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

Primary Investigator: Doug Maurer

Well Data

USGS Site ID
Local Name Altitude Uppermost
Opening
Lowermost
Opening
Primary Aquifer Transmissivity
(ft2/d)
385738119433601 Minden#8 4800 110 510 ALLUVIAL FILL 23000

 

Aquifer Test

All Aquifer Test Files (zip)

Minden 8

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 Resource Concepts, Inc.(RCI), the engineering firm in charge of the water-supply system for the town of Minden (Bruce Scott, RCI, 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 900, to 1,200, and 1,800 GPM for about 1-hour periods during the step-drawndown test on 11/17/94 which ended at 12 PM. The constant-rate test was begun 4 hours later with a rate of 1,800 GPM from 1:05 PM to at least 5 AM the following day, and a rate of 1,750 GPM for the remainder of the 48-hour test ending at 5AM on 11/19/94. Static water level was about 4 ft lower at the start of the constant-rate test than at the start of the step test, indicating the well had not recovered completely 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 10/12/88. It’s use between the time of completion and aquifer testing is not known.

Results of the step-drawdown test indicate a hydraulic conductivity and transmissivity of 40 ft/day and 20,000 ft2/day, respectively, whereas results of the constant-rate test indicate a hydraulic conductivity and transmissivity of 56 ft/day and 26,000 ft2/day, respectively. It is uncertain which values are more reasonable.

 

 

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