This option allows the user to fill in portions of cross sections with sediment. The sediment is assumed to be at a constant elevation in any particular cross section. To use this option select Fixed Sediment Elevations from the Tools menu of the geometric data editor. When this option is selected, a window will appear as shown in Figure 5-88.

Figure 5 88. Fixed Sediment Elevation Editor
As shown in Figure 5-88, the user selects a particular river and reach to work on, then a range of cross sections to apply the sediment fill to. There are three options for having a sediment fill over a range of cross sections. The first option is to enter a sediment elevation at an upstream or downstream cross section then project the sediment fill on a slope over the range of selected cross sections. The second option is to set the upstream and downstream elevations, then allow the program to use linear interpolation for the cross sections in between. The final option is to set the sediment elevation individually on a cross-section by cross-section basis.

The lower left hand portion of the editor is used to set the sediment values over a range of sections. The table on the lower right hand side of the editor shows the actual values that are applied to each cross section. The user can change any value in the table directly, or they can highlight a section of values and use the four buttons above the table to modify the values. These four buttons allow for adding a constant; multiplying the values by a factor; setting all of them to a specific value; or setting them to the cross section invert.