By United States. Dept. of the Army

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Extra info for Multiservice procedures for well-drilling operations : Army, Navy, Air Force

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Normally, sand and gravel form a large part of the stream alluvium so that wells located in the alluvium are likely to tap a good aquifer or series of aquifers Individual aquifers do not usually extend far, and the number and depth of water-bearing sands and grovels change rapidly from place to place. Alluvium tends to become progressively finer downstream as the stream gradient decreases and the distance from outcrops of rock increases. In lower stream courses far from had-reck highlands, alluvium is mostly silt and clay, with a few sand stringers.

Karst topography results from the dissolution of carbonate rocks by groundwater and is characterized by caves, sinkholes, closed depressions, and disappearing streams (Figure 2-16, page 2-14). These features indicate that the rock has a very high dissolution potential and that groundwater is present. Collapse-type sinkholes (irregular, debris-filled sinkholes) usually indicate the presence of shallow groundwater because they result from the collapse of the surface materials into a dissolution cave.

In most cases, limestone has been fractured and is considered the highest potential source of groundwater from rock. (c) Shale. Shale is fine-grained, does not usually store much groundwater, and does not transmit large quantities of groundwater. Where fractured, shale generally can only produce a few gallons per minute. However, identifying shale units is important because shales could indicate that artesian conditions exist in more productive water-bearing units below or between shale layers.

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