Methods to convert American class A-pan and Symon's tank evaporation to that of a representative environments.

Methods were introduced to correct for significant evaporation differences which resulted from non-representative environmental evaporimeter installation practices. Inter-evaporimeter conversion formulae are presented to enable the extension of evaporation data bases. Guidelines are presented to assist in the choice of evaporation stations. Summer rainfall regions with an annual precipitation exceeding 500 mm and winter rainfall regions with an annual precipitation exceeding 240 mm were identified as areas with grass environment. Under the mentioned rainfall conditions it will be possible to maintain grass cover as an evaporation station environment without supplementary irrigation