Hydrological Vulnerability Assessment of Landfill Site Using GIS: A Case Study of Alimosho Landfill Site

Abstract

Solid waste are disposed in landfills where it decomposes and produces leachate that can contaminate underlying groundwater. This study investigated the effects of open landfill sites on the underground water quality using the DRASTIC L model based on eight parameters. In addition, water samples were collected using systematic random sampling method from hand-dug Wells around the Solous landfill sites in Igando, Alimosho Local Government Area of Lagos State and analysed. A total of thirteen hand-dug Wells were sampled at increasing distances from the landfill site and analyzed for heavy metals. A GARMIN GPS was used to record the latitude and longitude of sampling points which were subsequently imported into a GIS environment and parameters integrated to analyse for vulnerability sensitivity. The results showed that out of a total area of 166.657 hectares under study, about 54.013 hectare were found to be within the low vulnerable zone with a DRASTIC index range between 101 - 123, about 52.225 hectares were observed to be in the moderately vulnerable zone with an index ranging between 123 and 135. About 60.417 hectares were located in high vulnerability zone with an index ranging between 135 and 154.The result of the water analysis showed that while Zinc had the highest concentration, Chromium was not found present in any of the Wells sampled. It is concluded, that the groundwater in the study area has been contaminated. There is therefore the need for adequate and proper planning and strategic management for the disposal of waste.

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Author Information
Esther Oluwafunmilayo Makinde, University of York, United Kingdom
Gbenga Emmanuel Olatunbosun, University of Lagos, Nigeria
Olusegun Temitope Badejo, University of Lagos, Nigeria

• Category: ECSEE2018

Posted by James Alexander Gordon

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