"No matter how gently rain falls onto your roof, the water builds up as it runs off and creates a powerful surge that, if not diverted, can hammer the ground next to your foundation." Original Source: http://www.bobvila.com/articles/are-gutters-actually-necessary/
The apparently straightforward fixture that runs along the edge of the roof is entrusted with a vital responsibility. Gutters are essential, know how to ensure yours do the best job possible. Gutters are an imperative component of homes’ exteriors and not just some sort of decorative feature. Professionally installed gutters create a clean edge around your home’s roofline and the gutter system on every new house for a job—guiding rain and storm water off the roof and away from the foundation of the house which is essential to the home’s structural well-being. In case your gutters are not fully functioning, and downspouts to control runoff in a safe manner, rainwater could cut pathways through your yard creating ditches, pooling in low-lying areas, and destroying your lawns, flowers, and other vegetation. KEY TAKEAWAYS:
Gutter must be kept clean and free from debris
Clogged gutters can be nearly as bad as having no gutters at all.
If you have traditional gutters on your home, you should clean them at least twice a year.