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actually - i think Dept Mines and Pet have contours on their site but you need to install Silverlight to use it
www.dmp.wa.gov.au/7113.aspx
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As Myf touched on, they're sometimes available as the overlay on intramaps, council dependent. Easiest course of action.
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The slope will be deceptive because it's built up 1m at the rear, so you're 'only' seeing 6m.
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Council contours are Water Corp contours and are reasonably accurate.
