CAMEROUN MINISTERE DE L’AGRICULTURE ET DU DEVELOPPEMENT RURAL

CAMEROUN

ETUDE PREPARATOIRE POUR LE PROJET D’AMENAGEMENT DES INFRASTRUCTURES AGRICOLES

AU CAMEROUN

RAPPORT FINAL

Annexe

FEVRIER 2017

AGENCE JAPONAISE DE COOPERATION INTERNATIONALE

NTC INTERNATIONAL CO., LTD. EARTH AND HUMAN CORPORATION CO., LTD.

17- 005

6R

CR(3)

CAMEROUN MINISTERE DE L’AGRICULTURE ET DU DEVELOPPEMENT RURAL

CAMEROUN

ETUDE PREPARATOIRE POUR LE PROJET D’AMENAGEMENT DES INFRASTRUCTURES AGRICOLES

AU CAMEROUN

RAPPORT FINAL

Annexe

FEVRIER 2017

AGENCE JAPONAISE DE COOPERATION INTERNATIONALE

NTC INTERNATIONAL CO., LTD. EARTH AND HUMAN CORPORATION CO., LTD.

A-1

1. List of the persons to be interviewd

A-2

2. Minutes of Meeting (Inception Report)

A-3

A-4

A-5

3. Minutes of Meeting (Interim Report)

A-6

A-7

A-8

A-9

A-10

A-11

4. Minutes of Meeting (Japan Visit)

A-12

A-13

A-14

5. Minutes of Meeting (Draft Final Report)

A-15

A-16

A-17

A-18

A-19

6. Annex of Irrigation Component

Result of Soil Profile Survey (1) Upper Site of Upper Bumenda

Date of Soil Survey 14th/Mar/2016Surveyor Takashi KOTEGAWA

Location 5°58'38.30"N 10°24'37.99"EAltitude 1,179 mSoil ClassificationRemarks The soil pit is located in the rice seed producing farmland managed by the UNVDA. Since the farmland

belongs to UNVDA, the cultivation activities are rarely conducted in dry season. The farmland was reclaimed

approximately 40 years ago. The clear horizons are observed between each layer. The soil texture is assumed to be high in clay contents in the soil. Moreover,

the viscosity, plasticity and compactness are also high indicating that the amount of vertical drainage of the

water would be low, while the soil could retail the soil nutrients for the favourable growth of rice. The mottles of iron are observed from the upper layer to lower layer

though its abundance is different depending on the layers.

Horizon Range(cm) Profile

Ap 0-14/16

Horizon Smooth, Abrupt Color (Wet) 5YR 3/4 Mottles Irregular, FewSoil Texture Light Clay Gravel Fine gravel, Sub-angular, Few Structure

Week, Fine, Sub-angular blocky Viscosity Sticky Plasticity Plastic CompactnessMedium (20-24mm) Hardness Slightly Hard Plant roots Fine, Common

Ad 14/16-30

Horizon Smooth, Clear Color (Wet) 5YR 3/4 Mottles Irregular, FewSoil Texture Clay Loam Gravel Fine gravel, Sub-angular, Few Structure

Week, Fine, Sub-angular blocky Viscosity Sticky Plasticity Plastic CompactnessCompact (25-28mm) Hardness Hard Plant roots Fine, Very few

B 30-45/50

Horizon Smooth, Clear Color (Wet) 5YR2/3 Mottles Irregular, CommonSoil Texture Clay Loam Gravel Fine gravel, Sub-angular, Few Structure

Massive Viscosity Sticky Plasticity Plastic Compactness Very compact (>29) Hardness Hard Plant roots Fine, Very few

C1 45/50-68

Horizon Smooth, Clear Color (Wet) 5YR3/3 Mottles Irregular, CommonSoil Texture Light Clay Gravel None Structure Massive Viscosity

Sticky Plasticity Plastic Compactness Very compact (>29) HardnessHard Plant roots None

C2 68-85+

Color (Wet) 5YR4/4 Mottles Irregular, Common Soil Texture Clay LoamGravel None Structure Massive Viscosity Sticky Plasticity

