The Bonoumin and Gourou watersheds in the
city of Abidjan have been subject to repeated flooding in
recent years. In order to have a better understanding of
the morphometric parameters influencing the
hydrological functioning of these two whatershed, this
manuscript analyses their morphometric characteristics.
The methodology applied consisted in analysing the
digitals elevations models (DEM) of the two watersheds
using GIS. These morphometric characteristics have
been calculated using empirical formulae. It results from
this morphometric analysis that the two watersheds are
elongated in relation to their Gravelius coefficient (2.36
and 2.23 respectively for the Bonoumin and Gourou
watershed). In addition, the relief of these two basins is
dominated on average by low relief and no to gentle
slopes.This leads to
relatively long water concentration times at their
respective outlets. (4H51min44s and 3H51min13s
respectively for the Bonoumin and Gourou watershed).
Keywords : Morphometric Characteristics, Watersheds, Flooding, GIS, DEM.