French drains provide an easy channel for water to flow through. Water runs into a gravel-filled trench, then into perforated pipe at the bottom of the trench. 

 

Water travels freely through the pipe, which empties a safe distance from the house.

 

The trench bottom should be sloped in the direction you want water to flow. Depending on your situation, the water can be diverted to A low-lying area of your property, A drainage ditch, A dry well, the street, etc...