Plastic Compactness Very compact (>29) Hardness Very Hard Plant rootsNone

A-20

Result of Soil Profile Survey (2) Middle Site of Upper Bumenda

Date of Soil Survey 14th/Mar/2016

Surveyor Takashi KOTEGAWALocation 5°58'17.39"N 10°25'2.84"E

Altitude 1,170 mSoil Classification

Remarks The soil pit is located in the farmland managed by the local farmer. The farmland is cultivated for maize, beans etc. in dry season while paddy cultivation is

conducted in rainy season. The farmland was reclaimed

approximately 40 years ago. The soil clay contents are assumed to be high in the soil of each layer. The mottles

of iron in the lower soil layer are more abundant than that of Upper site. Moreover, the accumulation of iron is

observed in the B horizon indicating that the permeabilityof surface layer could be low and the reduced condition of

the soil in the lower layer might be affected by the ground

water.

Horizon Range(cm) Profile

Ap 0-15/18

Horizon Wavy, Claer Color (Wet) 5YR 3/1 Mottles Irregular, Few Soil Texture Clay Loam Gravel Fine gravel, Sub-angular, Few Structure Week, Fine, Sub-angular blocky Viscosity Sticky Plasticity Very Plastic CompactnessMedium (20-24mm) Hardness Slightly Hard Plant roots Fine, Common

Bdgir 15/18-20/22

Horizon Wavy, Clear Color (Wet) 5YR 4/4 Mottles Irregular, CommonSoil Texture Light Clay Gravel Fine gravel, Sub-angular, Few Structure

Massive Viscosity Sticky Plasticity Very Plastic Compactness Compact (25-28mm) Hardness Slightly Hard Plant roots Fine, Very few

Cg1 20/22-50

Horizon Smooth, Clear Color (Wet) 5YR 5/1 Mottles Irregular, AbundantSoil Texture Clay Loam Gravel None Structure Massive Viscosity

Sticky Plasticity Plastic Compactness Very compact (>29) HardnessVery Hard Plant roots Fine, Very few

Cg2 50-80+

Color (Wet) 5YR 6/1 Mottles Irregular, Abundant Soil Texture Light ClayGravel None Structure Massive Viscosity Sticky Plasticity

Very Plastic Compactness Compact (25-28mm) Hardness Very Hard Plant roots None

A-21

Result of Soil Profile Survey (3) Lower Site (1) of Upper Bumenda

Date of Soil Survey 14th/Mar/2016Surveyor Takashi KOTEGAWA

Location 5°58'22.02"N 10°25'51.79"EAltitude 1,161 m

Soil ClassificationRemarks The soil pit is located in the farmland managed by the local farmer. The farmland is cultivated for maize,

beans etc. in dry season while paddy cultivation is

conducted in rainy season. The farmland was reclaimedapproximately 40 years ago. The soil clay contents are

assumed to be high in the soil of each layer. The ground water are observed in this soil pit. The height of ground

water is around 60 cm from the surface. The mottles of iron are found in the lower layer, but most of soil colors in

this pit are greyish, indicating the strongly reduced

condition of the soil.

Horizon Range(cm) Profile

Ap 0-15/22

Horizon Irregular, Clear Color (Wet) 5YR 3/1 Mottles None Soil TextureLight Clay Gravel Fine gravel, Sub-angular, Few Structure Week, Fine, Sub-angular blocky Viscosity Sticky Plasticity Very Plastic Compactness Compact (25-28mm) Hardness Slightly Hard Plant roots Fine, Common

BC 15/22-42/45

Horizon Wavy, Diffuse Color (Wet) 5YR 3/2 Mottles Irregular, FewSoil Texture Heavy Clay Gravel Fine gravel, Sub-angular, Few Structure

Massive Viscosity Sticky Plasticity Very Plastic Compactness Compact (25-28mm) Hardness Slightly Hard Plant roots None

Cg1 42/45-68/70

Horizon Wavy, Diffuse Color (Wet) 5YR 6/1 Mottles Irregular, CommonSoil Texture Light Clay Gravel None Structure Massive Viscosity

