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Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
APPENDIX
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
List of Appendix
Appendix 2 Survey Result
Appendix 2-1 Results of Topographic Survey ...................................................................................... A-2-1
Appendix 2-2 Results of Geological ................................................................................................... A-2-10
Appendix 2-3 Results of Oceanographic Survey ................................................................................ A-2-57
Appendix 4
Appendix 4-1 Minutes of Meeting on the Commencement of Preparatory Survey
for the Mamelles Sea Water Desalination Plant Construction Project
in the Republic of Senegal.............................................................................................. A-4-1
Appendix 4-2 Presidential Decree of Exploitation of the Land for Mamelles Seawater
Desalination Plant Construction Project ......................................................................... A-4-6
Appendix 4-3 Hydaulic Calculation of Pipelines ................................................................................ A-4-13
Appendix 5
Appendix 5-1 Drawings ........................................................................................................................ A-5-1
Appendix 5-2 Connection to the existing inflow system ...................................................................... A-5-2
Appendix 6
Appendix 6-1 Environmental check list ................................................................................................ A-6-1
Appendix 6-2 Monitoring Form ............................................................................................................ A-6-2
Appendix 6-3 Letter from DEEC regarding Survey on Environmental and
Social Consideration necessary for CP-2, CP-3 and CP-4 ............................................. A-6-4
Appendix 8
Appendix 8-1 Estimated Construction Cost .......................................................................................... A-8-1
Appendix 8-2 Estimated Project Cost ................................................................................................... A-8-5
Appendix 8-3 Estimated Consulting Service Cost ................................................................................ A-8-6
Appendix 8-4 Estimated Dispute Board cost ........................................................................................ A-8-8
Appendix 9 Terms of the References of the Consulting Services ................................................................. A-9-1
Appendix 10
Appendix 10-1 Calculation of FIRR (at Present Tariff Rate)................................................................ A-10-1
Appendix 10-2 Calculation of FIRR at Affordability to Pay Level ...................................................... A-10-2
Appendix 10-3 Calculation of EIRR (at the Willingnedss to Pay (=the present tariff level)) ............... A-10-3
Appendix 10-4 Calculation of EIRR under (i) Initital Investment Cost +20% ..................................... A-10-4
Appendix 10-5 Calculation of EIRR under (ii) Production Amount
of Mamelles Plant -10,000m3/day ............................................................................... A-10-5
Appendix 10-6 Calculation of EIRR under (iii) Reduction of Production Cost
at Mamelles Plant -20% ............................................................................................... A-10-6
Appendix 10-7 Calculation of EIRR under (iv) Increase of Production Cost
at Mamelles Plant +20% .............................................................................................. A-10-7
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
Appendix 10-8 Calculation of EIRR under (v) Lower Outcome of
Water Recovery Portion (NRW rate +5%) ................................................................... A-10-8
Appendix 10-9 Calculation of EIRR under (vi) Increase of Willingness to Pay +57% ........................ A-10-9
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
Appendix 2 Survey result
Appendix 2-1 Results of Topographic survey
Location of Survey area
Control point applied
Location of Bench mark
Bench mark information
(With regard to outputs, please refer to Drawings)
A-2-1
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
Appendix 2
Appendix 2-2 Results of Geological survey
Borehole location map
Summary of Laboratory and Triaxial test resulats
Exploratory borehole log
Standard penetration test result
Laboratory test result
Triaxial test result
A-2-10
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Borehole locations on the site are given on the map below:
Figure 2: Borehole location Map
A-2-11
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Synthesis of the laboratory tests
The results of the laboratory tests carried out on the soil samples are recapitulated on the table below:
Recapitulative table of laboratory tests :
The results of the laboratory tests carried out on soil samples show that the soils have a
variable granulometry.
The direct shearing tests give:
On the brown sandy clay with lateritic concretions (G20-4), we have on the average 27.42 kPa
of cohesion and 27.6° of internal friction angle ;
On the brown clay with scattered basalt altered (G20-2), we have on the average 28.23 kPa of
cohesion and 26.69° of internal friction angle;
On the sandy clay (G5-1), we have on the average 47.60 kPa of cohesion and 20.96° of
internal friction angle;
G20-4 G5-1
1m 1,00m 2.00m 1.0m 7.00m 10.40m
Moisture content W% 4,72 7,03 44,7 15,47 25,06 32,25
γh 1,613 1,295 1,852 2,078 1,751 2,288
γd 1,540 1,210 1,280 1,800 1,400 1,730
Spécific Weight γs 2,590 2,640 2,290 2,620 2,541 2,551
2mm 97,3 74,1 91,3 90,6 89,9 70,6
1mm 96,5 67,5 88,8 89,8 84,4 65,3
0.5mm 96,0 64,0 86,3 88,1 80,2 59,3
0.2mm 86,2 59,6 81,4 73,6 74,7 51,6
0.16mm 59,0 48,6 68,9 43,7 65,5 41,9
0.08mm 54,8 42,9 61,5 39,0 60,4 37,5
WL 79,82 78,71 69,83 28,38
WP 30,13 30,81 24,56 12,32
IP 49,69 47,90 45,26 16,06
Ic 1,51 1,50 0,56 0,80
Blue methylen Value VBs - - - - 2,2 0,99
Cohesion (kPa) C 27,42 28,23 47,60 48,4 25,7
Internal friction angle (°) φ 27,60 26,69 20,96 24,5 36,44
Preconsolidation pressure (KPa)
σ'p 150,0 160,0 180,0 120,0
Compressibility factor Cc 0,25 0,48 0,40 0,19
Grain size analyse
Atterberg Limites (%)
Number of borehole G20-2 G20-1'
Depth(m)
Apparente density (t/m3)
Recapitulative table of laboratory tests
Project CONSTRUCTION OF SEA WATER DESALINISATION
Site Mamelles, Dakar
A-2-12
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The oedometer tests give:
An average preconsolidation stress of 150 kPa and an average compressibility coefficient of
0.25 in the sandy clay with lateritic concretions ;
An average preconsolidation stress of 170 kPa and an average compressibility coefficient of
0.44 in the brown clay with scattered basalt altered;
An average preconsolidation stress of 120 kPa and an average compressibility coefficient of
0.19 in the sandy clay.
