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OCR for page 28
CAPTA Components 29
Consequence Threshold
A critical determinant in CAPTA is the capacity of an asset to exceed the threshold consequence
levels determined by the user. Presented in Table 5, and implemented in the CAPTool spreadsheet
model, these consequence thresholds are surrogates and equations used to determine if an asset or
asset category exceeds the threshold and will be included in further analysis as a high-consequence
asset. The equations in Table 5 are derived from information provided in publications from
known sources, such as standards and guidance promulgated by the National Fire Protection
Association (e.g., NFPA 101: Life Safety Code® (8) and NFPA 130: Standard for Fixed Guideway
Transit and Passenger Rail (9)); the applied expert knowledge of practitioners; and available cost data
provided by professional engineers from Parsons Brinckerhoff.
The distinct differentiation between potentially exposed populations (PEP), property, and
mission is highlighted within the equation box. This series of equations is used to determine if
an asset exceeds a threshold requirement and will be considered for countermeasure application.
Table 5. Threshold consequence determination.
Potentially Exposed
Asset Property Equation Mission Equation
Population Equation
Road Bridges Separated into primary $20,000/lf (ADT) (detour length)
direction and secondary 75th, 85th, 95th percentile
direction--for each, if as thresholds relative to
vehicles/lane > 2400, typical bridge inventory
assume 40 vehicles/ (Example is based on the
1000 ft. Otherwise National Bridge Inventory)
assume 7.5 vehicles/
1000 fta
Road Tunnels Separated into primary $100,000/lf User input for criticality
direction and secondary
direction--for each, if
vehicles/lane > 2400,
assume 40 vehicles/
1000 ft. Otherwise
assume 7.5 vehicles/
1000 fta
Transit/Rail 4 (maximum capacity Below ground = critical User input if transfer
Station of rail cars)b station is critical
Transit/Rail 2 (maximum capacity $15,600/lf User input percentage of
Bridge of rail cars)b ridership that regularly use
this transit/rail
transportation asset
Transit/Rail 2 (maximum capacity $40,000/lf User input percentage of
Tunnel of rail cars)b ridership that regularly use
this transit/rail
transportation asset
Administrative & 1 person/175 sq ftc $210/sq ft Never critical unless so
Support Facilities designated by user
Ferries Maximum capacity of User input Never critical unless so
ferry designated by user
Fleets Maximum occupancy of Average cost per Never critical unless so
one fleet vehicle vehicle maximum designated by user
number of vehicles
a
Derived from the Highway Capacity Manual (10).
b
Derived from NFPA 130: Standard for Fixed Guideway Transit and Passenger Rail (9).
c
Derived from NFPA 101: Life Safety Code (8).
