- Higher wind velocity also had an impact over the evaporation reduction in Shade balls as when the wind velocity was higher the evaporation reduced rate subsided.- The quality of water remains unchanged in shade ball when compared to other methods.- The quality of water gets degraded in Biological method –Duck Weed.- Duck Weeds makes the water less usable for secondary applications such as recreational activities such as fishing, navigation, electricity production, swimming etc.- From the graphs plotted for Normal evaporation vs Duck Weed, it is inferred that the water level in pan reduced to greater depth more than the normal evaporation which may be due to intake of water by the duck weed.- The different evaporation reduction rates are as follows.