Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. system components
7. [plumbing and stormwater system components]

Anotations

Scope note:

Covered pits into which raw sewage is discharged, the liquid portion seeping or leaching into the surrounding porous soil, and the solids being retained in the pit to undergo partial decomposition before removal.