Just one inch of rainfall on a 1000-square-foot roof can add 600 gallons that it has to collect and divert through its gutters and downspouts. To do its job, your gutter installation needs to have downspouts that are adequately spaced. Otherwise, water will infiltrate your basement, which can, in turn, cause several moisture issues such as mold.
Here are some of the guidelines for the placement of the downspouts: