Introduction
Evaporation generally measured in mm/day is a globally studied phenomena starting from early 1900’s.
Ambient air temperature, relative humidity in air, water temperature & wind speed are the main factors which governs evaporation rates.
Experiments have been carried out in oceans, lakes, rivers, swimming pools and other water bodies to study evaporation at larger scales.
Penmann [1] came up with an empirical correlation for evaporation rate
in presence of a wind.
There have been a few studies (Sharpley & Boelter [2], Boelter et al [3]) when there is no wind i.e. when evaporation occurs in a natural convection environment measured evaporation from a pan of water in natural convection environment.