TITLE:
Risk Assessment of Rainwater Overflow from Lake Warouwaye in the Case of a Ten-Year Rainfall in Yeumbeul North, Senegal
AUTHORS:
Benewende Anthelme Victor Sondo, Saïdou Ndao, Papa Babacar Diop Thioune, El Hadji Bamba Diaw
KEYWORDS:
Flood, Overflow, Warouwaye Lake, Simulation, Epaswmm
JOURNAL NAME:
Open Journal of Modern Hydrology,
Vol.11 No.3,
June
29,
2021
ABSTRACT: This study is a part of a global approach in which,
the main purpose is to understand the reasons behind the upsurge of flood
events in the peri-urban area of the city of Dakar. Hydrological and hydraulics simulations were carried out to assess the
risks of overflowing of the Lake Warouwaye after a so-called exceptional rain. Data
were collected through field surveys, as well as site observations of dwellings
before and after rain episodes. The simulations were performed using EPA’s
Storm Water Management Model (SWMM) software with input data obtained from
sub-software and supervisory applications such as Google Earth, Excel, and
Global Mapper. The simulation results show factors of natural and anthropogenic
origin may contribute to dysfunction hydrological elements such as the
watershed capacity to drain and store water. In light of the results of this
study, institutional governance efforts are to be made and to be sustained in
order to reverse the tendency to occupy rainwater natural flow channels. It
will also be necessary to involve the first actors who are the potential
victims of flooding caused by the recurrent overflow of reservoirs.