The triaxial tests on basalt samples are summarized in the table below.
Recapitulative table of Triaxial tests
Hole ID Depth from (m) Depth to (m) ρd (g/cm³) C (MPa) Φ(⁰)
G5 -1 1.50 2.50 2.19 2.5 37
G5 - 4 0 1 2.15 4 43
G20 - 2 13 14 2.6 14 50
G20 - 3 2 3 2.41 9 37
G20 - 4 12 13 1.95 1.5 27
The analysis of these results shows a importatnte variation of cohesion as well as the internal friction
angle on the basalt. A minimum of 1.5 MPa cohesion is noted with an internal friction angle of 27 ° and
a maximum cohesion of 14 MPa with an internal friction angle of 50 °. This variation could be due to the
state of alteration of materials and bullous structure of this basaltic lava.
Hydrogeological synthesis:
The study area is located at the edge of the western hill of Mamelles and marked by rainwater runoff
channel towards the sea. So, we can not exclude the presence of anarchic water circulations on
preferential flow channels. The hydrological regime can vary depending on the season and rainfall.
A-2-13
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APPENDIX 1:
Log of the exploratory borehole
A-2-14
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ANNEXE 2 :
Results of laboratory tests
A-2-27
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20 24 28 32
E1 DE QU TE B3 PL
79.5 81.33 79.12 81.32 71.6 68.73
66.28 68 66.6 69.3 67.74 65.2
50.1 51.4 50.8 53.9 55.02 53.4
13.22 13.33 12.52 12.02 3.86 3.53
16.18 16.6 15.8 15.4 12.72 11.8
81.71 80.301 79.24 78.052 30.3459 29.91525
WL = 79.825 WP = 30.131 IP = 49.69 Ic = 1.51 A =
3- Echelle de consistance (Ic)
4- Echelle d'activité (A)
5- Diagramme de plasticité 6- Classification triangulaire des sols fins
Nomenclature des sols selon SN 670'010a (1993) CH: Argile limoneuse, graveleuse et/ou sableuseCL-ML: Limon argileux avec sable et/ou gravierOL: Limon organique, graveleux et/ou sableux OH: Argile limoneuse organique, graveleuse et/ou sableuseCL: Limon argileux, graveleux et/ou sableux ML: Limon graveleux ou sableux MH: Limon graveleux et/ou sableux de haute plasticité
2- Limite de Plasticité
DATE ESSAISVISA ING.
1- Limite de Liquidité
PROFONDEUR (m)
Argiles avec des blocs de basaltes altérés
JICA MAMELLES
DESCRIPTION SOMMAIRE
07/04/2015
OPERATEURN° REGISTRE N° SONDAGE N° ECHANT.
CLIENT N° DOSSIER TITRE DU PROJET OU CHANTIER
G20-4 (SC1) 1.00m
Nombre de coupsN° de la Tare Poids Total HumidePoids Total SecPoids total tarePoids net de l'eauPoids matériau secTeneur en eau (%)
Limites et indices
0
10
20
30
40
50
60
0 10 20 30 40 50 60 70 80 90 100
Indi
ce d
e Pl
astic
ité (I
p)
Limite de Liquidité (Wl)
70
80
90
0 5 10 15 20 25 30 35
Tene
ur e
n ea
u (%
)
Nombre de coups
-0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6
0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25
très fermefermepâteux (se) dur (e)liquide mou (-olle)
argiles inactives argiles normales argiles actives
>2,0
>1,5
A-2-29
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Poids spécifique
WL WP IP Ic γh γd γsNFP94-050 NFP 94-054
15,47 28,376 12,32 16,06 0,80 2,620
γd (95% OPM)
Ouv. tamis (mm) 40 25 20 10 8 5 2 1 0,5 0,25 0,125 0,08Passants (%) 100,0 100,0 100,0 95,7 94,5 92,3 90,6 89,8 88,1 73,6 43,7 39,0
Ouv. tamis (mm) 0,073 0,053 0,039 0,025 0,018 0,013 0,009 0,006 0,004 0,002Passants (%)
………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………………………
L'ingénieur responsable des essais
NFP 18-598 NFP 94-068 NFP 94-051
Densité sèche max. (t/m 3) Teneur en eau optimale (%) w (%) de saturation Gonflement (%)
ESSAI PROCTOR ESSAI CBR
Teneur en eau w
(%)
Equivalent de sable (ES)
Densité apparente (t/m3)Classification
des sols (GTR)Essai au bleu
(g/100g)
NFP 11-300
RAPPORT D'ESSAIS SUR ECHANTILLON DE SOL
CLIENT N° DOSSIER TITRE DU PROJET OU CHANTIER VISA ING. DATE ESSAIS
Argiles avec des blocs de basaltes altérés
Limites d'Atterberg (%)
NFP 94-053
DESCRIPTION SOMMAIREN° REGISTRE
1.00mG5-1 (SC5)
09/04/2015
OPERATEUR
JICA MAMELLES
OBSERVATIONS
N° SONDAGE N° ECHANT. PROFONDEUR (m)
sable grossier gravier caillouxargile limon sable f in
0
10
20
30
40
50
60
70
80
90
100
0,001 0,01 0,1 1 10 100
% p
assa
nts
diamètre (mm)
A-2-41
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16 20 24 28
A M JK ND B3 PL
90,64 87,47 88,35 88,13 76,43 73,95
82,57 79,7 80,8 80,9 73,5 71,39
55,1 52,6 53,9 54,5 50,86 49,49
8,07 7,77 7,55 7,23 2,93 2,56
27,47 27,1 26,9 26,4 22,64 21,9
29,38 28,672 28,07 27,386 12,9417 11,6895
WL = 28,376 WP = 12,316 IP = 16,06 Ic = 0,80 A =
3- Echelle de consistance (Ic)
4- Echelle d'activité (A)
5- Diagramme de plasticité 6- Classification triangulaire des sols fins
Nomenclature des sols selon SN 670'010a (1993) CH: Argile limoneuse, graveleuse et/ou sableuseCL-ML: Limon argileux avec sable et/ou gravierOL: Limon organique, graveleux et/ou sableux OH: Argile limoneuse organique, graveleuse et/ou sableuseCL: Limon argileux, graveleux et/ou sableux ML: Limon graveleux ou sableux MH: Limon graveleux et/ou sableux de haute plasticité
Limites et indices
Poids Total HumidePoids Total SecPoids total tarePoids net de l'eauPoids matériau secTeneur en eau (%)
G5-1 (SC5) 1.00m
Nombre de coupsN° de la Tare
DESCRIPTION SOMMAIRE
09/04/2015
OPERATEURN° REGISTRE N° SONDAGE N° ECHANT.
