Evapotranspiration is explicitly modeled for phreatophytes only. The maximum ET surface is set to be the ground surface and the extinction depth is set to 10 feet. In stream cells, the ET surface is 5 feet above the stream surface.

The ET area represents the area of phreatophytes estimated to exist towards the end of the simulation period. This area is adjusted within each sub-basin according to a set of sub-basin factors to account for basin to basin differences in phreatophytes as well as changes in phreatophyte areas over time. In particular, the basin factors represents the re-growth of phreatophytes after the 1935 flood and changes in flood behavior following the construction of reservoirs.

The maximum evapotranspiration rate is calculated as the product of the estimated area of phreatophytes appropriately adjusted for that stress period and the estimated evapotranspiration rate. This evapotranspiration rate is calculated using an equivalent crop at three stations across the basin and then linearly interpolated in an east-west direction to each cell.

Phreatophyte Areas
Phreatophyte Sub-Basins
Phreatophyte ET Sub-Basin Factors
Phreatophyte ET Monthly Maximum Rates
Home | Previous | Next

Data Files
Model Geometry
Aquifer Properties
Well Pumping
Predicted Heads
Baseflow Predictions
Water Budget
Model Predicted Impacts