Flow LinesConcrete flow line, or “Swale,” is the most common and important piece of concrete in a parking lot. Flow lines help control water drainage by directing it to catch basins, drain boxes, and curb drains. These control measures help prevent costly damage from standing or running water eroding the asphalt or concrete in a parking lot. First, all existing and new elevations are surveyed to ensure proper drainage with no additional cost to the customer. Next, demolition is completed and the flow line is installed, or replaced, with the appropriate grade and thickness based upon the nature of the project. With years of concrete experience, BCI understands the technical aspects of design, installation, and repair for all varieties of concrete flow line and swale.