UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Vulnerability of low-arsenic aquifers to municipal pumping in Bangladesh

Knappett, PSK; Mailloux, BJ; Choudhury, I; Khan, MR; Michael, HA; Barua, S; Mondal, DR; ... van Geen, A; + view all (2016) Vulnerability of low-arsenic aquifers to municipal pumping in Bangladesh. Journal of Hydrology , 539 pp. 674-686. 10.1016/j.jhydrol.2016.05.035. Green open access

[thumbnail of Knappett etal 2016 Manuscript accepted.pdf]
Preview
Text
Knappett etal 2016 Manuscript accepted.pdf

Download (2MB) | Preview

Abstract

Sandy aquifers deposited >12,000 years ago, some as shallow as 30 m, have provided a reliable supply of low-arsenic (As) drinking water in rural Bangladesh. This study concerns the potential risk of contaminating these aquifers in areas surrounding the city of Dhaka where hydraulic heads in aquifers >150 m deep have dropped by 70 m in a few decades due to municipal pumping. Water levels measured continuously from 2012 to 2014 in 12 deep (>150 m), 3 intermediate (90-150 m) and 6 shallow (<90 m) community wells, 1 shallow private well, and 1 river piezometer show that the resulting drawdown cone extends 15-35 km east of Dhaka. Water levels in 4 low-As community wells within the 62-147 m depth range closest to Dhaka were inaccessible by suction for up to a third of the year. Lateral hydraulic gradients in the deep aquifer system ranged from 1.7 × 10-4 to 3.7 × 10-4 indicating flow towards Dhaka throughout 2012-2014. Vertical recharge on the edge of the drawdown cone was estimated at 0.21 ± 0.06 m/yr. The data suggest that continued municipal pumping in Dhaka could eventually contaminate some relatively shallow community wells.

Type: Article
Title: Vulnerability of low-arsenic aquifers to municipal pumping in Bangladesh
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jhydrol.2016.05.035
Publisher version: http://doi.org/10.1016/j.jhydrol.2016.05.035
Language: English
Additional information: Copyright © 2016 Elsevier B.V. or its licensors or contributors.
Keywords: Arsenic; Urban groundwater pumping; Deep aquifer; Regional hydrogeology; Asia; Delta
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Inst for Risk and Disaster Reduction
URI: https://discovery.ucl.ac.uk/id/eprint/1501140
Downloads since deposit
112Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item