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Authors:
Déhalé Donatien AZIAN, Jean SODJI, Pierre OUASSA, OTEKPO B. E. Owen, Benin
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Abstract:
The influence
of the rhythm on the water quality of boreholes and wells in the district of
Akassato municipality of Abomey-Calavi is one of the problems faced by the
inhabitants of the study environment. The general objective of this study is to
study the rainfall rhythm and the water quality of boreholes and wells in the
district of Akassato municipality of Abomey-Calavi.
To achieve
this goal, rainfall data from 1981 to 2020 were collected. A direct observation
of the state of play and the administration of a questionnaire allowing to list
the wells and the boreholes according to defined criteria were carried out. The
physical, chemical and bacteriological analyses were carried out respectively
by spectrophotometry, titrimetry and the membrane filtration method. Indeed, 36
wells and 64 boreholes have been inventoried and 267 people have been
investigated.
The results
obtained from the analyzes revealed that the temperature of the well and
borehole water exceeds the recommended norm. These waters are acidic and cloudy
on a physical level. Only the sample from well 2 during the rainy season is
chemically polluted. The microbial germs (Fecal coliforms and Escherichia coli)
sought are strongly present in the analyzed water samples, but the fecal
streptococcal germs did not undergo pollution during the dry and rainy season.
In sum, all the water samples studied are at least polluted by one of the
physical, chemical and / or bacteriological variables and are therefore
unsuitable for direct consumption by humans.
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