Sustainable Management of Runoff and Sediment Yield in a Rapidly Urbanizing Residential Area: A Case Study of Malete, Kwara State, Nigeria
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Date
2021
Journal Title
Journal ISSN
Volume Title
Publisher
Uniport Journal of Engineering and Scientific Research
Abstract
Abstract
This study investigated the effects of the application of stone bunds and vegetative filter strip for
sustainable management of runoff and sediment yield generated in Malete watershed, Kwara State,
Nigeria. Soil Water Assessment Tool (SWAT) model interfaced with Geographical Information System
(MapWindow GIS) was employed to simulate and predict the hydrological processes of the watershed into
sub-basins which were further divided into Hydrological response units (HRUs). The model was used to
evaluate the efficacy of the application of stone bund and vegetative filter strip in reducing storm water
generated from the watershed. The outcome of the study showed that the total predicted surface runoff and
sediment yield in the watershed were predicted as 131.53 million m3
and 243.77 t/ha respectively. The
maximum and minimum runoff predicted were 19.89 million m3
and 17.76 million m3
at sub-basins 13 and
7 respectively, and the average runoff predicted value was 16.44 million m
3
. Also, the maximum and
minimum sediment yield in the watershed occurred at sub-basins 41 and 8 having predicted values of
46.40 t/ha and 11.26 t/ha respectively, and the average sediment yield predicted was 30.472 t/ha. The
results revealed that the implementation of stone bunds reduced sediment yield by 93% while vegetative
filter strip reduced it by 37%. In addition, the model could serve as a decision support tool for
stakeholders and relevant local authorities to formulate policies and strategies in the management of
runoff and sediment yield generation in the study area.