HEC-RAS 1D Sediment Transport 1D Sediment Transport User's Manual BSTEM - User's Manual Current: Defining Cross Section Materials PDF Download PDF Download page Defining Cross Section Materials. Current page Include child pages All pages Defining Cross Section Materials To define cross section materials for BSTEM, the user will enter information from the HEC-RAS Sediment Data Editor (bottom figure of link) from the BSTEM tab: Left or Right Bank Material_ 1. Selecting Pre-Defined Default Parameters 2. Select a Single Set of User Defined Material Parameters for a Bank 3. Define Separate Parameters for Multiple Layers for Each Cross Sections ×