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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