Evidence-faithful public view. UNKNOWN is drawn as an open warm
ring — it must never read as clean.
Observed events are strong evidence (cool); count-only aggregates
and unknown status are warm attention states with distinct shapes.
Itemised events and count-only aggregates are separate populations
and are never summed.
Observability grammar
KNOWN (scoped per fact — never a catch-all)
ZERO_REPORTED (documented 0)
EVENT_OBSERVED (strong evidence, cool)
NOT_PUBLISHED
UNKNOWN — never clean
EXACT_SHARED_IDENTIFIER (gold halo)
Layers
serviced land (sewer)
gravity mains
pressure mains
Events (2024-25, plant-level association)
observed event, volume recorded (ITEMISED_EVENT)
observed event, volume UNKNOWN
count-only aggregate — timing unavailable
Sources & licence
TasWater and the State of Tasmania do not endorse
Crapwatch. Asset data may contain errors or omissions and reflects
available asset knowledge. Non-commercial publication under the
source datasets' Creative Commons Attribution-NonCommercial 3.0
Australia licences.