In these project is deals with control evaporation losses from open surfaces using floating balls. The project is done by preparing two models and by using conventional method. These project is executed in Aurangabad and the models were kept at height of 15m from ground level which are directly in contact with sun radiation. We prepared the Model A which is a pan with open surface and Model B which is a pan whose surface is covered with floating balls. Pan /Tray is taken of dimensions 0.42m length, 0.31m breadth and surface area is taken as 0.1302 m2, then provided with initial water level of 9.7cm (at maximum temperature 43°C and minimum tempe rature 23°C). The model A is kept open surface and model B is kept covered with floating balls. Daily readings of evaporation in Model A and Model B were taken in pre-monsoon and monsoon season. After the study, we find that proposed models is successful for evaporation losses from open surface by 49%.

Keywords : Control of Evaporation, Floating Balls.