'RËPUBLIOUE DU SËNËG.A:L · 2011-01-20 · P',JE1!JE FIN DETUDES: [tudCL du 5YStèL (j)a.. d...

144
'RËPUBLIOUE DU SËNËG.A:L . "'1"" ËCOLE 'POLYTECHNIQUE DE THIËS,' , -' PROJET '. ' DE Ge. 0 31-1 . . . , , FIN ,0 ETUDES o - Ti t re me d "a l i men t a. tion en eau, ----,- ------- - -' , Auteur ...J- V---MO,NIEoeO . ---'-- Gén ie_'--'oC,-,-1 V.i,....>=L __ Date _ " \ ..

Transcript of 'RËPUBLIOUE DU SËNËG.A:L · 2011-01-20 · P',JE1!JE FIN DETUDES: [tudCL du 5YStèL (j)a.. d...

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'RËPUBLIOUE DU SËNËG.A:L

.,~

. "'1""ËCOLE 'POLYTECHNIQUE DE THIËS,'

, -'

PROJET '. 'DE Ge. 0 31-1

. . . , ,

FIN ,0 ETUDESo -

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Titre ---'-~'L.>ooI.)."-""----........",..---.~-""-"me d "alimenta.tion en eau,

----,- ------- - -'

, Auteur ...J-V---MO,NIEœO .---'--

Gén ie_'--'oC,-,-1V.i,....>=L ~__

Date J~4L---'-- _

" \ ..

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DE PlUS\EU:RS SDl\Jl\DNS'

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CHAP\TRl::,: C.ALCUL') DE.S I:)ESOI\'\S E.N E.AU

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CHAPIIRE 5

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ANNE XE. a

. .

No.. ~ ?,,\.,\IO"''' \... \.\\r. O'S ï\·1-l1 l::l.E..I4, oe.......: ...I~·\~..J:.';~\,~\- de..

UN "III:U~LC - UN .UT - U""IE 11'01

!ML~15TlRE DE L'HYDRAULIQUE

-------z-:--=0-0'--':-:=S~--.-.JI.....~ Q "'~_~'.oc,r.H. i

.~:,~t~ -,~::.:~:.-;;:-~.'~_:;, .. __~_:. 1

DAKAR. 1•.......•.....•.1..~..f.CL...1.8..S.2 19 ..

(

A r.!onsieur le Directeur Général de laRégie des Chemins de Fer du SénégalB.P. 175 - TH lE S -

_..d\..\~~ '~""".

'

,,,. ~~~I"I.:1 • R

~. • '1' ';jf'I..K, "Je. 1

CH',~' H p1 I-j

... , 11

Votre demande d'autorisation de constructiJ~." " ... '~.' h"f Ht.I~I"'U.tl~'cl 1 un forage cl 1 exp Lo i tation de 15OmJ/h aux Uri t' I~ '1i, ~,

ateliers de THlES. 1 ,1 ~ ~ 1

1 J'• . .. . - ...... ·7':;)1 "-.le Directeur Géné<al.~.,,;;:~~;~~~~~,_~l'''~::''::'::::-•

Lettre n' 81 du 19-)-82

OBJET/

REF. /

'~}'" ~. :"ttonsieur

J'accuse )'éception de votre lettre en référence qui a retenu toute notreattention.

Après examen du problème par les services techniques de la Direction desEtudes Hydrauliques, il apparaît que l'instruction de votre demande requiert uncOmplément d'information.

Vous n'ignorez pas que, en raison des prélèvements, le niveau de la nappe,yrofonde a subi une baisse importante au cours des 10 dernières années. Cette baisse,:no~le, ·doit se poursuivre dans les années à venir mais, pour en contrôler le rythme} il convient de limiter les prélèvements au strict nécessaire et de~répartir les ouvra- i

ges d'exploitation de manière judicieuse. i

Or, selon une étude récente réalisée dans le cadre du projet d'améliorationde l'alimentation en eau de la ville de THIES, il semblerait que le réseau de distri­bution utilisé par la RCS à THIES soit, en raison de sa.vétusté, sujet à des pertestrès importantes, incompatibles avec une saine gestion du potentiel hydraulique local.I(D~bit nocturne du réseau, c'est à dire hors de toute activité normalement consomma­·tri'Ce d'eau. estimé à 6Om3/h environ).

Par ailleurs, la création d'un nouvel ouvrage à proximité des précèdentsn'est pas forcément en accord avec le plan d'exploitation des ressources à moyen et~ong terme en c~~~~ d'élabor~ti~n.

-':lD -

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dans des conditionsà me faire parvenir

........... ···:I1';·· ..i.·;:.~1----, .

