HEC-RAS User's Manual Entering and Editing Geometric Data Viewing and Editing Data through Tables Current: Ineffective Flow Area Elevations PDF Download PDF Download page Ineffective Flow Area Elevations. Current page All pages Ineffective Flow Area Elevations This table allows the user to see the trigger elevations for all of the ineffective flow areas in the model. The user can change any of the elevations directly from this table. ×