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On-Demand Webinars

For Assessing Bedrock Stratigraphy and Fracture Hydraulics

Measuring the vertical movement of water in wells and boreholes can be a key to understanding the subsurface hydraulic environment. Borehole flowmeters can measure both the direction and velocity of vertical flow along well bores, and these flows relate directly to aquifer parameters such as transmissivity, hydraulic conductivity, vertical head profiles, and the presence of fractures or permeable features along boreholes. Quantitative interpretation of borehole flow data can provide estimates of hydraulic parameters and be directly related to hydrostratigraphy.

This webinar will discuss the common types of flowmeters and associated equipment in use today, including both mechanical spinner and heat-pulse systems. Participants will learn the basic theory of operation, pros and cons of various systems, and appropriate application for flowmeter testing. The webinar will address tool calibration and appropriate field procedures for obtaining reliable data. The webinar will also demonstrate data interpretation and presentation methods.


  • Definition of borehole flowmeter testing
  • Considerations in flowmeter testing
  • The spinner flowmeter – collecting and interpreting data
    • Threshold velocities
    • Logging speeds
    • Problems and pitfalls
      • propeller
      • centralization
    • typical data
    • data processing and interpretation
  • The heat-pulse flowmeter –collecting and interpreting data
    • Appropriate flow velocities
    • Theory of operation
    • Determining flow direction
    • Typical data pulses
    • Problems and pitfalls
      • Too little flow
      • Too much flow
    • Data processing and interpretation
  • Applications of flowmeter data to hydraulic interpretation
    • Paillet methods
    • Halford methods
  • Case study in various bedrock types and conditions


  • Discover the advantages and applications of flow meters
  • Learn how to interpret a flow meter log
  • Learn how to determine vertical flows and gradients across an aquitard
  • Learn common mistakes and how to avoid them


  • Where is the change in rock mass permeability?
  • Is there a hydraulic head drop apparent in these results?
    If so, where is it and what other tools show a change? And if present, how is it related to the geology?
  • Where is the change in ambient borehole flow?
  • What column (tool) show insignificant relationship to this significant observation?

Instructors Bio

Kenneth Bradbury, PhD, PG
( )

Ken Bradbury received his PhD in Geology from the UW-Madison in 1982, and has been a research hydrogeologist/professor with the Wisconsin Geological and Natural History Survey, University of Wisconsin-Extension, since that time. He serves as Program Leader of water and environmental programs for the Survey.

Ken's applied research includes groundwater flow in fractured media, aquitard hydrogeology, groundwater recharge processes, wellhead protection, and the hydrogeology of glacial deposits.

Ken is the author of numerous scientific papers and reports, is a Fellow in the Geological Society of America, has chaired the National Research Council Committee on Water Resources Research for the U.S. Geological Survey, and is a former member of the National Research Council's Water Science and Technology Board. In 2007 Ken undertook six weeks of research and teaching in South Africa and Zimbabwe supported by the Fulbright Senior Specialist Program.

Dave Hart PhD, PG

Dave Hart is a hydrogeologist/geophysicist with the Wisconsin Geological and Natural History Survey and an associate professor at the University of Wisconsin-Extension.

Dave's applied research includes regional groundwater flow and recharge in southeastern Wisconsin, near-surface geophysics, and measurement of porosities and permeabilities in aquifers and aquitards. Prior to joining the university, he served as a hydrogeologist with Eder Associates. He is an associate editor for Ground Water and past president of the AWRA - Wisconsin Section.

Fee: 299.00 USD Per Webinar

Downloads: Session Slides (PDF)
Record of Attendance Form (PDF)

Number of Participants: Unlimited from a single computer (Broadcast webinar in your conference room or auditorium for no extra charge)

Continuing Education Certificates: Unlimited. $14.95 each. Official CEU certificates are available as an option and only available at the time of webinar participation from Northern Illinois University. Ordering steps are given at time of webinar order.

Access: On-demand, anytime 24/7.
Access Duration: 24 hours.

Discounts: Buy 3 on-demand webinars, and get 3 on-demand webinars for free!

Duration: 90 minutes
PDH Earned: 1.5 hours
Instructor(s): Ken Bradbury, Ph.D., PG, Program Leader and Hydrogeologist
David Hart, Ph.D., PG, Hydrogeologist

This On-Demand Webinar is NO LONGER available for purchase.

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