Following are extracts from WA Planning documentation showing how a BAL assessment is calculated using AS3959 2018 Method 1.
The following example shows why all classified vegetation 100 metres or greater from a structure is considered LOW risk.
BAL LOW no building modifications required.
The following example shows why a BAL (in this case BAL 29) rating would apply.
BAL 29 building modifications to gain compliance will be required.
The following is a visual guide with an explanation of each BAL rating. Guide refers to AS3959-2009, AS3959 2018 now applies.