plain

HigherAlluvial Plain

HigherAlluvial Plain

LowerAlluvial plain

LowerAlluvial Plain

LowerAlluvial Plain

Alluvial PlainWater Surface

Cliff Natural Levee Natural LeveePointBar

Back Swamp

Aparri

Lal-lo

Magapit

Babuyan Channel

0 1 2 3 4 5 kmScale

N

River Course Shifting (1/5)


in the Republic of the PhilippinesJAPAN INTERNATIONAL COOPERATION AGENCY

Figure 1.1.10

Legend

Topographic map (1947 - 1953)

Aerial photographs (1979)



Road

A

C

DD

C

B

B

A

VI-F13

Gattaran

Nassiping

Alcala

Amulung

0 1 2 3 4 5 kmScale

N




Figure 1.1.10

Legend





Road

E

E

VI-F14

Solana

Tuguegarao

Iguig

Enrile

Namabbalan

0 1 2 3 4 5 kmScale


N



Figure 1.1.10

Legend





Road

F

FG

H

H

G

VI-F15

Cabagan

Tumauini

0 1 2 3 4 5 kmScale

N




Figure 1.1.10

Legend





Road

D

D

VI-F16

0 1 2 3 4 5 kmScale

N




Figure 1.1.10

Legend





Road

Legend





Road

Ilagan

VI-F17

Variation of River Bed Elevation (Mean/Deepest)-30

-20

-10

0

10

20

30

40

Mean River Bed ('00)

Mean River Bed ('86)

Deepest River Bed ('86)

Deepest River Bed ('00)

-10

-5

0

5

10

15

20

0 20 40 60 80 100 120 140 160 180Distance from River Mouth

(km)

-2.4m ('00)

-2.6m ('86)

-1.7m ('00)

-2.1m ('86)

6.8m ('00)

6.6m ('86)

13.0m ('86)

13.0m ('00)

Variation of Average River Bed Elevation (Mean) for the Past 14 years

VI-F18



Figure 1.1.12

Cross-Sectional Variation (4/4)

VI-F22

Babuyan Channel

Aparri

Linao

Tallungan

Zanja

Bisagu

Paruddun Sur

Mbangug

Macanaya



Figure 1.1.13

Variation of Sandbar near River Mouth

Scale0 0.5 1 2 km

Legend

Topographic Map (1979)



VI-F23



Figure 1.1.14


Flow direction

River bank consists of coarsesand with small stones

Track of natural levee/sand dune

Erosion

SedimentationSedimentation

Erosion

Erosion and Sedimentation Process due to River Meandering

2�`3H 2�`3H

H

Process of Erosion and Sedimentation at Bending Sections

Source: Yamamoto,1989: Chuuseki Kasenngaku, pp 183 and 184

Erosion and Sedimentation due to RiverMeandering

Erosion

Sedimentation

VI-F24

Nassiping

Alcala

Amulung

Solana

Tuguegarao

Iguig

Enrile

Meandering rate (S) Year AB CD S (km) (km) (AB/CD)1953 87.0 41.0 2.121979 78.0 41.0 1.901996 74.8 41.0 1.822000 74.4 41.0 1.81

Stra

ight

line

leng

th =

41.

0 km

Meandering rate

Meandering rate (S) = AB / CD

AB : Channel length CD : Straight line length

CA

Channel

DB

0 10 20 30 40 50 60

0 10 20 30 40 50 60

0.0

0.2

0.4

0.6

0.8

0.0

0.2

0.4

0.6

0.8

1950 1960 1970 1980 1990 2000 2010

Meandering rate (S)

( S=

AB

/CD

)

2.4

2.2

2.0

1.8

1.6

Meandering rate

Legend





Road



Figure 1.1.15Meandering Rate in the Reach from Alcala to Tuguegarao

N

0 2 4 6 8 10 kmScale

VI-F25



Figure 1.1.16

JAPAN INTERNATIONAL COOPERATION AGENCYRiver Meandering Characteristics (1)

VI-F26

(A) : Development Process of River Meander

: Pool (Deep) : Erosion

Data�@Source : Yamamoto, 1994 : The Kado Tokuseironn, Japan, Public Works Research Institute Paper Vol.2662, pp.80-109 and Kondrat'yev, N.Y

(B) : Relationship between Meandering Rate (S) and (B/Hmax) for Various Rivers

Data Source: Yamamoto, 1989 : Study note on influence on river channel characteristics by climatis, topography and soilconditions,Japan, Pulic Works Research Institute Paper Vol.2795, pp.88-124 and Schumm, S.A., 1960 : The shape of alluvialchannels in relation to sediment type,U.S. Geological Survey Professional Paper 352-B

0.0

0.5

1.0

1.5

2.0

2.5

3.0

1 10 100

B/Hmax

I= -1/1800I=1/ 800-1/1200I=1/1200-1/1600I=1/1600-1/2500I=1/2500-1/5000I=1/5000- 0

B: River width (m)Hmax.: Max. water depth (m)

Cagayan River



Figure 1.1.17


(B): Relationship between Meandering Rate (S) and (B/R) for Various Rivers in India and Pakistan

River Meandering Characteristics (2)

Data Source: Yamamoto, 1989 : Study note on influence on river channel characteristics by climatis, topography and soil conditions,Japan, Pulic Works Research Institute Paper Vol.2795, pp.88-124

0.8

1.0

1.2

1.4

1.6

1.8

2.0

2.2

2.4

10 100 1000 10000B/R

d50(cm)0.004 - 0.010.01 - 0.020.021 - 0.050.051 - 0.10.11 - 0.48

d50=0.01-0.02

d50=0.02-0.05

Gravel

B: River width (m)R: Hydraulic mean depth (m)

Cagayan River

(A): Relationship between Meandering Rate (S) and (B/R) for Various Rivers in Indonesia

Data Source: Yamamoto, 1989 : Study note on influence on river channel characteristics by climatis, topography and soil conditions,Japan,Pulic Works Research Institute Paper Vol.2795, pp.88-124

B/R

0.0

0.5

1.0

1.5

2.0

2.5

1 10 100 1000

Ib=1/ 800-1/1200

Ib=1/1200-1/1600

Ib=1/1600-1/2500

Ib=1/2500-1/5000

Ib=1/9000

Ib=1/3000

Ib=1/2000

Ib=1/1000

CagayanRiver(Ib=1/9000)

B: River width (m)R: Hydraulic mean depth (m)

170

Present condition

after construction of cut-off channel

VI-F27

River Course in 1713 River Course in 1762

Present River Courseconfined by Dike

Present River Courseconfined by Dike

Old River Coursein 1713

Old River Coursein 1762

Japan Sea Japan Sea

Agano River Agano River

Floodway witha length of 4 km

Floodway witha length of 4 km

Diversion Channel Diversion Channel

NiigataCity

NiigataCity

0 3 km0 3 km

(Completed in 1730) (Completed in 1730)

NN

Data Source: Oya and Kato, 1984 : Agano River Geomorphologic Map

VI-F28

.

164416491660~16721672~1822?1823?1823?191319341953

River courses reproducedbased on old maps and

topographic maps

LegendHistorical River Course Shiftingin the Mogami RiverSakata CityMogami River

Japan Sea

Present River Course

Present River Course

River courses scattered in the past were finally confined to the presentone by continuous earth dike throughout historical river improvementworks

Sourse: Ohya, Kotouda, Wakamathu and Kubo,1982: River course shifting of the Mogami

MogamiRiver

0 1 2 3 km

VI-F29

annex v-contents 0320 - jica

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