The manhole feature rules check the number of sections, section elevation and cover elevation values when a manhole is added or modified.
- Compute Number of Sections — For new manholes, calculates the number of incoming and outgoing sections and stores the number in the attributes NR_INPUT_SECTION and NR_OUTPUT_SECTION.
- Compute Section Elevation — Computes some values of the section, its manholes, and their covers. Note:
You must configure the computation of elevation, slope, and heights in the wastewater industry model options. See Set Wastewater Industry Model Options.
To learn more about section elevation, see Wastewater Elevation, Slope, and Height.
- Compute Elevation — The cover height is stored in a Cover Z attribute which is the difference between the soil elevation and the terrain elevation. To learn more about height, see Wastewater Elevation, Slope, and Height.