Alison Parker David Nussbaumer Afua Owusu Ian Sutton Understanding longterm changes in Lusakas groundwater levels Method Collect longterm data on Groundwater levels Climate Groundwater abstraction ID: 335535
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Use of groundwater data in Lusaka, Zambia
Alison Parker,
David Nussbaumer, Afua Owusu, Ian SuttonSlide2Slide3Slide4Slide5Slide6
Understanding long-term changes in Lusaka’s groundwater levels
MethodCollect long-term data on:
Groundwater levelsClimateGroundwater abstraction
Analyse using Sen’s Nonparametric Estimator of SlopeSeasonal M
ann KendallSlide7
Data
Data type
Location
Length of recordGroundwater levels
Sheki
Sheki
1 borehole
12 years
Climate
City Airport
Kenneth Kaunda Airport
Since 1950
AbstractionNgwerere4 yearsBorehole commission datesLusakaSince 1960Slide8
Analysis
Groundwater:
Rainfall:
Number of boreholes:
Fallen 1.7m since 2002
Decreasing significantlySlide9
Other data
Private users, irrigation, industry, Water Trusts – could be up to 48% of Lusaka’s water (Shaboko-Mbale 2012)Slide10
So how and why is Lusaka's groundwater changing?
Water levels are decliningBoth abstraction and climate change may be playing a part…..….. but insufficient data to fully support this hypothesis.Slide11
Understand data needs of decision makers and how to improve data management
MethodInterviews with
4 senior engineers from LWSC1 chemist from LWSCAll 10 Water Trust managersSlide12
Capacity
Lack of capacity to understand hydrogeological informationOnly two Water Trust managers have a background in water managementSGwR helping to address thisSlide13
Data collection
Last year none of the then Water Trusts collected water level dateFour started recentlyFour plan toAll monitor chlorine residualsLWSC periodically monitors pH, turbidity, nitrates
Little data sharing or feedbackSlide14
Conclusion
Capacity building in groundwater needed for all decision makersBetter data management systems requiredAlison Parker
a.parker@cranfield.ac.uk
01234 758120