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Standing Water Level

 

The standing water level is the height the water rises up the hole when reached by the drill rig. This is the natural level of the water when no pumping is taking place. This level is the distance from the surface of the hole to the top of the water.

Of course this level will drop once pumping commences, but will return to the SWL when the pump is turned off. While pumping is taking place the water in the aquifer will actually form a cone around the bore, the bottom of the cone being towards the screens where the water is being drawn.

Pump selection is very important, because if a pump is installed which is to high inĀ  capacity the draw down will be too great and it will pump air.

In Artesian bores the SWL is above ground level.