Sticky Plasticity Very Plastic Compactness Compact (25-28mm) HardnessHard Plant roots None

Cgir2 68/70-85+

Color (Wet) 7.5YR 6/6 Mottles Irregular, Common Soil Texture Heavy Clay Gravel None Structure Massive Viscosity Sticky PlasticityVery Plastic Compactness Compact (25-28mm) Hardness Hard Plant rootsNone

A-22

Result of Soil Profile Survey (4) Lower Site of Upper Bumenda 2

Date of Soil Survey 15th/Mar/2016Surveyor Takashi KOTEGAWA

Location 5°58'10.84"N 10°26'50.50"EAltitude 1,161 m

Soil ClassificationRemarks The soil pit is located in the farmland managed by the local farmer. The farmland is cultivated for maize,

beans etc. in dry season while paddy cultivation is

conducted in rainy season. The farmland was reclaimedapproximately 7 years ago, which is different from the

other soil pits. The agricultural machines such as tractor are not utilized in this area since the suitable internal road

for the machines are not well constructed. The ground water are observed in this soil pit. The height of ground

water is around 90 cm from the surface. The mottles of

the iron are observed in B horizon, indicating the low water permeability.

Horizon Range(cm) Profile

Ap 0-10/15

Horizon Wavy, Diffuse Color (Wet) 5YR 3/1 Mottles Root-like, FewSoil Texture Clay Loam Gravel Fine gravel, Sub-angular, Few Structure

Week, Fine, Sub-angular blocky Viscosity Sticky Plasticity Plastic CompactnessMedium (20-24mm) Hardness Slightly Hard Plant roots Fine, Common

AB 10-15/20-25

Horizon Irregular, Diffuse Color (Wet) 5YR 3/1 Mottles Root-like, Few Soil Texture Light Clay Gravel Fine gravel, Sub-angular, Few Structure

Week, Fine, Sub-angular blocky Viscosity Sticky Plasticity PlasticCompactness Compact (25-28mm) Hardness Hard Plant roots Fine

Few

Bg 20-25/45-53

Horizon Wavy, Clear Color (Wet) 7.5YR 5/1 Mottles Root-like & Irregular, Common Soil Texture Heavy Clay Gravel None Structure Massive

Viscosity Sticky Plasticity Very Plastic Compactness Compact (25-28mm)Hardness Hard Plant roots Fine, Very few

C1 45-53/70

Horizon Smooth, Clear Color (Wet) 5YR 5/1 Mottles Irregular, CommonSoil Texture Heavy Clay Gravel None Structure Massive Viscosity

Sticky Plasticity Very Plastic Compactness Compact (25-28mm) HardnessHard Plant roots None

C2 70-85+

Color (Wet) 7.5YR 4/1 Mottles Irregular, Few Soil Texture Heavy ClayGravel None Structure Massive Viscosity Sticky Plasticity Very

Plastic Compactness Compact (25-28mm) Hardness Hard Plant rootsNone

A-23

A-24

A-25

A-26

A-27

A-28

7. List of Drawings (Irrigation Component)

Title Nos PageGeneral Plan 1 A-30Drainage Canal and Farm Road 1 A-31Main Drainage Plan and Profile 9 A-32, 33, 34, 35, 36, 37, 38,

39,40Tractor Passage 1 A-41Farm Road Crossing 2 A-42, 43Irrigation Canal 1 A-44Bridge 2 A-45, 46, 47, 48

A-29

A-30

5000

100

200

300

5720

1:1.2

b500 500

BH H

5001:1.0

b 500500

B HH

500

1:1.0

5000

7880

1:1.2

300

CL

b 500500

BH

H

1:1.0

100

1200 b500 500

500

H

BH H

B:b:H:

