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Evaluation and prediction of groundwater movement in Nawabganj area, northwest Bangladesh



Evaluation and prediction of groundwater movement in Nawabganj area, northwest Bangladesh



Gondwana Geological Magazine 16(2): 93-103



Systematic hydrogeological investigations along with computer simulation of lithologs for the evaluation and prediction of groundwater movement were carried out in order to assess the groundwater potentiality of the Nawabganj Upazilla of northwest Bangladesh. Water Head Position (WHP) contour map indicates that the groundwater moves towards the south and southwestern direction from the peripheral regions. Movement of groundwater through the aquifer indicates a higher flow rate (168-84 m (super 3) /day) at the west and southwestern region. A lower flow rate about 0.5 m (super 3) /day is found in the eastern side of present study area. Higher flow rate indicates the higher conductivity and better transmissibility of aquifer in and around the southwestern region of Ganges flood plain. Closely contour of WHP at this corner also corroborated the better hydraulic properties of aquifer. In spite of same amount of rainfall, in some observation wells in and around Barind region, water table was always found at greater depth than that of the flood plain region. The hydraulic conductivity value of top clay, sand, and clay layers are estimated which are approximately 0.4 m/day, 150 m/day, and 0.0004 m/day respectively. The transmissivity of water saturated zone is appreciable high and varies from 8229 m (super 2) /day to 1371 m (super 2) /day. These higher transmissivity values suggested that the aquifers of this area are quite productive and are suitable for large-scale abstraction of groundwater. Result of computer simulated program, FLOWNET also enabled to identify different stream channels, which could be used for proper selecting of productive well sites. The flow rate and pattern of flow lines indicate that the system is nonconserved. This also confirmed that volumes of water entering and leaving are unequal. This model also reveals that a bulk amount of incoming water is artificially abstracted.

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