Case study note: Resilience of intensive groundwater abstraction from weathered crystalline rock aquifer systems to climate change in sub-Saharan Africa. - GOV.UK

Case study note: Resilience of intensive groundwater abstraction from weathered crystalline rock aquifer systems to climate change in sub-Saharan Africa. From: Foreign, Commonwealth &

Development Office Published 1 January 2010 Country: Uganda and Tanzania Document Type: Case Study Theme: Climate and Environment First published: 1 January 2010 Authors: Johnson, P.,

MacDonald, A., Taylor, R., Darling, G., Gooddy, D., Maurice, L. and Sanga, H. Contents Abstract Citation Links Abstract

This report describes the methodology and results of the East Africahydrogeological case study, undertaken by University College London andthe British Geological Survey. The aim of this case

study is toinvestigate the resilience of intensive groundwater abstractions fromweathered crystalline rock aquifer systems to climate change. Thesustainability of such abstractions was

investigated by examininghistorical aquifer responses to climate and intensive (> 1 L/s)abstraction, and investigating groundwater residence times at sites ofintensive groundwater

abstraction using multiple tracers:chlorofluorocarbons (CFCs), sulphur hexafluoride and tritium. This casestudy was carried out in Tanzania and Uganda.

This study indicates that sustainable larger supplies are oftenassociated with a thick regolith (often including alluvium) overweathered basement rocks, and that yields of more than 1 l/s

may beavailable in approximately 35% of effectively sited boreholes in theseareas.

Maurice, L.; Taylor, R.; MacDonald, A.; Sanga, H.; Johnson, P.; Darling, G.; Gooddy, D. Case study note: Resilience of intensive groundwater abstraction from weathered crystalline rock

aquifer systems to climate change in sub-Saharan Africa. British Geological Survey, Nottingham, UK (2010) 37 pp. [British Geological Survey Internal Report, XX/00/00]

Links 60826_IR-10-105_HighyieldingSupplies.pdf caseStudy2.html Updates to this page Published 1 January 2010 Contents Explore the topic International aid and development