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Etude comparative des couts des aménagements hydro-agricoles dans la vallée du fleuve Sénégal de 1990 à  2008


par El hadji MAR
Ecole Nationale Supérieure D'Agriculture (ENSA) de Thiès (Sénégal) - Ingénieur Agronome 2011
  

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ABSTRACT

The Development of irrigated agriculture, water control and sufficient agricultural production has been a governments' concern for more than forty years through the National Company for the Development and Exploitation of Land in the Delta of the Senegal River Valley and the Faleme (SAED: A State Development Corporation), founded in 1965, and with the help of community donors, major hydraulics investments have been made. Indeed, construction of Diama and Manantali dams and the implementation of irrigation schemes are among other significant assets that could improve the water resources management. However, the high costs of investments often make hypothetical the return on investment. This study aims to understand the hydraulic investments cost since 1990 to 2008 in order to come up with investments cost reduction while ensuring their quality. Thus, twenty-one (21) projects of irrigated perimeters through the four delegations of SAED were studied. A characterization of their components (see on appendix) and the analysis of their various costs through the different contracts reveal that the costs of irrigation's infrastructures are highly variable for both new construction and renovations. The factors favoring this dispersion include:

· The type of perimeter (GA, PIV, AI);

· The irrigated area from (relief);

· The crop plot building (finishing techniques).

Overall, the implementation costs range from 1.775 to 7.615 million per hectare during this period. Note that the introduction of improved PIV and GEP, respectively, replacing the fairly well designed PIV and the existing GMP are among the main reasons of the high cost of some investment. In addition, the decomposition of the cost shows that the cost of earthworks and civil engineering is on average about 80% of the cost per hectare, pumping equipment account for about 15% and control Works near 5% with the exception of Aéré Lao where huge delays were caused requiring amendments to the original contract. In addition, equipment costs and Civil Engineering have doubled after the devaluation to inflation after pumping equipment and civil engineering. The share of the earth system and control work has not suffered as they had influence of the devaluation. Taking a better account of the topography, the design of dikes and a reduction of equipment design flow are among others recommendations that could lowered the investments cost of irrigated perimeters.

Keywords: Senegal River Valley, Cost, irrigation schemes, PIV, GA, GEP

TABLES DES MATIERES

DEDICACES II

REMERCIEMENTS III

RESUME V

ABSTRACT VII

LISTE DES SIGLES ET ACRONYMES XI

LISTE DES TABLEAUX XIII

LISTE DES FIGURES XIV

LISTE DES CARTES XV

INTRODUCTION 1

PREMIERE PARTIE : CONTEXTE DE L'ETUDE 2

I. PROBLEMATIQUE 3

II. OBJECTIFS DE L'ETUDE 4

III. METHODOLOGIE 5

PRESENTATION DE LA VALLEE DU FLEUVE SENEGAL 7

I. SITUATION GEOGRAPHIQUE 8

II. CLIMAT 8

DEUXIEME PARTIE : TYPOLOGIE DES AMENAGEMENTS HYDROAGRICOLES DANS LA VALLEE DU FLEUVE SENEGAL, SITUATION DES MARCHES 13

CHAPITRE I : TYPOLOGIE DES AMENAGEMENTS HYDROAGRICOLES DANS LA VALLEE DU FLEUVE SENEGAL 14

INTRODUCTION 15

I. Grands Aménagements (GA) 16

II. Aménagements Intermédiaires (AI) 16

III. Périmètres Irrigués Villageois (PIV) 16

IV. Périmètres Irrigués Privés (PIP) 17

CHAPITRE II : SITUATION DES MARCHES 21

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