Summary

Description

Synthetic evaporation data are used to supplement observed Class A pan evaporation data. Synthetic data are required owing to the limited availability of observed data, particularly in the years prior to 1970. Multiple regression was used to construct a model for estimating evaporation from a linear combination of solar radiation and vapour pressure deficit. The model was fitted using observational records from 1975-2003 which had been analysed to eliminate suspect data.