Fundamental Concepts of Well Design

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Abstract
Well performance and production life can be enhanced greatly by proper design and operation. Using screen entrance velocity as the only design criteria is not sufficient for describing flow around the well, and in many cases leads to an overly optimistic design. Approach velocity and turbulence (Reynolds Number) are more direct concepts in regard to the factors influencing long‐term well efficiency, and their use as design criteria is strongly encouraged. In addition, sizing of screen slots and filter materials is haphazardly practiced by too many in the ground‐water industry, and requires a renewed awareness.Distribution of flow along the screen, as well as the vast number of aquifer conditions, are also factors to be considered during design. It is here that the judgement and practical experience of the hydrogeologist are most important.The fundamental design criteria are relatively simple to apply, and for the practicing hydrogeologist, the design process is aided by composite graphs. Several such design graphs are given for convenient reference.

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