Scale effect of hydraulic conductivity measurements in Pre-Illinoian and Wisconsinan tills in Iowa

Conference · Mon Mar 01 04:00:00 EST 1993 · Geological Society of America, Abstracts with Programs; (United States)

OSTI ID:5074764

Bruner, D R ^[1]

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1. Iowa Dept. of Natural Resources, Iowa City, IA (United States). Geological Survey Bureau

Two long-term study sites have been established as the basis for a multi-year study of the hydrogeologic properties of glacial tills in Iowa. One is located in Eastern Iowa in Pre-Illinoian till and has had laboratory permeameter tests conducted on Shelby tube samples, collected during construction of piezometers, from the zone to be screen. These piezometers were used to run bailer tests and perform a pumping test. The other site is located in North-Central Iowa in Wisconsinan till and has piezometers constructed to run bailer and pumping tests. Results from both sites has shown that the bulk hydraulic conductivity increases as larger volumes of till are tested. There is consistently at least one order of magnitude increase between bailer and pumping test results. There is also at least three orders of magnitude increase between laboratory permeameter and pumping test results. A system is proposed to conduct pumping tests using vibrating wire transducers hydraulically pushed into the ground to monitor water levels before, during and after the test, and record the measurements to a datalogger.

• OSTI ID: 5074764
• Report Number(s): CONF-9303210--
• Conference Information: Journal Name: Geological Society of America, Abstracts with Programs; (United States) Journal Volume: 25:3
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540210 -- Environment
Terrestrial-- Basic Studies-- (1990-)
58 GEOSCIENCES
580000* -- Geosciences
DEVELOPED COUNTRIES
GEOLOGIC DEPOSITS
GROUND WATER
HYDRAULIC CONDUCTIVITY
HYDROGEN COMPOUNDS
HYDROLOGY
IOWA
MORAINES
NORTH AMERICA
OXYGEN COMPOUNDS
USA
WATER