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Impacts of Human Development and Climate Change on Groundwater Resources in Bangladesh

  • Mohammad Shamsudduha
Chapter
Part of the Springer Hydrogeology book series (SPRINGERHYDRO)

Abstract

Groundwater has been playing a central role in drinking and irrigation water supplies in Bangladesh for more than four decades. Today, nearly 97% of all drinking water supplies in Bangladesh come from groundwater via hand-operated tubewells that tap the shallow part (<150 m bgl) of the Bengal Aquifer System (BAS). Groundwater-fed irrigation, that currently meets 80% of irrigation water supplies, has been sustaining the dry-season high-yielding “Boro” rice cultivation since the 1970s that has made Bangladesh nearly self-sufficient in food production and led to major economic development. The shallow groundwater is, however, facing major challenges: (1) widespread, natural contamination of arsenic (As) and salinity in coastal areas and (2) rapid depletion of groundwater storage in intensely irrigated areas (e.g., Barind Tract) and major metropolitan cities like Dhaka City. Substantial declines in shallow groundwater levels are currently leading toward an “unsustainable” condition for low-cost pumping technologies (e.g., hand pumps, shallow irrigation wells) and threatening food security. In contrast, intensive dry-season abstraction has also led to increased groundwater recharge by enabling pumping-induced greater infiltrations of rain and surface water during the wet season in areas where surface geologies are permeable and potential recharge is high—realizing the idea of the Ganges Water Machine. Although the impacts of human development of groundwater resources are evident, it is unclear how changing climate will affect groundwater quality and quantity. In addition, recently, there is an increased focus on the development of deep groundwater in Bangladesh to mitigate As and salinity problems. However, little is known about recharge mechanisms and long-term security of the deep groundwater resource in Bangladesh.

Keywords

Groundwater monitoring Dry-season irrigation Groundwater recharge Climate change Bengal Basin 

Notes

Acknowledgements

The author likes to acknowledge the support from the Bangladesh Water Development Board for providing weekly groundwater-level monitoring records. The author acknowledges the USGS’s Global Climate Change Viewer (http://regclim.coas.oregonstate.edu/visualization/) for providing the downscaled Coupled Model Intercomparison Project Phase 5 (CMIP5) temperature data for Bangladesh.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.Institute for Risk and Disaster ReductionUniversity College LondonLondonUK

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