Drainage Type A

0.41.60.6

Drainage Type B

0.52.10.8

Drainage Type C

0.62.61.0

Drainage Type D

0.83.21.2

Drainage Type E

1.24.61.7

Drainage Type G Drainage Type H

4.08.22.1

Drainage Type I

4.89.02.1

Drainage Type J

5.29.42.1

8.012.42.2

Drainage Type F

1.65.62.0

Drainage Canal and Farm Road

Farm Road TypeA

Farm Road TypeB

Drainage CanalDrainage Canal

Drainage Canal

1:1.0

Drainage CanalCL

CL

CL

CL

CL

Cross Section

Cross Section

S=1:50

S=1:50

B'

H'

B

50

500

960

H

1:1.0

150

500

CL

Farm Field LevelFarm Field Level

300

360 360

A-31

A-32

A-33

A-34

A-35

A-36

A-37

A-38

A-39

A-40

5000

1200

H

HBH5001440

b

1:1.21:1.2

1:1.0

1:1.0

Road

Masonry WorkMasonry Work

250

3000

250

5000 1440 500 H B H

Tractor Passage TypeA~E

5000

300

600

500360

1:1.2 1:1.2

1:1.0 1:1.0

600400600

1600

200

3000

200

Road

Masonry WorkMasonry Work

Ø30

0

5000240

500 H B H240

CL CL

CLCL

Tractor Passage

Tractor Passage TypeF

Cross SectionCross Section

PlanPlanS=1:100 S=1:100

ΦD

Type AB: b: H:

0.4 1.6 0.6

B: b: H: B: b: H: B: b: H:

0.5 2.1 0.8 0.6 2.6 1.0 0.8 3.2 1.2

Tractor Passage TypeAD=Φ800

Drainage

Tractor Passage TypeBD=Φ1000

Tractor Passage TypeCD=Φ1000x2

Type BDrainage

Type CDrainage

Type DDrainage

Drainage Canal

Drainage Canal

NOTE: Construction of Tractor Passage Type A~E@120m along Farm Road in Middle anddownstream area.

NOTE: Construction of Tractor Passage Type F @20m along Farm Road in upstream area.

B: b: H:

1.2 4.6 1.7

Type EDrainage

Tractor Passage TypeDBox w1.5xh1.0

Tractor Passage TypeEBox w2.0xh1.0

A-41

5000

7880

1:1.2

500

8880

Farm Road CrossingRoad Crossing TypeA~GPlan

S=1:100

Cross Section

Road

CL

CL

H

1:1.0

L

A

A

Cross Section A-A

500

200200

H20

080

0

600

200

1200

200

200

C

5000

7880500 500200200

8880

W200

W200200

Road

Drainage Canal

8480

Type A Type B Type C Type D

W1.0xH1.5 W2.0xH1.0 W2.0xH1.5 W2.0xH2.0

Type E Type F Type G

W2.0xH2.0 W2.5xH2.5 W2.5xH2.5

CrossingFarm Road

CrossingFarm Road

CrossingFarm Road

CrossingFarm Road

CrossingFarm Road

CrossingFarm Road

CrossingFarm Road

(Double) (Double) (Triple)

A-42

5000

7880

1:1.2

500

8880

Farm Road CrossingRoad Crossing TypeH~I

Plan

S=1:100

Cross Section

Road

CL

CL

A

A

500

200200

100

300

7880500 500200200

8880

Cross Section A-A

1200

500

500

200

200

100

200

D

D

200

300

200

100

500

D

CL

D20

020

0

200 200100 100

D

D10

010

020

020

0

30°

Road

Drainage Canal

Drainage Canal

8480

Type HCrossing

Type I

D800 D1000100

100

Farm RoadCrossing

Farm Road

A-43

1000

200

1400

400

500

500130 130

130 130

130

130

810

0

CL

1400

200

200200

580

500

70052

0

500

50150100

92

CL

200 1000 200130 130

15090 90

630

70

40

Division Box

200

1400

200

200

A A

Cross Section A-A

S=1:30

Steel gate

t=6mm

200 1000 200

200 200

Irrigation Canal

Plan

W580xH520

CL

130

8

200

50

150

50

654065

2011

013

0

420

Φ13 CL

200

280

InletNOTE: Construction of

inlet @10m alongIrrigation canal.

