Scientific Investigations Report 2006–5305
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5305
Table 19. Evapotranspiration for selected vegetation and land-use types, Carson Valley, Nevada and California, 2005 and 1979.
[Area in 2005: Estimated from imagery collected in 2004 and updated from field check in 2005 (fig. 8). Area in 1979: Estimated from aerial color infrared photography taken in 1979. – indicates non-irrigated pasture grasses not determined in 1979]
| Vegetation/Land-use type | Area in 2005 (acres) |
Estimated ET rate (feet per year) |
Estimated ET volume in 2005 (acre-feet per year) |
Area in 1979 (acres) |
Estimated ET volume in 1979 (acre-feet per year) |
|---|---|---|---|---|---|
| Native phreatophytes (rabbitbrush and greasewood) | 5,440 | 11.9 | 10,000 | 28,100 | 15,000 |
| Irrigated pasture grasses | 27,500 | 13.0 | 83,000 | 340,000 | 120,000 |
| Irrigated alfalfa | 11,500 | 13.0 | 34,000 | ||
| Non-irrigated pasture grasses | 41,400 | 11.7 | 2,400 | – | – |
| Wetlands | 5760 | 14.4 | 3,300 | 500 | 2,200 |
| Open water | 61,700 | 75.0 | 8,500 | 1,700 | 8,500 |
| Riparian vegetation (cottonwood and willow) | 81,420 | 93.5 | 5,000 | 1,420 | 5,000 |
| Total, rounded | 49,700 | 146,000 | 52,000 | 151,000 |
1 From Maurer and others (2006, p. 22).
2 Includes 2,650 acres removed for agricultural, residential, and commercial use in 2005.
3 Areas of irrigated pasture grasses and alfalfa combined, includes 2,200 acres removed for residential or commercial use in 2005 less 2,100 acres irrigated in 2005 that were not irrigated in 1979, and 900 acres of non-irrigated pasture grasses in 2005 that were irrigated in 1979.
4 Includes 500 acres that were rabbitbrush and greasewood in 1979 and were non-irrigated pasture in 2005.
5 Includes 250 acres of wetlands used for effluent discharge not present in 1979.
6 Assumed to represent an annual average and to be similar in 1979 and 2005.
7 From Huntington (2003, p. 55).
8 Assumed to be similar in 1979 and 2005.
9 From U.S. Geological Survey (2005), station 390653118583901.
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