Scientific Investigations Report 2006–5043
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5043
Table 4. Description of Lower Colorado River Accounting System phreatophyte groups.
[Group names and descriptions are from Lower Colorado River Accounting System (LCRAS; U.S. Bureau of Reclamation, 2004). Acreages based on 1994 LCRAS geographic data and are for Davis Dam to Parker Dam subreach of Colorado River]
| Group name | Description | Area (acres) | Annual evapotranspiration, 2003 (feet) |
|---|---|---|---|
| barren | Less than 10 percent vegetation | 13,326 | 1.01 |
| sc_low | 11 to 60 percent saltcedar and less than or equal to 25 percent arrowweed | 12,710 | 4.50 |
| sc_high | 61 to 100 percent saltcedar and less than or equal to 25 percent arrowweed | 8,057 | 5.11 |
| sc/ms | 11 to 60 percent saltcedar, 11 to 60 percent mesquite, and less than or equal to 25 percent arrowweed | 3,922 | 5.40 |
| ms_low | 11 to 60 percent screwbean and honey mesquite and less than or equal to 25 percent arrowweed | 900 | 3.98 |
| sc_aw | Less than or equal to 75 percent saltcedar and greater than or equal to 25 percent arrowweed | 594 | 5.24 |
| sc/ms/aw | 15 to 45 percent saltcedar, 15 to 45 percent mesquite, and 20 to 40 percent arrowweed | 643 | 5.48 |
| ms_high | 61 to 100 percent screwbean and honey mesquite, and less than or equal to 25 percent arrowweed | 892 | 4.96 |
| ms/aw | 21 to 60 percent mesquite, 31 to 60 percent arrowweed, and less than or equal to 20 percent saltcedar | 1,178 | 4.74 |
| aw | 51 to 100 percent arrowweed and less than or equal to 10 percent any trees | 1,516 | 4.66 |
| low_veg | Greater than 10 percent and less than or equal to 30 percent any phreatophyte vegetation | 2,419 | 4.26 |
| cw | 61 to 100 percent cottonwood and willow trees | 452 | 4.91 |
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