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task library
built templatetenability-assessmentwith-tool

Visibility Criterion

Calculates smoke visibility from extinction coefficient and an explicit visibility constant, then compares the result with a minimum visibility criterion. The template reports visibility, margin, utilisation, and a numeric criterion flag.

inputs

3 fields

context

2 archetypes

engine

with-tool

outputs

4 scored fields

contract fields

Parameter Map

3 inputs to 4 scored outputs

  • extinction_coefficient_m_inv

    float

    Smoke extinction coefficient

    0.001 to 101/m

  • visibility_constant

    float

    Visibility constant for the target sign or object contrast

    1 to 20-

  • minimum_visibility_m

    float

    Minimum acceptable visibility

    0.1 to 100m
visibility_mtol 0.03

Calculated visibility

visibility_margin_mtol 0.03

Visibility margin above minimum criterion

visibility_utilisation_ratiotol 0.03

Minimum visibility divided by calculated visibility

criterion_satisfiedtol 0.01

Numeric flag where 1 means visibility meets the criterion

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given for an egress route

all fields visible
all_givenmedium

All parameters given across tenability settings

all fields visible
all_givenhard

All parameters given for large volume spaces

all fields visible

scenario bands

Archetype Atlas

egress_route

2 contexts

Egress route smoke visibility check

extinction_coefficient_m_inv0.05 to 2
visibility_constant3 to 10
minimum_visibility_m5 to 15

egress-route / smoke-control-zone

large_volume_space

2 contexts

Large volume space smoke visibility check

extinction_coefficient_m_inv0.02 to 1
visibility_constant3 to 10
minimum_visibility_m10 to 30

atrium / station-concourse

rendered task

Generation Preview

atrium-large-volume-space-preview

difficulty
hard
visibility
all_given
archetype
large_volume_space
site context
atrium
instruction excerptvisibility-criterion_calc.py

visible fields

  • extinction_coefficient_m_inv0.02 to 1 1/m
  • visibility_constant3 to 10 -
  • minimum_visibility_m10 to 30 m

withheld schema

visibility_mvisibility_margin_mvisibility_utilisation_ratiocriterion_satisfied
Large volume space smoke visibility check. atrium. Required outputs: visibility_m, visibility_margin_m, visibility_utilisation_ratio, criterion_satisfied