Scientific Investigations Report 2006-5252
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006-5252
Table 7. Average monthly evaporation and computed monthly evaporative loss from Lake Mead, Arizona and Nevada, July 1997–December 1999.
[Evaporation rate, in inches, are average rates for available open-water sites (table 6). Volume of water was computed by multiplying average open-water evaporation rates, converted to feet, by lake-surface area, in acres. Lake-surface area derived from area-capacity tables and mean daily elevation. For October 1997, monthly evaporation at Water Barge Cove was used. Symbol: –, data not computed]
| Jan. | Feb. | Mar. | Apr. | May | June | July | Aug. | Sept. | Oct. | Nov. | Dec. | Annual | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Evaporation, in inches | |||||||||||||
| 1997 | – | – | – | – | – | – | 9.1 | 9.1 | 8.8 | 8.7 | 6.4 | 4.6 | – |
| 1998 | 3.7 | 3.6 | 7.1 | 8.0 | 9.8 | 9.2 | 9.9 | 8.8 | 9.3 | 7.8 | 6.6 | 5.0 | 88.9 |
| 1999 | 4.5 | 4.8 | 8.0 | 7.0 | 9.4 | 9.4 | 8.9 | 8.6 | 9.5 | 8.5 | 7.0 | 5.3 | 90.7 |
| Average | 4.1 | 4.2 | 7.5 | 7.6 | 9.6 | 9.3 | 9.3 | 8.8 | 9.2 | 8.3 | 6.7 | 5.0 | 189.8 |
| Evaporation, in acre-feet | |||||||||||||
| 1997 | – | – | – | – | – | – | 112,000 | 112,000 | 108,000 | 109,000 | 81,000 | 59,000 | – |
| 1998 | 48,000 | 46,000 | 91,000 | 102,000 | 125,000 | 117,000 | 126,000 | 113,000 | 119,000 | 101,000 | 85,000 | 64,000 | 1,137,000 |
| 1999 | 57,000 | 61,000 | 101,000 | 88,000 | 117,000 | 116,000 | 110,000 | 108,000 | 120,000 | 108,000 | 89,000 | 67,000 | 1,142,000 |
1Average annual evaporation rate is only for 1998–99.
U.S.
Department of the Interior | U.S. Geological
Survey
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