Catching the Next Wave

A method of deducing some characteristics of an aquifer, such as transmissivity and storativity, differing from traditional pump drawdown testing, is outlined. The technique relied on the application of gas pressure to one well, after having first capped it, and installing pressure gauges in observa...

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Bibliographic Details
Published in:Water environment & technology 1994-01, Vol.6 (1), p.40-43
Main Authors: van Dyke, Nancy V.R., Rhodes, John A., Richardson, Donald W., McTigue, William H.
Format: Magazinearticle
Language:English
Subjects:
Aquifers
Earth sciences
Earth, ocean, space
Elastic waves
Exact sciences and technology
FOCUS
Hydraulic conductivity
Hydraulics
Hydrogeology
Hydrology. Hydrogeology
Loggers
Observation wells
Pneumatics
Pressure pulses
Transmissivity
Water pressure
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Summary:A method of deducing some characteristics of an aquifer, such as transmissivity and storativity, differing from traditional pump drawdown testing, is outlined. The technique relied on the application of gas pressure to one well, after having first capped it, and installing pressure gauges in observation wells to monitor the effects of the pressure pulses through strata of different porosities. For reasons of economy, existing (normally pumping) wells in a well-field should be used as the observation wells. In the method outlined, the pulse times were normally about 5 minutes. The differences recorded by the pressure gauges were related to the time of their appearance in the observation wells, and to the distance of these from the pulsed well. In a New Jersey case study the pressurizing gas was nitrogen. The data received from the pressure gauges were recorded on a data logger, and subsequently down-loaded onto a computer for analysis.
ISSN:1044-9493
1938-193X