Steel gateW260xH420

40

260

t=6mm

S=1:30

Cross Section

Plan

B'

H'

B

50

500

960

H

1:1.0

B:B':H:H':b:

Irrigation Type A

0.40.660.40.530.86

Irrigation Type B

0.50.760.50.630.96

150

500

Irrigation Canal

CL

S=1:30

Cross Section

A-44

4.05

18.00

Wing wall

Approach slab

Abutment

Gargoyle Ø 100 mm)

Spread footer

Embankment

Spread footer

4.00

EL=1156.2m

1.55

0.20 0.20

1.00

0.10

EL=1159.4m

EL=1158.9m 6.50

1.00

0.10

5.00

1.25

6.25

1.10

3.00

3.30

EL=1160.95m

0.80

0.70

EL=1160.95m

0.31

1.22

2.05

3.25

3.20

0.80

0.50

3.25

0.90

1.90

0.25

1.00

4.80

SECTION PLAN6.

25

CROSS SECTION

Gargoyle Ø100mm

2.5%

Gargoyle Ø100mm

2.5%

5.006.00

2.00 2.002.00

0.55

0.35

0.20 0.

20

0.200.300.500.50

0.50

0.10

0.50

0.30

0.30

0.40

0.80

FORM PLAN ABUTMENT

2.5%

Approach slab

Scabbard PVC

Divice support elastomerhooped (20x30)

2.5%

0.30 0.30Scabbard PVC

0.30 5.40 0.301.70 2.00 1.70

6.00

0.20

1.05

0.20

0.35 0.

551.

051.

000.

100.20 6.00 0.206.40

4.00 6.

601.

60

0.20

0.20

0.20 4.00 0.204.40

1.00

0.10

3.544.

001.

25

0.92

0.30

0.50

5.25

6.25

5.25

0.70 0.30

0.30

1.301.00

1.20 0.80 2.00

0.50

ABUTMENT SECTION

A-45

2.5%

2.5%

Guardrail (galvanized steelØ60mm)Round steel tube Ø60mm

5 %

5 %

PLAN VIEW

2.00

0.18

10.0

06.

0010

.00

26.0

0

0.90 4.05 6.50 4.80 0.90

18.00

5.40

5.00

0.50

0.50

6.00

0.30

0.30

A-46

4.80

Wing wall

Approach slab

Gargoyle Ø 100 mm)

Spread footer

Embankment

Spread footer

4.00

EL=1156.2m

1.65

0.20 0.20

EL=1154.1m

EL=1153.7m

6.85

1.00

0.10

4.00

1.25

5.25

1.10

3.00

3.30

EL=1155.75mEL=1155.75m

0.40

1.22

6.50

2.05

3.10

0.80

0.50

4.05 4.65

5.40

0.92

18.00

0.50

6.25

1.00

FORM PLAN ABUTMENT

2.5%

Approach slab

Scabbard PVC

Divice support elastomerhooped (20x30)

2.5%

0.30 0.30Scabbard PVC

0.30 5.40 0.301.70 2.00 1.70

6.00

0.20

1.05

0.20

0.35 0.

551.

051.

000.

100.20 6.00 0.206.40

4.00 6.

601.

60

0.20

0.20

0.20 4.00 0.204.40

1.00

0.10

3.544.

001.

25

0.92

0.30

0.50

5.25

6.25

5.25

0.70 0.30

0.30

1.301.00

1.20 0.80 2.00

0.50

ABUTMENT SECTION

CROSS SECTION

Gargoyle Ø100mm

2.5%

Gargoyle Ø100mm

2.5%

5.006.00

2.00 2.002.00

0.55

0.35

0.20 0.

20

0.200.300.500.50

0.50

0.10

0.50

0.30

0.30

0.40

0.80

A-47

2.5%

2.5%

Guardrail (galvanized steelØ60mm)Round steel tube Ø60mm

5 %

5 %

PLAN VIEW

2.00

0.18

10.0

06.

0010

.00

26.0

0

0.90 4.05 6.50 4.65 0.90

5.00

0.50

0.50

6.00

A-48