Difference between revisions of "Evapotranspiration"
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<math>PET_{uncorrected}=1.6\cdot \left ( \frac{10\cdot T}{I} \right )^{\alpha }</math> | <math>PET_{uncorrected}=1.6\cdot \left ( \frac{10\cdot T}{I} \right )^{\alpha }</math> | ||
where: α = 6.75 x 10<sup>-7</sup>''I<sup>3</sup>'' - 7.71 x 10<sup>-5</sup>''I<sup>2</sup>''+ 0.0179''I'' + 0.49 | where: α = 6.75 x 10<sup>-7</sup> ''I<sup>3</sup>'' - 7.71 x 10<sup>-5</sup> ''I<sup>2</sup>''+ 0.0179 ''I'' + 0.49 | ||
Revision as of 16:22, 8 January 2018
Thornthwaite Mather method[edit]
Step 1. Calculate the monthly heat index (i): where: T = mean monthly temperature.
Step 2. Calculate the annual heat index (I):
Step 3. Calculate an uncorrected Potential Evapotranspiration (PETuncorrected):
where: α = 6.75 x 10-7 I3 - 7.71 x 10-5 I2+ 0.0179 I + 0.49