Manhole/structure infiltration line. Infiltration line within a manhole or structure. Can also be used for internal lines in the structure that are hydraulically relevant.
Storage channels are special conduits that allow volume retention. This means that in heavy rain, they can temporarily store some of the water and release it later at a reduced rate. Storage channels are therefore also called rainwater retention channels and are a relief structure. (Sources: Uhrig, Wikipedia)
Flush pipe. Unlike a flushing shaft, it is not a shaft - hydraulically insignificant. For example, with seepage lines around buildings, these are pipes up to the terrain with a small cover. Can also be placed on a canal.
