Water-Resources Investigations Report 01-4234
Estimates of Evapotranspiration from the Ruby Lake National Wildlife Refuge Area, Ruby Valley, Northeastern Nevada, May 1999-October 2000
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Table 4. Area and estimated annual evapotranspiration for major habitats within Ruby Lake National Wildlife Refuge, September 1999-October 2000, northeastern Nevada |
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Habitat |
Area (acres)1 |
Evapotranspiration (feet)2 |
Evapotranspiration (acre-feet per year)3 |
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Winter |
Summer |
Winter |
Summer |
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Open water |
5,700 |
3,700 |
1.99 |
3.32 |
23,600 |
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Bulrush marsh |
8,100 |
5,600 |
1.10 |
3.09 |
26,200 |
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Meadow |
4,100 |
4,100 |
1.08 |
2.11 |
13,100 |
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Grassland |
3,100 |
3,100 |
.87 |
1.49 |
7,320 |
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Mixed phreatophytes |
5,500 |
5,500 |
.50 |
.83 |
7,320 |
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Desert-shrub upland |
4,800 |
4,800 |
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.51 |
.48 |
4,750 |
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Playa and bare soil |
6,300 |
10,800 |
.46 |
.34 |
6,570 |
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Total |
37,600 |
37,600 |
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89,000 |
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1 Area in winter (October 1999-April 2000) determined in March 2000 during maximum extent of wetland; area in summer (May 2000-September 2000) determined in September 2000 during minimum area of wetland.
2 See table 2 for seasonal ET rates for open water, bulrush marsh, mixed phreatophytes, and desert-shrub upland. Annual ET rates for other habitats equal sum of seasonal precipitation (winter, 0.42 ft; summer, 0.23 ft) measured at Ruby Lake NWR and annual ground-water ET rate of 2.54 ft/yr for meadow; 1.71 ft/yr for grassland; and 0.15 ft/yr for area of playa and bare soil determined from Landsat data (Nichols, 2000) and proportioned seasonally based on 26 percent of annual ET occurring during winter and 74 percent occurring during summer (Nichols, 2000, p. C12).
3 Computed as sum of products of estimated seasonal habitat area and seasonal evapotranspiration.
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