African Journal of
Environmental Science and Technology

  • Abbreviation: Afr. J. Environ. Sci. Technol.
  • Language: English
  • ISSN: 1996-0786
  • DOI: 10.5897/AJEST
  • Start Year: 2007
  • Published Articles: 974

Full Length Research Paper

The impact of sea water intrusion on the spatial variability of the physical and chemical properties of ground water in Limbe-Cameroon

MOTCHEMIEN Rigobert
  • MOTCHEMIEN Rigobert
  • Department of Rural Engineering, National Advanced School of Public Works Buea, Box 324 Buea, SW Region, Cameroon.
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FONTEH Mathias FRU
  • FONTEH Mathias FRU
  • College of Technology, The University of Bamenda, Box 39, Bambili, Mezam Division, NWRegion, Cameroon.
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  •  Received: 23 February 2020
  •  Accepted: 02 April 2020
  •  Published: 30 April 2020

Abstract

A significant proportion of the population of Limbe, a coastal town in Cameroon, relies on ground water (gw) to satisfy their drinking water needs. The coastal aquifer is threatened by pollution from sea water intrusion and hence the aim of this study was to determine the suitability of the water. Physico-chemical analysis were carried out on samples collected from the study area and the Revelle Index was calculated and used to determine the extent of pollution from seawater intrusion. The water quality index (WQI) was calculated using values of the pH, bicarbonate, chloride, total dissolved solids and the electrical conductivity. The results showed that 23% of the groundwater in the study area is slightly polluted by seawater intrusion. Using the WQI, it was found that about 34.4% of the ground water resources in the study area is currently good for drinking while 65.6% is either poor, very poor or unsuitable for drinking. In order to reduce the intrusion of sea water into the aquifer, a halophyte plant like mangrove should be planted at the mouth of the main river in Limbe. 
 
Key words: Coastal aquifer, pollution, salinity, water quality index, Revelle Index.