Modeling Note: Using Subsidence with Fixed Bed Models
HEC-RAS only includes subsidence in the sediment model. But users sometime want to apply subsidence for fixed-bed hydraulic models. Modelers can apply subsidence to a hydraulic model by creating a "dummy" sediment file with simple, synthetic, sediment data, and then set all the cross sections to Pass Through Nodes (see next section). This will signal that HEC-RAS should adjust cross sections due to subsidence but not erosion or deposition.