Downspout runoff can cause flooding around the foundation of your house and lead to foundation damage and wood rot. These common problems can be prevented and fixed with a NDS catch basin set under the downspout to catch the water and divert it away from the foundation of your home. Check it out here! http://www.ndspro.com/drainage-systems/catch-basins-and-grates/catch-basins-and-grates-category-overview
Sloping the soil away from the foundation will remedy a wet basement most of the time. The Family Handyman recommends firmly packing clay soil around the foundation, with at least a 4-in. slope over the first 4 ft. Place 6-mil black plastic over the soil and cover it with landscape rock. Install 4- to 6-ft. gutter extensions to your downspouts to direct water farther away from your foundation.