CLIENT N° DOSSIER TITRE DU PROJET OU CHANTIER
1- Limite de Liquidité
PROFONDEUR (m)
Argiles avec des blocs de basaltes altérés
JICA MAMELLES
2- Limite de Plasticité
DATE ESSAISVISA ING.
0
10
20
30
40
50
60
0 10 20 30 40 50 60 70 80 90 100
Indi
ce d
e Pl
astic
ité (I
p)
Limite de Liquidité (Wl)
20
30
0 5 10 15 20 25 30
Tene
ur e
n ea
u (%
)
Nombre de coups
-0,1 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1 1,1 1,2 1,3 1,4 1,5 1,6
0,00 0,25 0,50 0,75 1,00 1,25 1,50 1,75 2,00 2,25
très fermefermepâteux (se) dur (e)liquide mou (-olle)
argiles inactives argiles normales argiles actives
>2,0
>1,5
A-2-42
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SENELABO – Rapport d'étude géotechnique n° GT/2015-422
0
0,5
1
1,5
2
2,5
3
0,1 1 10 100 1000 10000
tass
emen
t ∆h
(mm
)
temps mn (logt)
courbe tassement - temps
1000 kPa (18 kg)
830 kPa (15 kg)
55,5 kPa (1 kg)
277 kPa (5 kg)
555 kPa (10 kg)
27,8 kPa (0,5 kg)
111 kPa (2 kg)
A-2-45
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(réalisé conformément à la norme NF P 94-071-1)
Projet / Chantier: CLIENT
Site: Date essai:
N° Sondage: G5-1 (SC5) Prof. : N°Registre Vitesse de cis. =
Caractéristiques de l'éprouvette
Hauteur = mesuré = estimé =
Après cisaillement
ρh (T/m3)
ρd (T/m3) w (%) e Srρd
(T/m3)t100
(mn)w (%) τf ,p
(kPa)δl f ,p (mm)
τf ,f (kPa)
δl f ,f (mm)
1 2,22 1,925 15,47 0,403 48,61 61,097 5 61,097 5
2 2,19 1,900 15,47 0,4207 104,18 95,61 3,2 95,61 5
3 2,14 1,852 15,47 0,4576 200,02 121,26 2,6 121,26 5
4
cuu p cuu f Φuu p Φuu f
47,60 47,60 20,96 20,96
Observations:
60 mm
N° σ' (kPa)
ESSAI DE CISAILLEMENT RECTILIGNE – CISAILLEMENT DIRECT
Largeur, diamètre =
Avant essai Après consolid Paramètres de résistance au cisaillement
20 mm
1.00 m
ρ s
0.5 mm/mn
JICA
Mamelles, Dakar
Construction d'une Usine
Résultats
L'ingénieur responsable des essais:
cohésion (kPa)angle
frottement interne Φ' (°)
2,700 T/m3
0
100
200
0
τ(k
Pa)
δl (mm)
P1 P2 P3
-0,5-0,4-0,3-0,2-0,1
00 1 2 3 4 5 6
tass
emen
t (m
m)
δl (mm)P1 P2 P3
y = 0,3831x + 47,599
y = 0,3831x + 47,599
0,00
20,00
40,00
60,00
80,00
100,00
120,00
140,00
0 50 100 150 200 250
rési
stan
ce a
u ci
saill
emen
t τ(k
Pa)
contrainte normale σ' (kPa)
pic final Linéaire (pic) Linéaire (final)
A-2-46
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Poids spécifique
WL WP IP Ic γh γd γsNFP94-050 NFP 94-054
25,06 1,751 1,400 2,541
γd (95% OPM)
Ouv. tamis (mm) 40 25 20 10 8 5 2 1 0,5 0,25 0,125 0,08Passants (%) 100,0 100,0 100,0 95,8 99,2 97,1 89,9 84,4 80,2 74,7 65,5 60,4
Ouv. tamis (mm) 0,073 0,053 0,039 0,025 0,018 0,013 0,009 0,006 0,004 0,002Passants (%)
………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………………………
L'ingénieur responsable des essais
OBSERVATIONS
N° SONDAGE N° ECHANT. PROFONDEUR (m) DESCRIPTION SOMMAIREN° REGISTRE
7.00mG20-1' (SC7)
09/04/2015
OPERATEUR
JICA MAMELLES
Laterite
Limites d'Atterberg (%)
NFP 94-053
RAPPORT D'ESSAIS SUR ECHANTILLON DE SOL
CLIENT N° DOSSIER TITRE DU PROJET OU CHANTIER VISA ING. DATE ESSAIS
ESSAI PROCTOR ESSAI CBR
Teneur en eau w
(%)
Equivalent de sable (ES)
Densité apparente (t/m3)Classification
des sols (GTR)Essai au bleu
(g/100g)
NFP 11-300
Densité sèche max. (t/m 3) Teneur en eau optimale (%) w (%) de saturation Gonflement (%)
NFP 94-068
2,2
NFP 94-051NFP 18-598
sable grossier gravier caillouxargile limon sable f in
0
10
20
30
40
50
60
70
80
90
100
0,001 0,01 0,1 1 10 100
% p
assa
nts
diamètre (mm)
A-2-47
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SENELABO – Rapport d'étude géotechnique n° GT/2015-422
(réalisé conformément à la norme NF P 94-071-1)
Projet / Chantier: CLIENT
Site: Date essai:
N° Sondage: Sc Prof. : N°Registre Vitesse de cis. =
Caractéristiques de l'éprouvette
Hauteur = mesuré = estimé =
Après cisaillement
ρh (T/m3)
ρd (T/m3) w (%) e Srρd
(T/m3)t100
(mn)w (%) τf ,p
(kPa)δl f ,p (mm)
τf ,f (kPa)
δl f ,f (mm)
1 1,72 1,593 8 0,6953 0 48,61 70,891 5 70,891 5
2 1,77 1,639 8 0,6475 0 104,18 95,61 3,2 95,61 5
3 1,77 1,639 8 0,6475 0 200,02 139,92 2,6 139,92 5
4
cuu p cuu f Φuu p Φuu f
48,44 48,44 24,54 24,54
Observations:
Résultats
L'ingénieur responsable des essais:
cohésion (kPa)angle
frottement interne Φ' (°)
2,700 T/m3
ρ s
0.5 mm/mn
JICA
G20-1 PRIME 13/05/2015
Mamelles
60 mm
N° σ' (kPa)
ESSAI DE CISAILLEMENT RECTILIGNE – CISAILLEMENT DIRECT
Largeur, diamètre =
Avant essai Après consolid Paramètres de résistance au cisaillement
20 mm
7,00m
0
100
200
0
τ(k
Pa)
δl (mm)
P1 P2 P3
-0,59,5
19,529,539,549,559,569,5
0 1 2 3 4 5 6
tass
emen
t (m
m)
δl (mm)
P1 P2 P3
y = 0,4566x + 48,444
y = 0,4566x + 48,4440,00
20,00
40,00
60,00
80,00
100,00
120,00
140,00
160,00
0 50 100 150 200 250
rési
stan
ce a
u ci
saill
emen
t τ(k
Pa)
contrainte normale σ' (kPa)
pic final Linéaire (pic) Linéaire (final)
A-2-48
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Poids spécifique
WL WP IP Ic γh γd γsNFP94-050 NFP 94-054
32,25 2,288 1,730 2,551
γd (95% OPM)
Ouv. tamis (mm) 20 16 12,5 10 8 5 2 1 0,5 0,25 0,125 0,08Passants (%) 93,5 91,1 86,3 85,1 82,7 78,2 70,6 65,3 59,3 51,6 41,9 37,5
Ouv. tamis (mm) 0,073 0,053 0,039 0,025 0,018 0,013 0,009 0,006 0,004 0,002Passants (%)
………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………………………
L'ingénieur responsable des essais
NFP 18-598 NFP 94-068
0,99
NFP 94-051
Densité sèche max. (t/m 3) Teneur en eau optimale (%) w (%) de saturation Gonflement (%)
ESSAI PROCTOR ESSAI CBR
Teneur en eau w
(%)
Equivalent de sable (ES)
Densité apparente (t/m3)Classification
des sols (GTR)Essai au bleu
(g/100g)
NFP 11-300
RAPPORT D'ESSAIS SUR ECHANTILLON DE SOL
CLIENT N° DOSSIER TITRE DU PROJET OU CHANTIER VISA ING. DATE ESSAIS
Argile avec des concrétion de basalte altéré
Limites d'Atterberg (%)
NFP 94-053
DESCRIPTION SOMMAIREN° REGISTRE
10.4mG20-1' (SC7)
09/04/2015
OPERATEUR
JICA MAMELLES
OBSERVATIONS
N° SONDAGE N° ECHANT. PROFONDEUR (m)
sable grossier gravier caillouxargile limon sable f in
0
10
20
30
40
50
60
70
80
90
100
0,001 0,01 0,1 1 10 100
% p
assa
nts
diamètre (mm)
A-2-49
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(réalisé conformément à la norme NF P 94-071-1)
Projet / Chantier: CLIENT
Site: Date essai:
N° Sondage: Sc Prof. : N°Registre Vitesse de cis. =
Caractéristiques de l'éprouvette
Hauteur = mesuré = estimé =
Après cisaillement
ρh (T/m3)
ρd (T/m3) w (%) e Srρd
(T/m3)t100
(mn)w (%) τf ,p
(kPa)δl f ,p (mm)
τf ,f (kPa)
δl f ,f (mm)
1 1,72 1,593 8 0,6953 0 48,61 69,026 5 69,026 5
2 1,77 1,639 8 0,6475 0 104,18 90,946 3,2 90,946 5
3 1,77 1,639 8 0,6475 0 200,02 177,69 2,6 177,69 5
4
cuu p cuu f Φuu p Φuu f
25,73 25,73 36,44 36,44
Observations:
60 mm
N° σ' (kPa)
ESSAI DE CISAILLEMENT RECTILIGNE – CISAILLEMENT DIRECT
Largeur, diamètre =
Avant essai Après consolid Paramètres de résistance au cisaillement
20 mm
10,40 m
ρ s
0.5 mm/mn
JICA
G20-1' (SC7) 13/05/2015
Mamelles
Résultats
L'ingénieur responsable des essais:
cohésion (kPa)angle
frottement interne Φ' (°)
2,700 T/m3
0
100
200
0
τ(k
Pa)
δl (mm)
P1 P2 P3
-0,5-0,4-0,3-0,2-0,1
00 1 2 3 4 5 6
tass
emen
t (m
m)
δl (mm)
P1 P2 P3
y = 0,7383x + 25,734
y = 0,7383x + 25,7340,00
20,00
40,00
60,00
80,00
100,00
120,00
140,00
160,00
180,00
200,00
0 50 100 150 200 250
rési
stan
ce a
u ci
saill
emen
t τ(k
Pa)
contrainte normale σ' (kPa)
pic final Linéaire (pic) Linéaire (final)
A-2-50
Page 56 sur 107
SENELABO – Rapport d'étude géotechnique n° GT/2015-422
ANNEXE 3 :
Results of triaxial tests
A-2-51
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
Appendix 2 Survey result
Appendix 2-3 Results of Oceanographic Survey
1. Results of Water Quality Measurement
The data of the seawater quality measurement carried out in March and June of 2015 is shown in the
following table. The samples were collected at the location 300 m from shoreline, and its water depth was
between 5 m and 10 m.
