2.4 pisco river tabl e 2.10 peak ddischarge to each probab...

2.4

(1)

The pthe Phydro1/10, were

(2)

The rbelow

Pisco Riv

Hydrograp

peak discharPisco Riverographs are s 1/25, and made into th

Result of I

result of inunw.

Table 2.11

Pisco

Without Case

ver

ph for each

rge accordingr is shown shown in Fig

1/50 year phe object for

Figure

Inundation A

ndation analy

Inundation

No, of Me

The Pr V

Feasibil

Probable Fl

g to probablein Table

gure 2.7. Amrobable floothe inundati

2.7 Probab

Analysis (wi

ysis for each

n area for each

Mesh ha

251 564.

1/5

Preparatory StuVulnerable Rurality Study Rep

2-27

lood Scale

e flood scale2.10, and

mong these, 1od hydrograpion analysis.

ble Flood Hyd

ithout case)

h probable fl

h Probable F

No, of Mesh

8 344

1/1

udy on Project al Population ort, Supporting

e in the

1/5, phs

drographs (P

lood without

Flood Scale in

ha No

774.0

10

Table

of the Protecagainst Flood g Report, Anne

Pisco River)

case in the P

n Pisco River

, of Mesh ha

438 9

1/25

2.10 Peak D

Flood S

1

2

5

10

Return Period

ction of Flood d in the republ

ex-2 Inundatio

Pisco River

(Without cas

a No, of Mes

985.5 51

Discharge to

Scale (Pisco R

2 5 0 4

25 50 800

Q max

96

6

22

Plain and lic of Peru on Analysis

is shown

se)

sh ha

17 1,163.3

1/50

Each Probab

River)

51

56

x

63

88

8714

ble

The Preparatory Study on Project of the Protection of Flood Plain and Vulnerable Rural Population against Flood in the republic of Peru

Feasibility Study Report, Supporting Report, Annex-2 Inundation Analysis

2-28

Pisco River (1/50 Year Probable Flood) Without Case




2-29





2-30

(3) Flood Mitigation Measures

From the result of inundation analysis without case, the locations of flood mitigation measures such as riverbed excavation, revetments and dykes for flood were planned by taking into account the spreading areas of flood. The locations of measures are shown in Figure 2.8.

The Pr V

Feasibil


2-31




ex-2 Inundatio


Fig

ure

2.8

Lo

catio

ns fo

r Fl

ood

Miti

gatio

n M

easu

res i

n Pi

sco

Riv

er



2-32

(4) Result of Inundation Analysis for each Probable Flood (with case)

The result of inundation analysis for each probable flood scale with case is shown on Table 2.12.

Table 2.12 Inundation area for each Probable Flood Scale in Pisco River (With case)

No, of Mesh ha No, of Mesh ha No, of Mesh ha No, of Mesh ha

18 40.5 69 155.3 140 315.0 193 434.3Pisco

1/25 1/50With Case

1/5 1/10



2-33

Pisco River (1/50 Year Probable Flood) With Case




2-34


Pisco River (1/5 Year Probable Flood) after Measures

2.5

(1)

The pin thehydro1/5, hydroinund

(2)

The rin Ta

Yauca Ri

Hydrograp

peak dischare Yauca Rivographs are

1/10, 1/25ographs wedation analys

Result of I

result of inunble 2.14.

Table 2.14

Yauca

Without Case

iver

ph for each

rge accordingver is shownshown in F

5, and 1/50re made insis.

Figure

Inundation A

ndation analy

Inundation

No, of M

-

e

The Pr V

Feasibil

Probable Fl

g to probabln in Table 2

Figure 2.9. A0 year pronto the obj

2.9 Probab

Analysis (wi

ysis for each

area for each

Mesh ha

-

1/5


2-35

lood Scale

le flood scal2.13, and thAmong theseobable floodject for th

ble Flood Hyd

ithout case)

h probable flo

h Probable F

No, of Mesh

1

1/1


e e

e, d e

drographs (Ya

ood without

lood Scale in

ha No

2.3

10

Table 2


auca River)

case in the Y

Yauca River

, of Mesh ha

18

1/25

2.13 Peak D

Flood Sca


ex-2 Inundatio

Yauca River

r (Without ca

a No, of Mes

40.5 4

Discharge to E

ale (Yauca Ri


is shown

ase)

sh ha

40 90.0

1/50

Each Probabl

iver)

le



2-36

Yauca River (1/50 Year Probable Flood) Without Case




2-37


(3) Flood Mitigation Measures

From the result of inundation analysis without case, the locations of flood mitigation measures such as riverbed excavation, revetments and dykes for flood were planned by taking into account the spreading areas of flood. The locations of measures are shown in Figure 2.10.

