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Data and Methods

Precipitation

Ground-based Stations

• Department of Water and Sanitation Hydrological Services Division
• NOAA National Centers for Environmental Information, look at Climate Data Online (CDO)

TRMM and GPM

GLDAS Reanalysis and Models

Land Cover Data

DEM

• Earth Explorer

QGIS Analysis

• Download the DEM files in .tif format (Geotiff)
• Open the files in the main window of QGIS

To merge the files:

• Click Raster > Miscellaneous > Merge
• Select all the open DEM files for the input file
• Save the merged DEM to a new file for the output file (do not save to a temporary file)

For Contour Lines:

• Click Raster > Extraction > Contour
• Change interval between contour lines to 100.00 (you can adjust this as you wish - the smaller the interval the longer it will take to run the extraction)
• Save to a new file for output file

Land cover

• SANLC
• Data from Max with Google Earth Engine

SCS Curve Number

Based on the land cover, we need to determine the curve number appropriate to the area.

• TR-55

Hydrologic Model

HEC-HMS

Groundwater Data

Groundwater data have been collected pursuant to a regulation that requires all drillers to submit the borehole log. These data have been collected through the Southern African Development Community Groundwater Management Institute (SADC-GMI): https://sadc-gip.org/maps/

GRACE and GRACE-FO