A quantitative and qualitative investigation of ball and foam covers coated with cement slurry and their composition on reducing evaporation and choosing the best coating by the AHP method

Abstract The present study sought to use a 20 mm thick foam coated with cement slurry and blue ball diameter of 6 cm, as physical methods, in 50 80% surface covers, their composite coverage the Colorado pan. water depth pans was measured for 1 month autumn season. Then, pans' daily evaporation calculated compared amount control evaporation. results indicated that combined method (plastic foam) reduced by about 68%, plastic (B80%) cover 58%, coating 53%, 50% 34%, finally (F50%) 28%. Concerning statistical analysis this research, significant correlation observed between pan average temperature, although there no fixed uniform relationship maximum wind speed, air pressure, relative humidity, number sunshine hours. In 50%, 80%, had better performance terms best quality based on electrical conductivity, respectively.