No. Items March 12th, 2015 June 9th , 2015 1 Temperature 16 °C 24 °C 2 pH 7.9 8.2 3 DO 2.8 (mg/L) 3.0 (mg/L) 4 Salinity 33 (mg/L) 33 (mg/L) 5 SS 3.3 (mg/L) 170 (mg/L) 6 Electrical conductivity 54 – 57 (mS/m) 54 – 57 (mS/m) 7 TDS 43 (g/L) 37 (g/L) 8 Ca2+ 400 (mg/L) 410 (mg/L) 9 Mg2+ 1200 (mg/L) 1290 (mg/L) 10 Na+ 10680 (mg/L) 11090 (mg/L) 11 SO4
2- 2860 (mg/L) 3100 (mg/L) 12 Cl- 18800 (mg/L) 19600 (mg/L) 13 Mn2+ 0.31 (mg/L) 0.63 (mg/L) 14 Cu2+ 0.29 (mg/L) 0.22 (mg/L) 15 Sr2+ 14 (mg/L) 14 (mg/L) 16 Fe 0.2 (mg/L) 0.4 (mg/L) 17 HCO3- 146 (mg/L) 146 (mg/L) 18 Si, SiO2, SiO3 0.9 (mg/L) 0.1 (mg/L) 19 B 3.9 (mg/L) 4.2 (mg/L)
2. Results of Sea Bottom Environment Survey
The diving survey was conducted in April 9th and 10th of 2015, and the condition of the sea bottom was
recorded along with the construction site of seawater intake and brine discharge facilities.
The survey was carried out in the sections given below.
The Coordinates of Survey Points Survey Point Coordinates
Point 1 Shoreline
Point 2 14°43'22.40''N 17° 30' 24. 20''W.
Point 3 14° 43' 16. 90''N 17° 30' 32.80''W.
Point 4 14° 43' 11. 20''N 17° 30' 41 .00''W.
A-2-57
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
The pictures of the sea bottom are shown below.
Point 1 - Point 2 Point 1 - Point 2
Point 1 - Point 2 Point 1 - Point 2
Point 2 - Point 3 Point 2 - Point 3
Point 3 - Point 4 Point 3 - Point 4
A-2-58
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
Appendix 4
Appendix4-1Minutes of Meeting on the Commencement of Preparatory Survey for the Mamelles Sea
Water Desalination Plant Construction Project in the Republic of Senegal
A-4-1
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
A-4-2
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
A-4-3
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
A-4-4
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
A-4-5
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
Appendix 4
Appendix 4-2 Presidential Decree of Exploitation of the Land for Mamelles Seawater Desalination
Plant Construction Project
A-4-6
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
A-4-7
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
A-4-8
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
Republic of Senegal One People One Aim One Faith Ministry of Economy, Finances and Planning General Directorate of Tax and Domains
Presentation Report
The Senegalese National Water Company (SONES) has conducted a Study under the Master
Plan for Water Resources Mobilization in Dakar Region and the Petite Côte, hereinafter
refered to as " Étude du Schéma Directeur de Mobilisation des Ressources en Eau de la
Région de Dakar et de la Zone de la Petite Côte ".
Under this framework, it was decided the construction of a Sea Water Reverse Osmosis
Desalination Plant with a capacity of 50,000 m3/day extensible to 100,000 m3/day, in a site
located in Dakar and called “Mamelles”.
The above mentioned project is funded through a Seventy Five Billion F.CFA
(75,000,000,000 F.CFA), a loan provided by the Japanese International Cooperation Agency
(JICA) which under this perspective requested to the Senegalese Side to obtain the Decree of
Public Utility on June, 30th 2015 at the latest.
The site visit enabled noticing that buildings belonging to the State and some private owners
were part of the land targeted for the project.
Therefore, it has been deem necessary to declare the above mentioned project as a project of
Public Utility, to list the state property buildings and to proceed to an expropriation of
buildings belonging to private owners which are necessary for the project implementation.
As the responsible for the above mentioned tasks, the Commission in charge of State Property
Control gave a positive response during the meeting session held on September, 16th 2014.
The “Commodo and Incommodo Survey” launched on May, 29th 2015 in compliance with the
Decree N° 1508/MEF/DGIDG/DD, was conducted from June 03rd to 10th 2015 and registered
some comments from the Company called MA KHARAFI ET SONS which members
requested that prior EIE Studies need to be conducted before the project implementation (in
Translated in English
A-4-9
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
compliance with the Minutes of Survey opening and closing n° 002225/DGID/DRD/CSF/
NGA of June 12th 2015), given the fact that the area is dedicated to tourism and fishing
activities and due to the project proximity to their ongoing-construction hotel.
