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Thanks. Plenty of ag here, so I can at least get an idea.http://www.usda.gov/oce/weather/pubs/Weekly/Wwcb/
Click on Bulletin. When the PDF loads scroll to Pan Evaporation. This is only available during the growing season but it will give you an idea what the evaporation range for your area is. The evap rates are not available for all areas, only those that have agricultural lands.
This is also a good guideline for evap rates-
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