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Use of groundwater data in Lusaka, Zambia Alison Parker, David Nussbaumer, Afua Owusu, Ian Sutton.

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Presentation on theme: "Use of groundwater data in Lusaka, Zambia Alison Parker, David Nussbaumer, Afua Owusu, Ian Sutton."— Presentation transcript:

1 Use of groundwater data in Lusaka, Zambia Alison Parker, David Nussbaumer, Afua Owusu, Ian Sutton

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6 Understanding long-term changes in Lusaka’s groundwater levels Method Collect long-term data on: –Groundwater levels –Climate –Groundwater abstraction Analyse using –Sen’s Nonparametric Estimator of Slope –Seasonal Mann Kendall

7 Data Data typeLocationLength of record Groundwater levelsSheki Sheki 1 borehole12 years ClimateCity Airport Kenneth Kaunda Airport Since 1950 AbstractionNgwerere4 years Borehole commission datesLusakaSince 1960

8 Analysis Groundwater: Rainfall: Number of boreholes: Fallen 1.7m since 2002 Decreasing significantly

9 Other data Private users, irrigation, industry, Water Trusts – could be up to 48% of Lusaka’s water (Shaboko-Mbale 2012)

10 So how and why is Lusaka's groundwater changing? Water levels are declining Both abstraction and climate change may be playing a part….. ….. but insufficient data to fully support this hypothesis.

11 Understand data needs of decision makers and how to improve data management Method Interviews with –4 senior engineers from LWSC –1 chemist from LWSC –All 10 Water Trust managers

12 Capacity Lack of capacity to understand hydrogeological information Only two Water Trust managers have a background in water management SGwR helping to address this

13 Data collection Last year none of the then Water Trusts collected water level date –Four started recently –Four plan to All monitor chlorine residuals LWSC periodically monitors pH, turbidity, nitrates Little data sharing or feedback

14 Conclusion Capacity building in groundwater needed for all decision makers Better data management systems required Alison Parker


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