While waiting for SONES to conduct the EIE Study for the Project and with a need to meet
requirements of the Japanese Side which is to obtain the Order or Decree of Public Utility on
June 30th at the latest, it is thus necessary to postpone the declaration of assignability of
private properties within the area targeted for the project.
Thus, the draft Decree hereafter enclosed prepared in compliance with the content of Article 3
of Law n°76-67 issued on July 02nd 1976 relating to the Expropriation for need of Public
Utility and to other Public Utility land operations is issued to declare the construction of the
Sea Water Reverse Osmosis Desalination Plant as project of Public Utility.
A-4-10
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
REPUBLIC OF SENEGAL
One People One Aim One Faith
DECREE N° 2015-1146
Declares the Construction Project of the Sea Water Reverse Osmosis Desalination Plant in
Mamelles area in Ouakam Municipality of Public Utility;
THE PRESIDENT OF THE REPUBLIC,
IN VIEW of Constitution;
IN VIEW of Law N°64-46 of June 17th 1964 relating to the Public Domain;
IN VIEW of Law N°76-66 of July 02nd 1976 relating to the Code of State Property;
IN VIEW of Law N°76-67 of July 02nd 1976 relating to the Expropriation for need of Public
Utility, and to other Public Utility land operations;
IN VIEW of Law N°2011-07 of March 30th 2011 relating to scheme of land property;
IN VIEW of Law n°64-573 of July 30th implementing Law N°64-46 of June 17th 1964 relating
to National Domain especially in its Articles 29, 36 and followings;
IN VIEW of Decree N°77-563 of July 03rd 1977 implementing the above mentioned Law
76-67 of July 02nd;
IN VIEW Decree N°81-557 of May 1981 implementing the State property Code concerning
the private property of the State amended by Decree N°89-001 of January 03rd 1989;
IN VIEW of Decree N°2014-845 of July 06th 2014 relating to the nomination of the Prime
Minister;
IN VIEW of Decree N°2014-845 of July 9th 2014 relating to distribution of the State services
and control of publics institutions, national companies and public companies with common
involvement of the President and Prime Minister’s office along with other Ministries,
amended by Decree N° 2015-299 of March 06th 2015;
IN VIEW of Decree 2015-855 of June 22th 2015 relating to Government composition;
IN VIEW of the request of the concerned party or institution;
A-4-11
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
IN VIEW of the positive response of the Commission in charge of the Control of State
Property during the meeting session held on September 16th 2014;
IN VIEW of the decision of opening and closing of the “Commodo and Incommodo Survey”
N° 1508/MEF/DGIDG/DEDT of May 29th 2015;
IN VIEW of the Public Notice N° 2009/DGIDDRD/CFS NGA of June 1st 2015;
IN VIEW of the “Commodo and Incommodo Survey Minutes” N°2225
DGID/DRD/CSF/NGA of June 12th 2015;
On the report of the Ministry of Economy, Finances and Planning;
DECREES THAT
Article 1 The construction of the Sea Water Reverse Osmosis Desalination Plant in Mamelles
area located in Ouakam Municipality by SONES is declared as a Project of Public Utility.
Article 2 Expropriation of private land located within the project area shall be carried out
within a three-year period
Article 3 The Ministry of Economy, Finances and Planning is in charge of this Decree’s
implementation which will be published in the official newspaper of the Republic of Senegal
Dakar, August 03rd 2015
By The President of the Republic Macky SALL
The Prime Minister Mahammed Boun Abdallah DIONN
A-4-12
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
Appendix 4
Appendix 4-3 Hydraulic Calculation (Seawater Transmission Pipeline)
Lo
catio
n N
o.:
Seaw
ater
Tra
nsm
issi
on P
ipel
ine
(Sea
wat
er T
rans
mis
sion
Pum
ping
Sta
tion
to S
eaw
ater
Rec
eivi
ng T
anks
)D
eman
d (m
3 /h):
5,38
0Pu
mp
Cap
acity
(m3 /h
):5,
380.
00LW
L at
suct
ion
pit (
EL)
-3.6
0D
eman
d (L
/s):
1,49
4.44
Pum
p C
apac
ity (L
/s):
1,49
4.44
HW
L at
seaw
ater
rece
ivin
g ta
nk (E
L)53
.00
Pum
p H
ead
(m):
62.0
0(6
2m a
ccor
ding
to M
r Sat
o's e
stim
ate,
201
5/7/
17)
Loss
aro
und
pum
p (m
)1.
50[H
azen
-Will
iam
s's E
quat
ion]
Pipe
Dia
.Fl
ow F
acto
rO
utflo
w R
ate
Flow
Rat
ePi
pe L
engt
hV
eloc
ityH
yd. G
raid
.H
ead
Loss
Dyn
amic
Hea
dD
ynam
ic H
ead
Cen
ter o
f PL
Gro
und
Effe
ctiv
e H
ead
d (m
m)
Cq
(L/s
)Q
(L/s
)L
(m)
V (m
/s)
I(‰)
⊿h(
m)
H (m
)EL
(m)
EL(m
)EL
he (m
)62
.00
58.4
0To
SW
RO
Pla
ntSt
12
1,10
01.
560
.50
56.9
03.
435.
9353
.47
Loss
aro
und
pum
pSt
12
1,10
014
94.4
41.
573
0.03
60.4
756
.87
3.43
5.93
53.4
445
°St
12
1,10
014
94.4
41.
573
0.03
60.4
456
.84
3.43
5.93
53.4
145
°St
12-
St39
1,10
014
014
94.4
413
5.00
1.57
31.
50.
2060
.24
56.6
423
.99
26.5
432
.65
St39
0.02
60.2
256
.62
23.9
926
.54
32.6
330
°St
39-
St78
1,10
014
014
94.4
419
0.00
1.57
31.
50.
