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 South Nowlin

Primary Investigator: Doug Maurer

Well Data

USGS Site ID
Local Name Altitude Uppermost
Opening
Lowermost
Opening
Primary Aquifer Transmissivity
(ft2/d)
390118119451501 S. Nowlin 4694 60 330 ALLUVIAL FILL 2300

Aquifer Test

All Aquifer Test Files (zip)

South Nowlin

Aquifer Test (pdf)

Single-well step-drawdown and constant-rate tests of the well were conducted by Carson Pump of Carson City. 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 Douglas County, Community Development Department, Engineering Division (Carl Ruschmeyer, written commun., 2005). 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.

Rates for the step-drawdown test were varied from 250, 500, 750, and 1,100 GPM, measured with a totalizing meter, for periods of about 3 hours on 10/12/96. The pump rate for the constant-rate test varied from 950 to 800 GPM for a period of 24 hours from 10/13/96 to 10/14/96. The pump rate decreased from 950 to 800 GPM at 11AM on 10/13/96, causing a decrease in slope of the time-drawdown plot. For this reason, separate analyses of the data were made. The static water level prior to the constant-rate test was 3.7 ft lower than prior to the step-drawdown test, indicating the well had not completely recovered from the step-drawdown test on the previous day. The methods of water-level measurement, location of discharge of pumped water, and pre-test water-level trends are not known. Carson Pump reported the well had been idle for an extended period prior to testing, and the well was pumped for development for 3 hours on 10/10/96.

The analysis of the constant-rate pump test resulted in fairly similar estimates of hydraulic conductivity ranging from 7.3 to 8.4 ft/day, and transmissivity ranging from 2,000 to 2,600 ft2/day for time-drawdown plots of both the 800 and 950 GPM pump rates and the step-drawdown test. A well efficiency of over 100 percent was estimated using the 950 GPM data, suggesting results estimated from the 800 GPM data may be more reasonable.

 

 

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