The South African National Standard for the test pumping of water boreholes (SANS 10299-4:2003) clearly prescribes how the testing is to be carried out. Read more
Remember the Department of Water and Sanitation (DWS) will only authorise groundwater use if the above method is used.
This spreadsheet provides a template for the data capture.
Here is a summary of the specifications for test-pumping of boreholes.
4 to 6 x 1 hour steps, each at a different rate – incrementally increasing
During the last step try to draw the water level down to the pump depth.
The yields to use for the steps are:
The planned steps can be adjusted during the test, although the yield during the individual steps must be constant. Yield must be measured at least 3 times during the test to ensure it is constant.
Recovery of the water level after the step test should be monitored till the water level recovers to ~ 1 m hours of the Static water level or for ~ 12 hours.
Constant Discharge Test:
24 - 72 hours at a constant rate
If the water level is drawn down to pump inlet during the Test the pump must be stopped immediately and recovery of the water level monitored.
The constancy of the yield is very important, otherwise the data cannot be analyzed.
Send Step Test drawdown and yield information to GEOSS for assessment, and we will provide the recommended yield of the Constant Discharge Test.
The Water level measurements should be taken and recorded according the attached spreadsheet.
Immediately after the pump is turned off after the pumping test, start measuring water levels.
Measure Recovery until:
The data that needs to be collected includes:
Boreholes close by should have their water levels monitored during the Test. Boreholes in the area should be rested for at least a day before pumping
Water from the borehole must be piped 50 – 100 m down gradient from the borehole so that it does not recharge and affect the test