COLUMBUS, Neb. (AP) – A man who fled Columbus eight years ago before sentencing on a drunken-driving charge and prosecution for an assault has been given 18 months for those crimes.     Court records say 51-year-old David Bowerman was given a year for the 2002 DUI and 180 days for the 2003 assault. Bowerman had been convicted of the DUI before fleeing Nebraska. Since his capture last month, he pleaded no contest to the assault.     Bowerman was captured after he got off a train in Holdrege, having traveled from California to help his son move.     A Holdrege officer helped Bowerman at the station on April 15. The officer checked Bowerman with a national crime clearing house and learned that Bowerman was sought in Platte and Dodge counties.