Scientific Investigations Report 2006–5305

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5305

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Table 22. Annual ground-water budget for basin-fill aquifer, Carson Valley, Nevada and California, water years 1990–2005.

[Abbreviations: acre-ft/yr, acre-feet per year; ft/d, feet per day; ft2, square feet]

Source of recharge and discharge Estimated
average volume
(acre-ft/yr)		 Estimated low-
and high-range
volume
(acre-ft/yr)
Ground-water recharge
Ground-water inflow1 and recharge from precipitation on Quaternary eolian sand and gravel deposits2 22,000 – 40,000 15,000 – 58,000
Ground-water recharge from streamflow3 10,000 10,000
Secondary recharge of pumped ground water 4 3,000 – 6,000 3,000 – 6,000
Total 35,000 – 56,000 28,000 – 74,000
Ground-water discharge
Ground-water ET from phreatophytic and riparian vegetation and non-irrigated pasture grasses5 11,000
Ground-water discharge to streamflow6 15,000
Net ground-water pumping4 15,000 – 18,000
Total 41,000 – 44,000

1 From table 15.

2 From table 6.

3 Estimated from annual streamflow loss during summer months for water years 1990–2005, determined from the difference between mean daily inflow to and outflow from Carson Valley during summer months; 89,000  acre-ft/yr, minus the combined ET loss from streamflow and ground water, 79,000  acre-ft/yr (table 20). The volume of 10,000 acre-ft/yr represents a minimum value assuming minor ground-water contribution to ET.

4 From table 18.

5 From table 20.

6 Estimated as the average of streamflow gain during winter months for water years 1990–2005 determined from difference between mean daily inflow to and outflow from Carson Valley; 16,000 acre-ft/yr, and streamflow gain estimated from application of a gain rate of 0.3 ft/day (Maurer and others, 2006, p. 43) to the area of the West Fork and Carson River north of Muller Lane to the study area boundary, 5,65 million ft2; 14,000 acre-ft/yr.

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