Influence of Asa dam on Hydrometeorological Variables in Asa River Basin, Ilorin,
No Thumbnail Available
Date
2007
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Research Information in Civil Engineering: Published by Department of Civil Engineering, University of Ilorin, Ilorin, Nigeria
Abstract
The construction of a dam is usually accompanied by some environmental impacts, this usually
calls for pre- and post- environmental impact studies to quantify the changes that have taken
place. The aim of this study is to assess the influence of Asa dam on Asa River Basin. The
hydro-meteorological aspect of the environmental impact studies was carried out and it involved
collection and analysis of meteorological and hydrological data. The meteorological data were
collected at the Ilorin airport which is within the catchment of Asa river and the hydrological
data were collected at the Kwara State Water Corporation which is the body monitoring the four
stream gauging stations along Asa river. The mean monthly variations of some meteorological
variables such as rainfall, temperature, relative humidity, evaporation, water balance and wind
frequency were analyzed using composite bar chart and the detrending time series analyses. The
time series analysis for post dam condition revealed negative correlation with temperature, wind
speed, evaporation and stream flow. This is an indication that these variables would be
decreasing with time. However, positive correlation exists between the time and rainfall,
humidity and sunshine hour. This implies that there is tendency for these variables to increase as
a result of the construction of the dam.
Description
Keywords
Dam, Hydrological variables, Meteorological variables, Environment