If using Manning’s n values (N), the n value is specified directly, noting that the Mannings_n value in the 1d_nwk layer becomes a multiplier and should be set to one (1.0). See discussion above for using material values. A value of –1 ignores that section of the profile.
3.13.5.4Position Flag (P)
The position values are used to indicate whether an XZ point is left bank (1), mainstream (2) or right bank (3). Incorporated in Build 2003-03-AA, the P value is used to indicate where the mainstream sub-channel is located. If materials (M flag) are used, the primary material is taken as that at the lowest Z value in the mainstream sub-channel. If the P flag and values are not specified, the primary material is that at the lowest Z value across the whole section.
It is intended that the P values be used for other processing and post-processing of results in future releases.
