The use of the Piche evaporimeter in the calculation of evaporation

Abstract

Abstract Water loss measured by the Piche evaporimeter, E , was found to be highly correlated with the calculated aerodynamic term, Ea , in Penman's evaporation formula. The error introduced by using the more convenient Piche evaporimeter measurements was less than that caused by the use of a single daily observation of vapour pressure in the calculation of the aerodynamic term. No significant difference was found between the relationship in the Judean hills and the arid Negev region of Israel which was A test of a simplified form of Penman's formula, based on local Piche evaporimeter readings for the aerodynamic term and a regional value for the energy term, gave close agreement with the evaporation values calculated using the full formula.