A trench drain is usually placed on properties that have high land masses. The section of the property where the home or commercial building is located is higher than where the end property meets the road. The ditches or trenches are constructed using large concrete pipes to help carry the accumulating water away. These drains help keep the roads from flooding, which not only makes driving on them hazardous, it also damages to material used to make the road. It is more cost effective for the city to place drainage pipes along the low areas, than to spend the money repairing and resurfacing the damaged roads.