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A heat-pulse flowmeter for measuring minimal discharge rates in boreholes

Open-File Report 82-699

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Abstract

The U.S. Geological Survey has tested a borehole-configured heat-pulse flowmeter which has good low-velocity flow-measuring sensitivity. The flowmeter was tested in the laboratory in 51-, 102-, and 152-millimeter-diameter columns using water velocities ranging from 0.35 to 250 millimeters per second. The heat-pulse flowmeter also was tested in a 15-meter-deep granite test pit with controlled water flow, and in a 58-meter-deep borehole in sedimentary materials. The flowmeter's capability to detect and measure naturally occurring, low-velocity, thermally induced convection currents in boreholes was demonstrated. Further improvements to the heat-pulse-flowmeter system are needed to increase its reliability and improve its response through four-conductor logging cable.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
A heat-pulse flowmeter for measuring minimal discharge rates in boreholes
Series title:
Open-File Report
Series number:
82-699
Edition:
-
Year Published:
1982
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
iv, 44 p. ill. ;28 cm.