FLOOD07468

• County: Statewide
• Community: State of Colorado
• Stream Name: All
• Basin: Statewide
• Title: The Design of Encroachments on Floodplains Using Risk Analysis
• Date: 10/1/1980
• Prepared For: USDOT
• Prepared By: Federal Highway Administration
• Floodplain - Doc Type: Educational/Technical/Reference Information

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Even though the cost for loss of life is not included in this analysis,
the user may encounter situations where it would be appropriate to
include this loss. One problem with considering loss of life is arriving
at a reasonable value to use in the analysis. Suggested values vary
considerably. To include loss of life requires adding a cost per death term
to the Accident/Injury Factor part of the accident cost equation:

Accident/Injury Factor = [(Cost Per Death)+(Injury Ratio)(Unit Cost of
Injury)+(Damage Ratio)(Unit Cost of Damage)]

Example: The additional data needed for computing the cost of accidents (no
increased loss of life is assumed) at Row Creek are:

Death Rate
Injury Rato
Damage Ratio
Cost of Injury
Cost of property Damage

Normal Route
4.3
22
250
3000
500

Detour Route
5
22
250
3500
~O

The cost of accidents on the normal route is:

AC -
Q -

(T )(6530)(5)(4.3)
dQ 9 [(22)(3000)+(250)(500)] =
2.4 x 10

(TdQ)(11.2) $/hr

and the cost of accidents on the detour is:

AC =
Q

(T )(6530)(10.3)(5)
dQ 9 [(22)(3500)+(250)(600)] =
2.4 x 10

(TdQ)(31.8) $/hr

The increase cost of accidents due to using the detour are:

ACLQ = (TdQ)(31.8 - 11.2) = (TdQ)(20.6) $/hr

Summation of Traffic-Related Losses

The total traffic-related losses which are input to the economic risk analysis
are computed by the following equation:

TRLQ = TdQ(Running Cost + Lost Time Cost + Accident Cost)

TRL50 = 7(61.2 + 525.7 + 20.6) = 7(607.5) = $4,252

TRL100 = 23.6(607.5) = $14,337

TRL200 = 78.5(607.5) = $47,688

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