Pump test analyses for low yielding aquifers
Assessment of the effects of coal mining on groundwater systems requires that pump tests be performed on the aquifers that will be impacted. In the arid regions of the West, many of the water bearing strata have extremely low transmissivities making standard single or multiple well time drawdown and recovery test analyses difficult if not impossible. Data analysis is further complicated by the effects of well efficiency and casing storage. Pump test analysis techniques for low yield formations have been proposed by Schafer and McWhorter. Schafer's method employs a semi-logarithmic plot of well recovery expressed in terms of s/Q versus t. McWhorter's method employs two data analysis techniques which incorporate aquifer afterflow in their solutions. One technique involves a semi-logarithmic plot of well recovery defined as the ratio of partial recovery to total drawdown versus t. The other technique involves a mathematical solution which incorporates a series of time steps to account for portions of aquifer afterflow during the recovery portion of the pump test. A final technique has been developed and utilized by Peabody Coal Company's Arizona Division. This technique is a modification of the slug test as described by Cooper et al. This technique employs a rapid withdrawal of water from the well bore over a large portion of the saturated interval. The solution utilizes semi-logarithmic plots of H/H/sub 0/ versus t.
- Research Organization:
- Peabody Coal Co., Flagstaff, AZ
- OSTI ID:
- 5461795
- Report Number(s):
- CONF-821175-
- Journal Information:
- Univ. Ky., Off. Eng. Serv., (Bull.); (United States), Conference: Symposium on surface mining hydrology, sedimentology, and reclamation, Lexington, KY, USA, 1 Nov 1982
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
AQUIFERS
DRAWDOWN
COAL MINING
ENVIRONMENTAL IMPACTS
GROUND WATER
RESEARCH PROGRAMS
WATER POLLUTION
DATA ANALYSIS
MATHEMATICAL MODELS
PUMPING
RECHARGE
HYDROGEN COMPOUNDS
MINING
OXYGEN COMPOUNDS
POLLUTION
WATER
010900* - Coal
Lignite
& Peat- Environmental Aspects
520100 - Environment
Aquatic- Basic Studies- (-1989)