Nevada Water Science Center

Aquifer Tests

Contact Information

Phil Gardner
Groundwater Specialist
Phone: (775) 887-7664


Mailing Address
Nevada Water Science Center
2730 N. Deer Run Rd.
Carson City, NV 89701


Nevada Water Science Center

Home Page Surface Water Groundwater Water Quality Research Contact Us



Carson Valley North Clapham

Primary Investigator: Doug Maurer

Well Data

Local Name Altitude Uppermost
Primary Aquifer Transmissivity
390219119440001 N Clapham 4727 55 220 ALLUVIAL FILL 2250


Aquifer Test

All Aquifer Test Files (zip)

North Clapham

Aquifer Test (pdf)

Single-well step-drawdown and constant-rate tests of the well were conducted by Carson Pump of Carson City. The wellis 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 150, to 300, and 450 GPM, measured with a totalizing meter, for periods of about 3 hours on 9/10/96. The pump rate for the constant-rate test was 375 GPM for a period of 24 hours from 9/11/96 to 9/12/96. The static water level prior to the constant-rate test was 1.5 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 and pre-test water-level trends are not known. Pumped water was discharged through a 400 ft hose to a nearby ditch. Carson Pump noted entrained air in the discharge, indicating the upper portions of the well screen were exposed during testing. 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.

The analysis of the step-drawdown test resulted in estimates of hydraulic conductivity and transmissivity, respectively, of 13 ft/day and 3,500 ft2/day. The analysis of the constant-rate test resulted in estimates of hydraulic conductivity and transmissivity, respectively, of 5 ft/day and 1,000 ft2/day. It is uncertain which value may be more reasonable.



Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: Nevada Water Science Center Web Team
Page Last Modified: October 5, 2009 -->