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Groundwater Reserve Determination in the Gouritz WMA: Progress and Insights

This presentation by Koos Vivier, the Groundwater Study Leader, outlines the progress in determining groundwater reserves within selected resource units of the Gouritz Water Management Area (WMA). Key methodologies include using the GRDM database for desktop analysis, selecting quaternary catchments for assessment, and conducting analytical calculations to identify stressed areas. The study incorporates water balance models and stochastic simulations to evaluate groundwater yields and recharge scenarios, providing vital insights into regional water resources and sustainability.

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Groundwater Reserve Determination in the Gouritz WMA: Progress and Insights

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  1. GOURITZ RESERVE DETERMINATION STUDY GOURITZ WMA GROUNDWATER RESERVE DETERMINATION FOR SELECTED GROUNDWATER RESOURCE UNITS OF INTEREST: PROGRESS Presented by: Koos Vivier Groundwater study leader 23 + 24 July 2014

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  5. DESKTOP RESERVE DETERMINATION • Used GRDM (v. 2.3.2, 2013) database to obtain desktop data; • Used quaternary catchments as Desktop Reserve GRUs as is accepted in GRDM methodology (Dennis et al., 2012); • Performed analytical desktop Reserve Determination calculations using database values in Excel; • Created map and list of GRUs; • This provided initial indication of where groundwater stressed areas occur and what regional desktop Reserves look like.

  6. INTERMEDIATE GROUNDWATER RESERVE DETERMINATION FOR SELECTED GROUNDWATER RESOURCE UNITS (GRUs)

  7. CRITERIA USED TO SELECT GRUs • Groundwater Desktop/Rapid Reserve determination; • DWA All towns reconciliation strategy: • Is the town water stressed? • If stressed then what are it’s sources of water? • Known aquifers of importance: • Vermaaks River catchment and KKRWSS; • Peninsula confined aquifer associated with DAGEOS; • WULAs as received per DWA Excel sheet; • DWA existing monitoring borehole results; • Wetlands from FEPA GIS layer.

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  9. SELECTED QUATERNARIES/GRUs TABLED

  10. SOME RESULTS FROM SELECTIVE HYDROCENSUS

  11. INTERMEDIATE RESERVE • 27 quaternary catchments/areas for GRUs selected and finalised for Intermediate Reserve; • Intermediate Reserve in progress and based on: • Analytical water balance (Groundwater Yield Model for the Reserve [GYMR] method) • Stochastic simulations with distributions of flow components e.g. what happens if recharge is lower than normal • Examples of stochastic simulations:

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