2959
.93
56.3
334
.09
38.1
122
.24
St78
0.06
59.8
756
.27
34.0
938
.11
22.1
860
°St
78-
St15
91,
100
140
1494
.44
350.
001.
573
1.5
0.53
59.3
455
.74
42.0
846
.14
13.6
6St
159
0.08
59.2
655
.66
42.0
846
.14
13.5
870
°St
159
-16
51,
100
140
1494
.44
25.0
01.
573
1.5
0.04
59.2
255
.62
42.0
846
.11
13.5
4St
165
0.04
59.1
855
.58
42.0
846
.11
13.5
050
°St
165
-St
196
1,10
014
014
94.4
414
0.00
1.57
31.
50.
2158
.97
55.3
744
.33
49.3
811
.04
St 1
960.
1458
.83
55.2
344
.33
49.3
810
.90
90°
St19
6-
St20
51,
100
140
1494
.44
40.6
61.
573
1.5
0.06
58.7
755
.17
45.3
850
.00
9.79
St 2
050.
0158
.76
55.1
645
.38
50.0
09.
7815
°St
205
-St
215
1,10
014
014
94.4
452
.28
1.57
31.
50.
0858
.68
55.0
846
.23
50.0
08.
85St
215
0.11
58.5
754
.97
46.2
350
.00
8.74
80°
St21
5-
St 2
301,
100
140
1494
.44
72.2
21.
573
1.5
0.11
58.4
654
.86
47.4
050
.00
7.46
St23
00.
1458
.32
54.7
247
.40
50.0
07.
3290°
St23
00.
1458
.18
54.5
847
.40
50.0
07.
1890°
St23
00.
1458
.04
54.4
447
.40
50.0
07.
0490°
St23
0-
St 2
311,
100
140
1494
.44
3.19
1.57
31.
50.
0058
.04
54.4
447
.45
50.0
06.
99St
231(
Tank
)0.
1357
.91
54.3
147
.45
50.0
01.
31Fl
owou
t
Inta
ke P
SSW
RO
pla
nt12
9,12
012
9,12
01,
494.
441,
494.
44St
12St
231
Nod
e no
.R
emar
ks
Flow
Rat
e (m
3 /day
)(L
/sec
ond)
Nod
e N
o.
A-4-13
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
Appendix 4-3 Hydraulic calculation (Product Water Transmission Pipeline)
Loca
tion
No.
:Pr
oduc
t Wat
er T
rans
miss
ion
Pipe
line
(Pro
duct
Wat
er S
uppl
y Ta
nk to
New
Mam
elle
s Res
ervo
ir )
Dem
and
(m3 /h
):2,
217
Pum
p Ca
paci
ty (m
3 /h):
2,21
6.67
LWL
at su
ctio
n pi
t (EL
)49
.00
Dem
and
(L/s
):61
5.74
Prod
uct w
ater
PS
- St 1
06Pu
mp
Capa
city
(L/s
):61
5.74
HW
L at
Mam
elle
s Res
ervo
ir (E
L)66
.40
Dem
and
(L/s
):1,
231.
48St
106
- St
110
Pum
p H
ead
(m):
22.0
0(2
2m a
cord
ing
Mr S
ato's
est
imat
e, 2
015/
7/17
)Lo
ss a
roun
d pu
mp
(m)
1.50
[Haz
en-W
illia
ms's
Equ
atio
n]Pi
pe D
ia.
Flow
Fac
tor
Out
flow
Rat
eFl
ow R
ate
Pipe
Len
gth
Vel
ocity
Hyd
. Gra
id.
Hea
d Lo
ssD
ynam
ic H
ead
Dyn
amic
Hea
dCe
nter
of P
LG
roun
d Ef
fect
ive
Hea
dd (m
m)
Cq
(L/s
)Q
(L/s
)L
(m)
V (m
/s)
I(‰)
⊿h(
m)
H (m
)EL
(m)
EL(m
)EL
he (m
)22
.00
71.0
0To
Mam
elle
s res
ervo
irsP2
51.
520
.50
69.5
047
.25
50.0
022
.25
Loss
aro
und
pum
pP2
5-
P24
800
110
615.
744.
741.
225
2.2
0.01
20.4
969
.49
47.1
650
.00
22.3
3P2
40.
0820
.41
69.4
147
.16
50.0
022
.25
90°
P24
-P1
680
011
061
5.74
38.7
51.
225
2.2
0.09
20.3
269
.32
46.4
550
.00
22.8
7P1
60.
0720
.25
69.2
546
.45
50.0
022
.80
80°
P16
-P6
800
110
615.
7452
.28
1.22
52.
20.
1220
.13
69.1
345
.48
50.0
023
.65
P60.
0020
.13
69.1
345
.48
50.0
023
.65
15°
P6-
480
011
061
5.74
36.8
51.
225
2.2
0.08
20.0
569
.05
43.9
349
.36
25.1
24
0.08
19.9
768
.97
43.9
349
.36
25.0
490
°4
-45
800
110
615.
7419
5.00
1.22
52.
20.
4319
.54
68.5
444
.21
47.4
424
.33
450.
0019
.54
68.5
444
.21
47.4
424
.33
20°
45-
9480
011
061
5.74
235.
001.
225
2.2
0.52
19.0
268
.02
54.6
857
.00
13.3
494
0.08
18.9
467
.94
54.6
857
.00
13.2
690
°94
-10
680
011
061
5.74
59.6
21.
225
2.2
0.13
18.8
167
.81
58.7
961
.72
9.02
106
1,00
011
012
31.4
834
.76
1.56
82.
60.
4418
.37
67.3
758
.79
61.7
28.
58C
onne
ctio
n to
exi
sting
syste
m
106
-10
71,
000
110
1231
.48
34.7
61.
568
2.6
0.09
18.2
867
.28
58.7
960
.85
8.49
Eist
ing
syst
em10
70.
