MANUAL No - Forest and Wood Products Australia

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Manual No. 8: Termite Attack 75 Equation Section (Next) 8.1 Procedure to compute risk 8 APPLICATION FOR TIMBERLIFE First the Hazard score H is evaluated using Tables 8.1-8.8. Detailed definitions of the hazards have been given in Section 6.3. Then, using these hazard scores, the value of risk(50), the probability of an attack in 50 years is evaluated using the following equation risk(50) = 20 + m*[H – H(20)] (8.1) where risk(50) denotes the probability of a termite attack within 50 years, and H(20) denotes the hazard score total for which risk(50) = 20%. The risk can also be combined with the costs associated with the termite management strategy and the cost of failure, should such a failure occur according to the equation (8.2) given in Section 8.5 Details of the derivation of the procedure, and explanations of the various parameters cited can be found in ―Manual No. 8 Termite Attack‖ by R.H. Leicester, C-H Wang and M.N. Nguyen (April 2008). 8.2 Hazard score components Table 8.1 Hazard score for location Zone Location Zone* Hazard score B 0 C 2 D 4 Table 8.2 Hazard score for age of suburb* Age of suburb Hazard score 70 yrs 4 * Suburb refers to area within which at least 20% of the land is covered by buildings. 75
Manual No. 8: Termite Attack 76 Table 8.3 Hazard score for distance to nearest property boundary Distance to nearest boundary Hazard score >8 m 0 2—8 m 0.5
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MARKET ACCESS PROJECT NUMBER: PN07.
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MANUAL No - Forest and Wood Products Australia

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