RAS layers | Description |
Stream Centerline | Used to identify the connectivity of the river network and assign river stations to computation points. |
Cross-Sectional Cut Lines | Used to extract elevation transects from the DEM at specified locations and other cross-sectional properties. |
Bank Lines | Used in conjunction with the cut lines to identify the main channel from overbank areas. |
Flow Path Centerlines | Used to identify the center of mass of flow in the main channel and overbanks to compute the downstream reach lengths between cross sections. |
Land Use | Used to assign flow roughness factors (Manning’s n values) to the cross sections. |
Inline Structures | Used to extract the weir profile from the DEM for inline structures (dams). |