FLASH – A PROGRAM FOR FLOW-LOG ANALYSIS OF SINGLE HOLES

JOHNSON, Carole D., U.S. Geological Survey, Water Resources Division, Branch of Geophysics, Office of Ground Water, 11 Sherman Place, Unit 5015, Storrs, CT 06269, DAY-LEWIS, Frederick D., Office of Groundwater, Branch of Geophysics, U.S. Geological Survey, 11 Sherman Place, Unit 5015, Storrs, CT 06269, Storrs-Mansfield, CT 06269, PAILLET, Frederick L., (Emeritus) Office of Groundwater, Branch of Geophysics, U.S. Geological Survey, 11 Sherman Place, Unit 5015, Storrs, CT 06269, Storrs-Mansfield, CT 06269, HALFORD, Keith J., US Geological Survey, 2730 N. Deer Run Rd, Carson City, NV 89701 and WILLIAMS, John H., U. S. Geological Survey, 425 Jordan Road, Troy, NY 12180, cjohnson@usgs.gov

Historically, borehole-flow logs have been used to delineate flow zones under ambient conditions or to determine zone contributions under stressed conditions. More recently, flow logs have been analyzed to estimate flow-zone transmissivity and far-field heads. This type of quantitative analysis requires collection of logs and water levels under both ambient and stressed conditions and use of an analytical or numerical model.

The USGS computer program, FLASH (Flow Log Analysis for Single Holes), provides an easy-to-use utility for the quantitative analysis of flow logs collected in single boreholes. The code is based on a multi-layer, analytical solution for steady-state radial flow to a single borehole. FLASH provides a simple graphical user interface (GUI) for calibration of an analytical borehole-flow model and for estimation of flow-zone transmissivities and far-field heads. Flow zones can be discrete fractures, fracture zones, or aquifer layers. FLASH is embedded within a Microsoft Excel spreadsheet and uses Visual Basic for Applications (VBA) routines to invoke the Excel solver for automated parameter estimation.

Session No. 273

Hydrogeology I: Physical Hydrogeology

Wednesday, 3 November 2010: 1:30 PM-5:30 PM

Room 402 (Colorado Convention Center)

Geological Society of America Abstracts with Programs. Vol. 42, No. 5, p.639

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