offgridding

[PDF] understanding groundwater & wells - Unicef

Pipe joints. 27 .... the ground until they are filled, then lifted out of the borehole ... opposed to sludging, water is pumped down the drilling pipes. The .... If the ball falls apart only partially, the soil contains some silt or clay and sand. .... In such cases a type of pump made of PVC, plastic or stainless steel components may be  ...