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DEVELOPMENT AND APPLICATION OF BOREHOLE FLOWMETERS FOR ENVIRONMENTAL ASSESSMENT
Molz, F. J. AND S. C. Young. DEVELOPMENT AND APPLICATION OF BOREHOLE FLOWMETERS FOR ENVIRONMENTAL ASSESSMENT. LOG ANALYST January-February:13-23, (1993).
In order to understand the origin of contaminant plumes and infer their future migration, one requires a knowledge of the hydraulic conductivity (K) distribution. n many aquifers, the borehole flowmeter offers the most direct technique available for developing a log of hydraulic conductivity in the horizontal direction. ew electromagnetic flowmeter developed by the Tennessee Valley Authority (TVA) is based on Faraday's law and produces a voltage that is proportional to the velocity of the water passing through the central cylindrical channel of the meter. he threshold velocity of a prototype instrument is less than 8.8 +/- 0.9 cm/min. alculation of a K distribution (granular aquifer) or flowpath distribution (fracture flow) based on flowmeter data is a straightforward process as described herein. pplications of both-spinner and electromagnetic flowmeters to granular and fractured-rock aquifers are described. esults indicate the electromagnetic meter is capable of supplying a new level of detail concerning the K distribution in granular aquifers and flowpath delineation in fractured-rock aquifers. Reprint available at NTIS. PB93185817, EPA/600/J-93/134.
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Record Details:Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Organization:U.S. ENVIRONMENTAL PROTECTION AGENCY
OFFICE OF RESEARCH AND DEVELOPMENT
NATIONAL RISK MANAGEMENT RESEARCH LABORATORY
SUBSURFACE PROTECTION AND REMEDIATION DIVISION
TECHNICAL ASSISTANCE AND TECHNOLOGY TRANSFER BRANCH