\'garari- 1les do- •

' ..1··'· .

.~.~n·· conaêquence , afin cl' examiner votre demandet'issant .~e renpec t de l'intérêt COlIlDl\Jn, je vous invi te'cumen't's 'sulvan t s :

1°) Description et réphrtition détaillées des besoins en eau de la citéBALLABEY et des ateliers comprenant .notamment : le nombre d'habitants de la cité,le nombre' de branchements particuliers, la ventilation des con~ormnati6ns entre lesdifférents ateliers, et à l'intérieur de ceux-c~, le nompre de postes à usage do­mestique (lavabos, WC, douches, etc) et à usage industriel ainsi que, pour cesderniers, une estimation de la consommation journaliè~e.

. •r."'" ~. '..

2°) Un rapport d'expertise du réseau de distribution, réalisé par laSONEES oU par tout autre organisme agr~é. Ce rapport devra mettre en·évidence lespertee êven tue l Ies enreg Ls t r êes dans le réseau, proposer les' r~~des à apporter 1

en chiffres le coût et les conséquences.

Restant à votre d i spos i t i.on pour' toutparaîtrait nécessaire, je vous prie de croire,1lassuran~e de ma considération distinguée/.-

complément d'information qui vousMonsieur le Directeur Général, à,

i

.... _'...-.-~.~r:r::,;-"HEGIE ~~~..:~J~~':ft~~~ 1J~ .FLii

SERVICE ,o.OIMNISTRATIFET SOCIAl.

<lale .Z~~ ,:tztmi8': lb.-,

-«.

.'.

.'

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ANNEXE. 1

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ANNEXE 3

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-------~_.

2000 si le volume de cons ommat i o n annL.elle se mai n t i ear sera dé 1. ,96 %.

L'évolution annuelle de la consommation se pr-és e n t e comme suit ;.tQ_lçrQ.\l~·t

.'"'.

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~0nsoma~tion domestique Consommation Consoanation Production1 1 1Année PopulatIon ------,-------- toule =ventE \ Pertes lIOyenneParticuliers Bornes-fontaine Industrie AdministrdtO m3/j m3/j a3/j

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1980 ln 700 51 6 767,7 1 427 520 1 320 10 034,7 30 3 010,41 13U45,/1._-_.~ -

1981 136 800 53 7 ?50,4 1 560 576 1 360 10 146. u 30 3 223,92 13 970,32_.

1982 141 000 55 7 755 1 730 Fd3 1 400 11 518 30 3 ~55 .... 14 973,4

1983 145 000 57 8 265 1 831 671 1 427 12 194 30 3 658,2 15 852,2

1984 149 900 59 8 844,1 1 846 746 1 480 12 916,1 30 3 874,83 16 790,93-- ..

1985 154 600 61 9 430,6 1 1 947 784 1 507 13 668,6 30 4 100,58 17 769,18... ._.

1986 159 400 63 10 042,2 1 970 859 1 560 14 431,2 JO u 329,36 18 760,56". ___ "_-0"-

1987 164 300 55 10 679,5 2 035 916 1 600 l' 230,5 30 4 569,15 19 199 , S5--f-_.

1988 169 100 67 Il 329,7 2 103 972 1 640 16 011.4,7 30 u 813,41 2iJ 858,11. - ---

1389 174 700 69 12 054,3 2 148 1 010 1 667 15 879,3 30 5 063,79 21 943, Q9.. _----

11990 180 100 71 12 787,1 2 244 1 085 1 720 17 836,1 30 5 350,83 23 186,93--'-" --

1

1991 185 700 73 13 556,1 2 n~ 1 123 1 747 18 715.1 30 5 614,53 24,329,63--- - ..

1992 191 400 75 14 355 2 394 1 200 l 800 19 749 30 5 614,53 25 673,7-~-

1993 197 300 77 15 192,1 2 439 1 238 1 827 20 696 ,1 30 6 208,83 26 904,93

11394 203 500 79 16,

2 484 1 276 1 854 21 690,5 6 507,15 28 197,65076~_._ 30----

1995 209 800 81 16 993,81

2 521 1 314 1 881 22 717,8 30 6 815,34 29 533,14---_. .. -'-"

199E 216 300 a3 17 952,9 2 574 1 152 1 908 23 786,9 30 7 136,07 30 922,97

------~1

1997 223 000 i 85 18 955 2 619 1 390 1 935 24 899 30 7 469.' 32 368,7_._~_...--_.. -

1 1998 230 000 5"" 20 010___ .. 1 2 664. 1 423 . 1 %; 26 064 30 7 819,2 33 88.1.,.);--

1

'--- '-' - 1

2000 244 400 31 22 240,4 37 068,'2

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