Groundwater recharge: will the pumps run dry?
The problem Groundwater recharge is one of the most difficult parameters to measure in the assessment of water resources yet is critical for reliable projections of sustainable resource development.
The approach A continent-wide review of more than 200 recharge studies. Where possible the data were extracted to identify relationships between rainfall and recharge, and in particular examine evidence for thresholds controlling recharge.
Key findings The importance of multiple methods; reporting recharge as decadal, rather than annual averages; that while broad relationships exist between average rainfall and recharge, such relationships becomes non-linear when long-term average annual rainfall is less than 1000 mm. Here rainfall intensity becomes particularly important. As future rainfall is expected to intensify with climate change, deeper understanding of the role of episodic high intensity rainfall events in governing recharge will become increasingly important.
Consortium grant? No.
Principal Investigator: Professor Alan MacDonald (British Geological Survey, BGS)
- Prof. Alan MacDonald, British Geological Survey
- Helen Bonsor, British Geological Survey
- Richard Taylor, University College London
- Mike Edmunds, University of Oxford
- Tamiru Abiye, University of Witwatersrand
- Ibrahim Goni, University of Maiduguri
- Seifu Kebede, Addis Ababa University
- Moshood Tijani, University of Ibadan
- British Geological Survey (BGS) – Grant: NE/L002035/1
- University College London (UCL)
- University of Oxford (UO)
- Addis Ababa University (AAU)
- University of Maiduguri (UNIMAID)
- University of Ibadan (UI)
- University of Witwatersrand (UW)
For more information:
- PDF summary:
- presentation by Prof. Alan MacDonald in RWSN-UPGro webinar on Groundwater Recharge, 21 October 2014
- Presentations from The Chronicles workshop at 41st IAH Congress, 2014
- Ayenew, T., S. Mamo, S. Kebede (2014) “Integrated Hydrological and Hydrogeological System Analysis of the Lake Tana Basin, North-western Ethiopia”, at 41st IAH Congress, Marrakech [Abstract]
- Bonsor, H.C., A.M. Macdonald, R.M. Lark, K. Smith, S. Grebby, L. Longuevergne (2014) “Groundwater Storage Changes In The Major African Basins 2003-2011” at 41st IAH Congress, Marrakech (Abstract)
- MACDONALD A.M., T.A. ABIYE, H.C. BONSOR, W.G. DARLING, W.M. EDMUNDS, G. FAVREUX, I. GONI, S. KEBEDE, B. SCANLON, R.G. TAYLOR, M. TIJANI (2014). “Groundwater Recharge In Africa: Identifying Critical Thresholds” at 41st IAH Congress, Marrakech (Abstract)
- Taylor R. G., M. Owor and A. Kapponda (2014) “Rainfall intensity and groundwater recharge: evidence from ground-based observations in East Africa” at 41st IAH Congress, Marrakech (Abstract)
- Tijani, M. N., D. J. Lapworth and A. M. MacDonald (2014) “Hydrochemical and Isotopes Studies of Shallow Basement Aquifers in Nigeria: Implications for Groundwater Recharge” at 41st IAH Congress, Marrakech (Abstract)