(Portland, OR)  --  TriMet officials say about a dozen of the agency's trains are out of service following Saturday's flooding.  The flood resulted in standing water being left on the Southwest 1st Avenue line under the Morrison Bridge.  Transportation legal consultant Carl Berkowitz told KATU-TV that it was a mistake to send trains through because it posed a hazard to passengers who stood in ankle-deep floodwater.  TriMet officials say safety procedures regarding operating in flood conditions will be reviewed and revised.