Only part of the shear stress water exerts on soils translates into transport. Shear partitioning theory for bed transport is more mature, parsing shear into form and grain shear (and sometimes into other components). This theory is not as applicable to banks. However, the isolated measurements, either by jet tests in the field or SEDFLUME in the lab, tend to isolate grain shear effects. Therefore, the toe scour mechanisms apply a Strickler grain shear correction by default. From the BSTEM Options Editor(see figure in link), from the Grain Shear Correction list, select None, this will turn the correction off. Turning the grain shear correction off will increase the shear stress on the bank and will increase scour.