HEC-RAS 1D Sediment Transport 1D Sediment Transport User's Manual BSTEM - User's Manual Defining Cross Section Configuration Current: Left Bank Edge Station_ PDF Download PDF Download page Left Bank Edge Station_. Current page All pages Left Bank Edge Station_ This should be the inflection point between the bank and the top of the bank. All failure planes considered will intersect the top of bank between the edge of bank and the first cross section station-elevation point. ×