Scientific Investigations Report 2006–5305
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5305
Table 12. Estimated ground-water inflow from the Carson Range and western alluvial fans using the chloride-balance method, Carson Valley, Nevada and California.
[Annual runoff from perennial stream drainages: Includes sites 2-11, 14, and 15, table 9. Annual precipitation: From table 5. Estimated ground-water inflow: Estimated using equation 1, R = (Cp P – Cr R)/Cg (Wilson and Guan, 2004, p. 122). ET rate: Determined from volume of total precipitation minus runoff and estimated ground-water inflow, divided by total area of Carson Range and western alluvial fans, 94,200 acres. Shaded cells indicate chloride concentration varied from average values]
| Annual runoff from perennial stream drainages (acre-feet) |
Annual precipitation, in acre-feet | Chloride concentration (milligrams per liter) |
Estimated ground-water inflow (rounded, acre-feet per year) | ET rate (feet per year) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| On perennial stream drainages (acre-feet) |
On ephemeral stream drainages (acre-feet) |
On western alluvial fans (acre-feet) |
Total | Precipitation | Runoff | Ground water | ||||
| 10.5 | 20.9 | 31.1 | 27,000 | 1.0 | ||||||
| 40.3 | 0.9 | 1.1 | 9,600 | 1.4 | ||||||
| 40.6 | 0.9 | 1.1 | 35,000 | 0.9 | ||||||
| 19,700 | 52,500 | 27,400 | 14,300 | 94,200 | 0.5 | 50.3 | 1.1 | 37,000 | 0.8 | |
| 0.5 | 61.5 | 1.1 | 16,000 | 1.3 | ||||||
| 0.5 | 0.9 | 70.4 | 73,000 | 0.02 | ||||||
| 0.5 | 0.9 | 81.8 | 16,000 | 1.3 | ||||||
1 From Feth and others (1964, p. 35), average of 79 snow samples from the Sierra Nevada.
2 Average of 85 samples from West Fork Carson River, 1960–94.
3 Average of samples from 23 wells along toe of western alluvial fans, 1976–2004.
4 Range of uncertainty in chloride concentration of precipitation determined by Maurer and others (2006, p. 32).
5 Average concentration of runoff –1 standard deviation, 0.6 mg/L.
6 Average concentration of runoff +1 standard deviation, 0.6 mg/L.
7 Average concentration of ground water –1 standard deviation, 0.7 mg/L.
8 Average concentration of ground water +1 standard deviation, 0.7 mg/L.
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Department of the Interior | U.S. Geological
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