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 2 4611 7712
ABN: 11 147 861 292
Version Date: 
2025-11-25
11
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).
STEP 1         DETERMINING CORRECT WIND SPEED

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