Digging for water by shallow wells
Where to dig
One of the most important techniques of finding drinkable water in Southern African natural environments is digging for water in areas which are holding water underground. These water holding structures can be situated next to an open water source or below riverbeds, where no open water is visible.
Water contamination can either be mechanical (e.g.: sediments), biological (e.g.: parasites), or chemical (e.g.: elevated metal ion levels).
Cloudy water – avoid dark layers in sand
Mechanical water filtration can either be done by various filtering devices or by digging a hole at least 1 m apart from the open water source at a place, which does not contain any clay, loam, or layers with biological matters, but only pure sand. Digging a depression within an existing open water source is not advisable, as there are always biological or loamy matters at the bottom. And as soon as these are getting disturbed, the water will remain cloudy for a long time. The same holds true for a sandy patch, which contains dark layers (clay, loam, biological matter) underneath the surface. Immediately stop digging and look for a sandy patch without dark layers. Because this water will not turn clean that day.
Water wells dug within silica sand on the other hand will contain water which turns clean very soon. Just remove with a cup the disturbed water and the newly infiltrating water will clean up the mixture – and in a short time just clean water will remain in the dug hole.
Reducing biological hazards when digging water
Obtaining water with reduced biological hazards is done similar to the principles of mechanical water filtration. Most of these biological hazards, like viruses, parasitic cysts and -eggs, nematodes, and others are concentrated within the open water sources and within sediments of biological layers. The surrounding clean silica sand contains only a small fraction of these hazards. Therefore, digging a hole away from the open water source or within river sand reduces drastically the dangers of biological hazards. Water from such holes therefore can be drunk in the South African Lowveld without boiling.
If water has to be boiled due to exposure of biological hazards and it is cloudy, this water should first be cleaned mechanically. A generally known sedimentation filtering device – with a layer of charcoal at the bottom – can be built or a prefabricated device be used.
Chemical water contamination
Chemical contaminations of river water can be a real hazard in downstream areas of mines. There are no easy fixes. Just avoid using such water if it tastes metallic or sulphury. By the way, the scenic Olifants River (flowing through a variety of nature reserves and game parks) is one of the most polluted rivers in South Africa, as its catchment area lays within the main coal mining area, the platinum mining belt and wastewater treatment plants are working inefficiently.
Lessons learned about digging for water
- First consider the lay of the land at which places water could be accumulated
- Elephants prefer to drink the cleanest available water. They therefore dig very often in dry riverbeds. Which is a good indication of a low water table
- If there are dark layers in the sand – just abandon the dig and start new at a place with clean sand throughout
- During nighttime cover the well with heavy stones, so they are not getting contaminated by either Zebras or Baboons