Rain falling from the sky does not come down as pure water. On the way down pollution particles in the air will latch themselves onto the raindrops thus bringing polluted water to the ground. In periods of heavy rain, it is absolutely essential to control stormwater runoff so that it does not enter any water systems that are used by humans. Also, ample stormwater runoff getting into waterways and such could prove to be disastrous for any aquatic wildlife.
There is no need to worry as there are plenty of techniques and tips you can gather to direct stormwater runoff properly into the sewer system. The internet is ideal for finding all that you need to know to go about controlling storm water on both large and small scales. Gather the equipment necessary for the job before the next rain so you are prepared when it happens.