A lot of factors impact manning’s n values for 2D modeling, including but not limited to overland surface type and texture, pervious or impervious areas, 2D flow depth. ![]() In HEC-RAS 2D modeling, manning’s n values (Roughness Coefficient) for 2D flow area are normally associated with land cover types and used to account for energy friction losses of overland flow and/or channel flow (if channel flow is also modeled by 2D domain).
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