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 Clapham

Primary Investigator: Doug Maurer

Well Data

USGS Site ID
Local Name Altitude Uppermost
Opening
Lowermost
Opening
Primary Aquifer Transmissivity
(ft2/d)
390206119440001 S. Clapham 4727 55 220 ALLUVIAL FILL 1900

 

Aquifer Test

All Aquifer Test Files (zip)

South Clapham

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 lcompleted 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 150, to 300, and 450 GPM, measured with a totalizing meter, for periods of about 3 hours on 9/16/96. The pump rate for the constant-rate test was 200 GPM for a period of 6 hours on 9/20/96. The static water level prior to the constant-rate test was 0.1 ft greater than that prior to the step-drawdown test, indicating the well had completely recovered from the step-drawdown test four days prior, and little effects of long-term water-level changes. The method of water-level measurement is not known. The discharge of pumped water was through a 200 ft hose to a nearby ditch. The well was reported completed on sometime in 1978, and it is assumed the well was in use during the 18-year period prior to testing. Carson Pump reported entrained air in the discharge, indicating the upper perforations of the well screen were exposed during testing.

The analysis of the step-drawdown test resulted in estimates of hydraulic conductivity and transmissivity, respectively, of 7 ft/day and 2,000 ft2/day. The analysis of the constant-rate test resulted in estimates of hydraulic conductivity and transmissivity, respectively, of 5 ft/day and 1,800 ft2/day. It is uncertain which value may be more reasonable.

 

 

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