FFigure 2.10 L

The Pr V

Feasibil

Locations for


2-38

r Flood Mitig


gation Measu


res in Yauca


ex-2 Inundatio

River




2-39


- - 1 2.3 13 29.3 20 45.0Yauca

1/5 1/10 1/25 1/50With Case

(4) Result of flood analysis according to each probable flood scale (with case)

The result of inundation analysis for each probable flood scale with case is shown in Table 2.15.

Table 2.15 Result of Flood Analysis with Case Works in Yauca River (With Case）



2-40

Yauca River（1/50 Year Probable Flood）With Case




2-41



2.6

(1)

The pscale Table

Figur

1/50 into t

(2)

The ris sho

Ta

Majes-C

HydrograpScale

peak dischain the Ma

e 2.16, and re 2.11. Amyear probab

the object for

Result of i

result of inunown in Table

able 2.17 Inu

Majes-Caman

Without Case

amana Rive

ph for eac

arge accordinajes-Camana

the hydrogmong these, ble flood hydr the inundat

Figure 2.11

nundation a

ndation analye 2.17.

undation Area

No, of M

na

e

The Pr V

Feasibil

er

ch Probabl

ng to probaba River is sgraphs are s

1/5, 1/10, 1drographs wtion analysis.

Probable F

analysis (wit

ysis for each

a for each Pro

Mesh ha

714 1,606.

1/5


2-42

le Flood

ble flood shown in shown in 1/25, and

were made .

Flood Hydrog

thout case)

h probable fl

robable Flood

No, of Mesh

5 1,001

1/1


graphs (Majes

lood without

d Scale in Maj

ha No

2,252.3

10

Table 2.16


-Camana Riv

case in the M

jes-Camana R

, of Mesh ha

1,157 2,6

1/25

2

5

10

25

50

100

QReturnPeriod

Peak Discha

Scale (Majes-


ex-2 Inundatio

ver)

Majes-Cama

River (Withou

a No, of Mes

603.3 1,63

270 728

1,167 1,921 2,659 3,586

Q max

arge to Each P

s-Camana Riv


ana River

ut case)

sh ha

32 3,672.0

1/50

Probable Floo

ver)

od



2-43

Maj

es-C

aman

a R

iver（

1/25

Yea

r Pr

obab

le F

lood

）W

ithou

t C

ase

Maj

es-C

aman

a R

iver（

1/50

Yea

r Pr

obab

le F

lood

）W

ithou

t Cas

e



2-44

Maj

es-C

aman

a R

iver（

1/5

Year

Pro

babl

e Fl

ood）

With

out C

ase

Maj

es-C

aman

a R

iver（

1/10

Yea

r Pr

obab

le F

lood

）W

ithou

t Cas

e

(3)

Fromsuch the sp

Flood Mit

m the result oas riverbed preading are

Figure 2.

igation Mea

of inundatioexcavation,

eas of flood.

.12 Locatio

The Pr V

Feasibil

asures

n analysis wrevetments aThe location

ons for Flood


2-45

without caseand dykes fons of measur

Mitigation M


, the locatioor flood werres are show

Measures in M


ons of flood re planned byn in Figure

Majes-Caman


ex-2 Inundatio

mitigation my taking into2.12.

na River (1/2)


measures o account

)

(4)

The rbelow

Ta

Figure 2.1

Result of I

result of inuw.

able 2.18 Inu

Majes-Caman

With Case

12 Location

Inundation

undation anal

undation are

No, of M

na

The Pr V

Feasibil

ns for Flood M

Analysis for

lysis for eac

ea for each Pr

Mesh ha

104 234.

