Linear structural components in a shaft or structure that are not hydraulically relevant and are not considered in hydraulic calculations (e.g., step, berm, gutter, heat exchanger).

Dry weather overflow pipe, swan-neck. A vertical pipe at the junction of a sewer and a manhole. The pipe allows water to be transported more efficiently and in a controlled manner during dry weather. Although assigned to the manhole in terms of content, it is considered hydraulically as a component of the sewer/line.Its upper elevation is defined as the inlet height into the manhole for correct hydraulic analysis. This asset type is assigned to the manhole node as content. If the linear vertical geometry of the downpipe is recorded for 3D visualization, the asset type Downpipe in the StructureLine feature class should be used instead of this DownpipeEdge.

NarrowingFlowChannelEdge(AssetTypeCode 855) is a type of sewer installation equipment. It's a structural narrowing ofthe sewer channel cross-section to increase flow velocity for dry weather inflow, as defined by VSA.