Downspouts / Leaders
A downspout or leader is used to carry water from the gutter down to ground level, often directing the water to or towards a nearby sewer system. The water is directed away from the foundation of the building. Not only does this protect the foundation from costly water damage, it prevents water from accumulating in the soil, severely reducing the chances of problems with the structure or basement moisture problems.
Downspouts are usually rectangular in shape, and made of the same material as the gutters. They are usually two to three inches for a five-inch K-style gutter, however three to four inches is the preferred length, as they are better resist clogging and cleaning them is easier. It is important that downspouts are installed properly and routinely checked, to ensure the drain is free of debris and that the connection is tight.