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 Ranchos 8

Primary Investigator: Doug Maurer

Well Data

USGS Site ID
Local Name Altitude Uppermost
Opening
Lowermost
Opening
Primary Aquifer Transmissivity
(ft2/d)
385505119435901 Ranchos 8 4795 260 500 ALLUVIAL FILL 23000

 

Aquifer Test

All Aquifer Test Files (zip)

Ranchos 8

Aquifer Test (pdf)

Single-well step-drawdown and constant rate tests of the well were conducted likely by Humboldt Drilling of Winnemucca, Nevada, although not explicitly named on the test-data sheets. 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 (Bob Spellburg, 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 1,000, to 1,200, to 1,500, and 1,800 GPM for 2-hour periods during the step-drawndown test on 8/14/97 which ended at 4 PM. The constant-rate test was done the following day (8/15/97) beginning at 8 AM with a pump rate of 1,200 GPM for a period of 23 hours. 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 8/8/97, and development of the well likely took place a relatively short time prior to the test periods.

Results of the step-drawdown analysis indicate a hydraulic conductivity and transmissivity of 3.0 ft/day and 1,000 ft2/day, respectively, whereas the constant-rate analysis indicates a hydraulic conductivity and transmissivity of 2.8 ft/day and 1,300 ft2/day, respectively; fairly similar results.

 

 

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