Rain is of greatly importance to us. Without rain, our water supply would cut off and we would die, such would plants and animals. Therefore, too much rain does a lot of harms to us. It floods fields, towns and cities, cause great losses for us. So far, man's control over rain had never stopped. If we can gain more effective control over rain, we will enjoy more freedom from the nature. Luckily, we humans have taken steps, such as planting more trees or using weather forecasts, to help avoiding flood damage and protect our water supply.