HEC-RAS 1D Sediment Transport 1D Sediment Transport User's Manual BSTEM - User's Manual Defining Cross Section Materials Current: Left or Right Bank Material_ PDF Download PDF Download page Left or Right Bank Material_. Current page Include child pages All pages Left or Right Bank Material_ HEC-RAS requires at least one set of material properties to be specified for each bank it performs bank failure analysis on. Three levels of detail are available for specifying this parameter including: Selecting Pre-Defined Default ParametersSelect a Single Set of User Defined Material Parameters for a BankDefine Layers of Unique Material at a BankThe material specification approach is bank-specific, so different approaches can be used for different banks within the same model. ×