Beyond Water Witching

by Robert Anderson, Golder Associates, 4104 148th Ave NE, Redmond, WA 98052,

Serial Information: Civil Engineering—ASCE, 1995, Vol. 65, Issue 7, Pg. 58-60

Document Type: Feature article


Ground-water exploration is usually an uncertain and expensive endeavor. Since late 1993, however, Golder Associates Inc., Redmond, Wash., has been working with time-domain electromagnetics TDEM to locate potential aquifers in the 100-1,000 ft range in the upper Snoqualmie River basin. Results to date show that this method provides exceptional depth penetration, rapid data acquisition and strong computer-modeling capabilities for interpretation and data presentation. It is not only reliable but also environmentally benign and less costly than alternative methods. The first phase of the Snoqualmie project is complete and TDEM surveys are now guiding the implementation of the operation's second phase, which will include more detailed drilling and monitoring studies. The total cost of the project, due for completion in December, will be approximately $615,000.

Subject Headings: Project management | Data collection | Surveys (non-geomatic) | Rivers and streams | Groundwater | Drilling | Construction costs

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