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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. PRESENTATION TITLE HERE (if needed). Sub-Title here (if needed).

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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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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.



CRITERIA USED TO SELECT GRUs GROUNDWATER RESOURCE UNITS (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.


PRESENTATION TITLE HERE (if needed) GROUNDWATER RESOURCE UNITS (GRUs)

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SELECTED QUATERNARIES/GRUs TABLED GROUNDWATER RESOURCE UNITS (GRUs)


SOME RESULTS FROM SELECTIVE HYDROCENSUS GROUNDWATER RESOURCE UNITS (GRUs)


INTERMEDIATE RESERVE GROUNDWATER RESOURCE UNITS (GRUs)

  • 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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