Manning's n as a function of depth

[fcernst]

I am wondering if the iterative calculation of Manning's n as a function of flow depth could be incorporated into EPA SWMM as is done in HEC-15 and channel permissible shear design. Blodgett (1986a) and Bathurst (1991).

The first link below is a brief summary and the second link is to the HEC-15 circular.

https://plainwater.com/water/mannings-n-for-riprap-lined-channels/?print=print

https://www.fhwa.dot.gov/engineering/hydraulics/library_arc.cfm?pub_number=15&id=32&CFID=52251044&CFTOKEN=3cee40062955fe3b-F1286C78-0EE7-1D01-E85058B28EEFD252

Thanks,
Fred