I am doing a study where estimates of evaporation are needed for an open water reservoir location that is 11km away from the nearest Meteorological Observatory. Is it possible to use Penman or any other equation to obtain reliable estimates of evaporation from the Reservoir? If not, is there any software that I can use to get simulated values for the site using the Meteorological Data that I can obtain from the Observatory so that I can then use the results to calculate the evaporation?