International Journal of Environment (ISSN: 2186-0009)  


Assessment of groundwater vulnerability in and around Narayanganj town, Bangladesh: Insight into groundwater contamination
Ashraf Ali Seddique and Kazi Matin Ahmed
Abstract:
In Narayanganj town groundwater abstraction has increased significantly from both the shallow Holocene alluvial and deeper Dupi Tila aquifers to the meet the demands of increasing urbanization and industrialization. The present study used Geographical Information System to assess the groundwater vulnerability in and around Narayanganj town. The groundwater setting of Narayanganj town is hydrogeologically complex, with an uneven silty clay aquitard covering an upper aquifer of highly variable thickness, which is separated from a deep aquifer, by a second aquitard. Limited available data and Arc View 3.2 software have been used to produce groundwater resource planning map (GRPM) along with groundwater vulnerability map (GVM) and potential hazardous activities map (PHAM). As all the parameters for conventional vulnerability assessment were not available, selected parameters such as thickness of upper clay, depth to water level and excavation has been considered for producing GVM. Three vulnerability zones i.e. high, moderate and low have been mapped. The moderate vulnerability zone covers most of the area whereas few hot-spot of high vulnerability occurs. A stretch of low vulnerability zone occurs in the central part and along the northern boundary. Potential hazardous activities map has been produced by considering the existing point and diffused pollution sources. Considering the features of the aquifer vulnerability and the potentially hazardous activities component in the context of the city's expansion, regulatory framework and enforcement and water resource realities to produce the GRPM. The GRPM identifies three different zones for future landuse and groundwater development viz. the strictest, intermediate and permissive zones. The results of the study can be used for future landuse and groundwater management planning. The same approach can be used in developing groundwater vulnerability maps for other areas of Bangladesh.
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