(HP-67) Evapotranspiration & Evaporation

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An extract from Programs REVAP and WEVAP for Estimating Areal Evapotranspiration and Lake Evaporation from Climatological Observations, National Hydrology Research Institute, Inland Waters Directorate, NHRI Paper No. 12, OTTAWA CANADA, 1980, 56 pgs.

"Abstract
This report contains the necessary documentation for application of the computer programs REVAP and WEVAP. Estimates of areal evapotranspiration or lake evaporation for periods of 5 days to 1 month are made from routinely published records of air temperature, dew point temperature and sunshine duration. Both models are based on a complementary relationship between areal and potential evapotranspiration.
… Included in the appendices are … program listing … and documentation of the comparable Hewlett-Packard HP-67 hand-held calculator program.
…
Contents
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APPENDIX III. Areal evapotranspiration and lake evaporation models for Hewlett-Packard HP-67 hand-held calculator … pgs. 43-56"

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