4. Splash blocks-These plastic decorative items are advertised as being able to disperse water at the bottom of the downspout to limit erosion and protect your foundation. Most experts recommend dispersing water 4′- 8′ away from the foundation to protect it. Some argue that 10′ is the bare minimum. Either way, this $5, 2′ molded plastic is not going to do the job. Personally, I recommend dry wells or other means of dispersing the water. A qualified contractor can offer different methods and costs. Anything is better than a few splash blocks.