1/5


2-46

Mitigation M

r each Prob

ch probable f

robable Floo

No, of Mesh

0 196

1/1


Measures in M

bable Flood

flood scale w

od Scale in M

ha No

441.0

10


Majes-Caman

(with case)

with case is

Majes-Caman

, of Mesh ha

288 6

1/25


ex-2 Inundatio

na River (2/2

shown in Ta

na River (with

a No, of Mes

648.0 52


2)

able 2.18

h case)

sh ha

23 1,176.8

1/50



2-47

M

ajes

-Cam

ana

Riv

er（

1/25

Yea

r Pr

obab

le F

lood

）W

ith C

ase

Maj

es-C

aman

a R

iver（

1/50

Yea

r Pr

obab

le F

lood

）W

ith C

ase



2-48

M

ajes

-Cam

ana

Riv

er（1/

5 Y

ear

Prob

able

Flo

od）

With

Cas

e M

ajes

-Cam

ana

Riv

er（

1/10

Yea

r Pr

obab

le F

lood

）W

ith C

ase



3-28

(7) Majes-Camana River（1/5 Year Probable Flood）Without Case

(8) Majes-Camana River（1/5 Year Probable Flood）With Case



3-1

CHAPTER 3 CONCLUSION

About the result of flood analysis for each river, the comparison without case and with case is shown below. As for the Chira River, since the fact that the discharge capacity is insufficient in all sections in the river, even if measures are carried out partially, the flood damage is not reduced. On the other hand, about other rivers, it turns out that the flood damage has reduced sharply after implementation of works. In addition, in the Yauca River, since flood areas are limited along the river, the effects of measures work are small.

Table 3.1 Comparison of Inundation Areas between Without Case and With Case


6,233 14,024.3 7,340 16,515.0 8,661 19,487.3 9,589 21,575.3

73 164.3 391 879.8 552 1,242.0 678 1,525.5

①Chico 270 607.5 293 659.3 714 1,606.5 827 1,860.8

②Matagente 249 560.3 265 596.3 498 1,120.5 587 1,320.8

③No. of Overlap Mesh 0 0.0 0 0.0 249 560.3 256 576.0

①+②-③ 519 1,167.8 558 1,255.5 963 2,166.8 1,158 2,605.5

251 564.8 344 774.0 438 985.5 517 1,163.3

- - 1 2.3 18 40.5 40 90.0

714 1,606.5 1,001 2,252.3 1,157 2,603.3 1,632 3,672.0


6,233 14,024.3 7,340 16,515.0 8,661 19,487.3 9,586 21,568.5

21 47.3 60 135.0 93 209.3 125 281.3

①Chico 24 54.0 56 126.0 248 558.0 397 893.3

②Matagente - - - - 148 333.0 245 551.3

③No. of Overlap Mesh - - - - 76 171.0 140 315.0

①+②-③ 24 54.0 56 126.0 320 720.0 502 1,129.5

18 40.5 69 155.3 140 315.0 193 434.3

- - 1 2.3 13 29.3 20 45.0

104 234.0 196 441.0 288 648.0 523 1,176.8

1/5 1/10 1/501/25

Majes-Camana

Pisco

Yauca

With Case

Canete

Chincha

Chira

1/5 1/10 1/25 1/50

Majes-Camana

Chincha

Chira

Canete

Yauca

Pisco

Without Case



3-2

3.1 Chira River

(1) Chira River (1/50 Year Probable Flood) Without Case

(2) Chira River (1/50 Year Probable Flood) With Case



3-3





3-4





3-5





3-6

3.2 Canete River

(1) Canete River (1/50 Year Probable Flood) Without Case

(2) Canete River (1/50 Year Probable Flood) With Case



3-7





3-8





3-9





3-10

3.3 Chincha (Chico) River

(1) Chincha (Chico) River (1/50 Year Probable Flood) Without Case

(2) Chincha (Chico) River (1/50 Year Probable Flood) With Case



3-11





3-12





3-13





3-14

3.4 Chincha (Matagente) River

(1) Chincha (Matagente) River (1/50 Year Probable Flood) Without Case

(2) Chincha (Matagente) River (1/50 Year Probable Flood) With Case



3-15





3-16





3-17





3-18

3.5 Pisco River

(1) Pisco River (1/50 Year Probable Flood) Without Case

(2) Pisco River (1/50 Year Probable Flood) With Case



3-19





3-20





3-21





3-22

3.6 Yauca River

(1) Yauca River (1/50 Year Probable Flood) Without Case

(2) Yauca River (1/50 Year Probable Flood) With Case



3-23





3-24





3-25

3.7 Majes-Camana River

(1) Majes-Camana River (1/50 Year Probable Flood) With Case




3-26





3-27





3-28



2.4 pisco river tabl e 2.10 peak ddischarge to each probab...

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