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
Information

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Carson Valley Ranchos 2a

Primary Investigator: Doug Maurer

Well Data

USGS Site ID
Local Name Altitude Uppermost
Opening
Lowermost
Opening
Primary Aquifer Transmissivity
(ft2/d)
385445119440001 Ranchos 2a 4821 270 670 ALLUVIAL FILL 3300

 

Aquifer Test

All Aquifer Test Files (zip)

Ranchos 2A

Aquifer Test (pdf)

A single-well constant-rate test was conducted by Lumos Associates, Inc. of Carson City, Nevada. . The well is completed in the basin-fill aquifer of Carson Valley, Nevada. Copies of the time-drawdown and pump data were obtained from files of the Gardnerville Ranchos General Improvement District .Results of the aquifer test 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 during the test was 1,800 GPM, measured with a totalizing meter, for a period of 48 hours from 4/28/04 to 4/30/04. Adjustments in pump rates were made at numerous times during the test likely causing departures from a straight-line time-drawdown plot. The method of water-level measurements, location of discharge of pumped water, and pre-test water-level trends are not known. The well was reported completed on 4/26/04, and development of the well likely took place a relatively short time prior to the test period. Time-drawdown data were analyzed using an Excel spreadsheet program and the Cooper-Jacob analysis.

Results of the test indicate a hydraulic conductivity and transmissivity of 5.1 ft/day and 3,300 ft2/day, respectively.

 

 

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