0118
.27
67.2
759
.15
60.8
58.
1225
°, Ex
istin
g sy
stem
107
-10
81,
000
110
1231
.48
124.
161.
568
2.6
0.32
17.9
566
.95
60.4
562
.75
6.50
Exis
ting
syte
m10
80.
1417
.81
66.8
160
.45
62.7
56.
3690
°, Ex
istin
g sy
tem
108
-10
91,
000
110
1231
.48
39.6
91.
568
2.6
0.10
17.7
166
.71
60.9
465
.20
5.77
Exis
ting
syte
m10
90.
1417
.57
66.5
760
.94
65.2
05.
6390
°, Ex
istin
g sy
tem
109
-11
01,
000
110
1231
.48
3.59
1.56
82.
60.
0117
.56
66.5
660
.94
65.2
05.
62Ex
istin
g sy
tem
110
0.13
17.4
366
.43
60.9
465
.20
0.03
Flow
-out
, Exi
sting
syste
m
Prod
uct w
ater
PS
53,2
0053
,200
106,
400
106,
400
615.
7461
5.74
1,23
1.48
1,23
1.48
St P
25St
106
St10
6St
110
Flow
Rat
e (m
3 /day
)(L
/sec
ond)
Nod
e N
o.
Nod
e no
.Re
mar
ks
A-4-14
Republic of Senegal Preparatory Survey for Mamelles Sea Water Desalination Plant Construction Project Final Report Appendix
Appendix 4-3 Hydraulic calculation (Brine Discharge Pipeline)
Lo
catio
n N
o.:
Brin
e D
isch
arge
Pip
elin
e (E
fflue
nt T
ank
to V
alve
Pit
of S
eaw
ater
Tra
nsm
issi
on P
umpi
ng S
tatio
n )
Dem
and
(m3 /h
):6,
316
Pum
p Ca
paci
ty (m
3 /h):
6,31
6.42
LWL
at E
fflu
ent t
ank
(EL)
49.0
0D
eman
d (L
/s):
1,75
4.56
Efflu
ent t
ank(
St 2
15) -
St 1
1Pu
mp
Capa
city
(L/s
):1,
754.
56EL
of C
ente
r lin
e of
Eff
luen
t pip
e at
St 1
13.
43A
ctua
l Hea
d (m
):45
.57
Loss
aro
und
Efflu
ent t
ank
(m1.
50[H
azen
-Will
iam
s's E
quat
ion]
Pipe
Dia
.Fl
ow F
acto
rO
utflo
w R
ate
Flow
Rat
ePi
pe L
engt
hV
eloc
ityH
yd. G
raid
.H
ead
Loss
Dyn
amic
Hea
dD
ynam
ic H
ead
Cent
er o
f PL
Gro
und
Effe
ctiv
e H
ead
d (m
m)
Cq
(L/s
)Q
(L/s
)L
(m)
V (m
/s)
I(‰)
⊿h(
m)
H (m
)EL
(m)
EL(m
)EL
he (m
)45
.57
49.0
0To
Sea
wat
er T
rans
miss
ion
PS
St 2
151,
000
1.50
44.0
747
.50
45.0
050
.00
2.50
Loss
aro
und
Efflu
ent t
ank
St 2
15-
St 2
141,
000
140
1754
.56
20.7
82.
234
3.2
0.07
44.0
047
.43
45.0
050
.00
2.43
St 2
140.
2843
.72
47.1
545
.00
50.0
02.
1590
°St
214
-St
205
1,00
014
017
54.5
645
.69
2.23
43.
20.
1543
.57
47.0
045
.00
50.0
02.
00St
205
0.01
43.5
646
.99
45.0
050
.00
1.99
15°
St 2
05-
St 1
961,
000
140
1754
.56
40.6
62.
234
3.2
0.13
43.4
346
.86
44.3
450
.00
2.52
St 1
960.
2843
.15
46.5
844
.34
50.0
02.
2490
°St
196
-St
165
1,00
014
017
54.5
614
0.00
2.23
43.
20.
4542
.70
46.1
342
.03
46.1
14.
10St
165
0.08
42.6
246
.05
42.0
346
.11
4.02
50°
St 1
65-
St 1
591,
000
140
1754
.56
20.0
02.
234
3.2
0.06
42.5
645
.99
42.0
346
.14
3.96
St 1
590.
1642
.40
45.8
342
.03
46.1
43.
8070
°St
159
-St
78
1,00
014
017
54.5
635
5.00
2.23
43.
21.
1441
.26
44.6
934
.04
38.1
110
.65
St 7
80.
1141
.15
44.5
834
.04
38.1
110
.54
60°
St 7
8-
St 3
91,
000
140
1754
.56
190.
002.
234
3.2
0.61
40.5
443
.97
23.9
426
.54
20.0
3St
39
0.03
40.5
143
.94
23.9
426
.54
20.0
030
°St
39
-St
12
1,00
014
017
54.5
613
5.00
2.23
43.
20.
4340
.08
43.5
13.
435.
9340
.08
St 1
20.
0640
.02
43.4
53.
435.
9340
.02
45°
St 1
20.
0639
.96
43.3
93.
435.
9339
.96
45°
St 1
20.
0639
.90
43.3
33.
435.
9339
.90
45°
St 1
20.
0639
.84
43.2
73.
435.
9339
.84
45°
St 1
2-
St 1
11,
000
140
1754
.56
5.00
2.23
43.
20.
0239
.82
43.2
53.
435.
9339
.82
St 1
10.
2839
.54
42.9
73.
435.
9339
.54
90°
Efflu
ent t
ank
151,
594
151,
594
1,75
4.56
1,75
4.56
St 2
15St
11
(L/s
econ
d)N
ode
No.
Nod
e no
.Re
mar
ks
Flow
Rat
e (m
3 /day
)
A-4-15
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