Nevada Water Science Center


Aquifer Tests

Contact Information

Phil Gardner
Groundwater Specialist
Phone: (775) 887-7664
Email:pgardner@usgs.gov

 

Mailing Address
USGS
Nevada Water Science Center
2730 N. Deer Run Rd.
Carson City, NV 89701

 

Nevada Water Science Center
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Carson Valley Gardnerville 2

Primary Investigator: Doug Maurer

Well Data

USGS Site ID
Local Name Altitude Uppermost
Opening
Lowermost
Opening
Primary Aquifer Transmissivity
(ft2/d)
385646119451101 g-ville No. 2 4742 40 290 ALLUVIAL FILL 5000

Aquifer Test

All Aquifer Test Files (zip)

Gardnerville 2

Aquifer Test (pdf)

 

Single-well step-drawdown and constant rate tests of the well were conducted by Sargent Irrigation Company of Reno, Nevada. The well is completed in the basin-fill aquifer of Carson Valley, Nevada. Copies of time-drawdown and pump data were obtained from files of the Gardnerville Water Company (Mark Gonzales, written commun. 2005). Results of the aquifer tests will be used in the development of a numerical ground-water flow model in Carson Valley, project # 9705-BPS01. Specifically, the estimated transmissivity will be used to develop a relation between transmissivity and specific yield. The relation will then be used with data from driller's logs to develop a preliminary distribution of transmissivity for the valley.

The pump rate was varied from 625, to 760, and 800 GPM for about 2-hour periods during the step-drawdown test on 3/5/93 which ended at 5:30 PM. The constant-rate test was begun at 8AM the following day with a rate of 750 GPM for a 12-hour period. Static water level at the start of the constant-rate test was the same as at that at the start of the step-drawdown test indicating the well had fully recovered from the step-drawdown test. The methods of water-level and flow-rate measurements, location of discharge of pumped water, and pre-test water-level trends are not known. The well was reported completed on 8/12/47. Its use between the time of completion and aquifer testing is not known, but was likely in use for much of the 46-year period between completion and testing.

Results of the step-drawdown test indicate a hydraulic conductivity and transmissivity of 20 ft/day and 5,000 ft2/day, respectively, whereas results of the constant-rate test indicate a hydraulic conductivity and transmissivity of 18 ft/day and 5,000 ft2/day, respectively; fairly similar values.

 

 

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