Chapter 3 Cross Section Issues
Cross Section Issues
1. Place additional cross-sections at locations where the model cannot converge on several time
steps. Keep in mind that if the cross sections are placed too close together, the numerical
solution will cause wave steepening and the model will go unstable on the rising limb of the
2.
following situations:
•
versa.
•
versa.
•
3. It is better to use real terrain geometry for constructing additional cross sections rather than
just interpolating cross sections.
4.
structure should also overtop and not be blocked.
5.
Ineffective flow areas should be marked as “permanent” so that during the routing, the
large increase in conveyance area and cause the model solution to oscillate by having an
the next iteration or time step.
6.
conditions.
7.
cross-section invert.
8. Revise the hydraulic parameters for every cross-section and structure to provide additional
conveyance curves can be minimized by adding additional horizontal Manning’s roughness
locations.