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Groundwater Modelling in Dhaka : A study to improve an existing groundwater model of Dhaka and to explore its applications

Hermann, K.M. (2016) Groundwater Modelling in Dhaka : A study to improve an existing groundwater model of Dhaka and to explore its applications.

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Abstract:Dhaka, capital of Bangladesh, has evolved into one of the largest megacities in the world over the past decade. However, this rapid growth caused a water supply issue in terms of both scarcity and water quality. To address this water supply issue in Dhaka, a groundwater model was created to acquire a better understanding of the effects of interventions in the water supply. The aim of this study was to improve the groundwater model and explore its application in a scenario study. To improve the model, input data about the wells, recharge from precipitation and rivers was integrated in the model. Thereafter the heads of the model were fitted to observed groundwater levels by adjusting the vertical hydraulic conductivity, horizontal hydraulic conductivity and the vertical anisotropy. Finally the improved model was applied by computing the effects of three possible policies with the model. The improved input data and calibration resulted in a more accurately illustration of the cone of depression by the model. The cone of depression in Dhaka goes as low as 80 meters below surface level with a radius up to 40 km according to the improved model. The model was able to map precise changes in groundwater level caused by possible water supply policies, making it a convenient tool for the local authorities. While the model is much improved, it is necessary to obtain more reliable and recent data about the wells, rivers, recharge, lithology and permeability to minimize the error of the model.
Item Type:Essay (Bachelor)
Faculty:ET: Engineering Technology
Subject:56 civil engineering
Programme:Civil Engineering BSc (56952)
Link to this item:http://purl.utwente.nl/essays/71194
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