Drainage Structures

The drainage structures may be (illustrative images):

Alas
Used in the late collectors.
follows the catalog models DNIT and DNER and may be for circular gallery or rectangular.

You may also choose skew. The other parameters will be calculated or not applicable, why are not editable.

Culverts

Connection structures
Used for connection of secondary branches that come from the pickup boxes for example.

Manhole
Used for connecting primary extensions, changes of direction, or when you need an inspection point on the network.