Scientific Investigations Report 2006–5305

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

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Table 13. Estimated ground-water inflow from the Pine Nut Mountains and eastern alluvial fans using the chloride-balance method, Carson Valley, Nevada and California.

[Annual precipitation on perennial stream drainages and eastern alluvial fans from linear relations and adjusted PRISM: From table 5. Estimated ground-water inflow using linear precipitation distribution and adjusted PRISM precipitation distribution: Estimated using equation 1, R = (Cp PCr R)/Cg (Wilson and Guan, 2004, p. 122). ET rate from linear relation and adjusted PRISM distributions: Determined from volume of total precipitation minus estimated recharge, divided by total area of Pine Nut Mountains and eastern alluvial fans, 135,800 acres. Shaded cells indicate chloride concentration varied from average values]

Annual precipitation on perennial and ephemeral stream drainages and eastern Quaternary alluvial fans, in acre-feet   Chloride concentration(milligrams per liter) Estimated ground-water inflow using linear precipitation distribution (rounded, acre-feet per year) ET rate from linear relation distribution(feet per year) Estimated ground-water inflow using adjusted PRISM precipitation distribution (rounded, acre-feet per year) ET rate from adjusted PRISM distribution (feet per year)
Linear relations Adjusted PRISM Precipitation Ground water
131,000 132,000   10.5 25.9 11,000 0.9 11,000 0.9
30.3 5.9 6,700 0.9 6,700 0.9
30.6 5.9 13,000 0.9 13,000 0.9
0.5 44.5 15,000 0.9 15,000 0.9
0.5 57.3 9,000 0.9 9,000 0.9

1 From Feth and others (1964, p. 35).

2 Average of 89 samples from 21 wells on eastern side of Carson Valley, 1983–2006.

3 Range of uncertainty in chloride concentration of precipitation determined by Maurer and others (2006, p. 32).

4 Average concentration of ground water, –1 standard deviation, 1.4 mg/L.

5 Average concentration of ground water, +1 standard deviation, 1.4 mg/L.

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