MANUAL No - Forest and Wood Products Australia

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Manual No. 8: Termite Attack 53 cov(t) 1 0.8 0.6 0.4 0.2 0 factor 0.7 on expert estimates of cov expert opinion model reliability model 0 50 100 150 200 mean(t) [yrs] Figure 5.3. The coefficient of variation for a given value of the mean attack time (The thin lines correspond to the various choices of the type of barrier system used). 53
Manual No. 8: Termite Attack 54 Equation Section (Next) 6.1 Hazard Parameters 6 RISK ASSESSMENT EQUATIONS As indicated, the model makes a quantified risk estimate on each specific house based on a number of parameters related to that house. The input parameters chosen for practical application are as follows: termite hazard zone age of surrounding suburbs distance of house from boundary wood in the garden and under the house type of ground contact for the house environment of vulnerable timber However, for practical application some approximations are introduced. First, each hazard parameter is given a hazard score, depending on whether it is considered to describe a high, medium or low hazard. These hazard scores are denoted by h. They have been derived empirically to fit exact equations. Then for each particular house, the hazard scores are added so as to obtain a hazard score total, denoted by H. The scores for each particular hazard are given in Table 6.1. The classification of a hazard level is denoted by c. The zone classification for hazard h1 is shown in Figure 6.1. The descriptions for hazards h4 – h7 are given in Section 6.3. Once the hazard score has been evaluated for each of the parameters h1 – h7, the hazard score total H is obtained as a summation of these scores as indicated in Table 6.2. Table 6.1. Hazard scores for termite attack c1 Location Zone (1) Hazard score h1 1 B 0 2 C 2 3 D 4 (1) See Figure 6.1; the hazard for zone A is considered to be negligible. 54
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MARKET ACCESS PROJECT NUMBER: PN07.
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MANUAL No - Forest and Wood Products Australia

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