E: info@deltapanels.com      Head Office: 731 Boundary Road, Richlands, Qld 4077    +61 7 3271 2170
 W: www.deltapanels.com     Sydney Depot:  11 The Old Northern Road, Narellan, NSW 2567   +61 02 4611 7712
ABN: 11 147 861 292
Version Date: 
08.05.2023
10
STEP 1        DETERMINING CORRECT WIND SPEED
Step 1.2        Terrain Category
Terrain Category
                       1:
Exposed terrain for a 10km radius, no trees, other buildings or 
hills. No limited sized water ways such as, rivers, canals, lakes 
and enclosed bays.
Terrain Category
                1.5: 
Located adjacent to shoaling waves from open water ways such 
as, rivers, canals, lakes and large unenclosed bays on seas and 
oceans, extending greater than 10km in any wind direction.
Terrain Category
                       2:
Open terrain with few trees, surrounding buildings such as surrounding 
buildings such as farmland and cleared subdivisions with trees and 
uncut grass.
Terrain Category                        
                2.5: 
Open terrain, typical of a newly developed outer suburb housing 
estate, with few established trees or surrounding buildings. 
Terrain Category
                        3: 
A suburban backyard environment with numerous closely spaced 
houses. The minimum density of houses and trees (except in 
region C & D) shall be the equivalent to 10 house size obstructions 
per hectare. Where substantial well-established trees shall be 
considered as obstructions (except in region C & D).

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