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quote:Originally posted by Norman Castlei) Streams that flowed on the surface in prehistoric times have been buried by geological activity over tens of thousands of years. In the present day, water continues to flow underground in narrow channels along the path of the ancient stream, many metres below current ground level. Ground either side of the channel may be virtually dry. True underground rivers are very common in karst formations.
quote:ii) Water flows underground through various structures, including: underground rivers, ancient burried rivers, beds of sand, or gravel, minute fractures in rock, lava tubes and others.
quote:iii) Underground water is comparatively rare and hard to find. Locating a suitable spot for a well is a job for an expert. Random drilling by someone without proper expertise is highly likely to hit a dry spot.
quote:iv) Water supply is extremely variable over a short distance. It is perfectly possible to locate a well that produces several hundred gallons per minute (GPM) while a second well just a few metres away can produce very little or nothing at all.
quote: Rather than being rare, underground water (groundwater) exists almost everywhere and can be found in almost any hole drilled deep enough to pierce the water table. Abundant, rechargable groundwater is more difficult to find- but I wouldn't consider it rare. Not sure what you mean by "expert"- hydrologist, geophysicist, dowser, driller, Uncle Looney? Many people are relatively successful at finding water- but in places "dry" holes can be frustrating.